Java Get Example

In this section of Java Examples, we are going to illustrate various Java Get examples like how to get the date and time, IP Address or memory size etc.. If you are a Java beginner this is a best place for you to learn different methods, functions and class used in Java Language.

Just go through the given examples to get the things fast and practice these code at your end to learn java easily. After going through this section you will be able to retrieve different values whether it is a database size or memory size using Java programming language.

Java Get Examples..

1. Get host name in Java: This example is going to show you how to retrieve the host name of a particular IP address. Just go through the example code to see the use of get method in it.
                  
2. Retrieve Month from Date using Java: Learn how to retrieve the month from given particular date. Example code is given for better learning practice
                
3. IP Address:  This Java Get IP Address example, explains how to retrieve the IP Address of the particular machine.
               
4. Get Memory Size:  With the help of the given Java code you can easily get the available memory size and can print it on command prompt.
              
5. Total Memory Usage: While going through the example, you will learn how to obtain the used memory from the total memory using Java program.
               
6. Use of Get Method in Java: What is method and how to use the get method in Java, this example is going to illustrate you the same thing. Just check the example and run it at your end as well to learn it quickly.
                
7. Mime Type: It is a technique to describing and attaching files to internet mail. But in this example you will see how to get the Java Mime Types.
             
8. Get the Month name: If you want to print the name of the month from the current date, this example is exactly for you.. Go through the code it's very simple and easy to understand.
            
9. Time in Milliseconds: In this code, we have explained how to get the time in milliseconds. Go through the syntax to understand how it works.
            
10. Get Array Size
    To calculate length of the given array we have used length property. It returns the length of the given array.
            
11. Absolute value Java
    Absolute value is the only value of a number regardless of a prefixed plus or minus sign. In the example given below we have used abs() method of class java.lang.Math that returns absolute value  of a given number as argument.
             
12. Date and time code
    In the example given below we will see, how to display current date and time in the user given format. To do all this we have first created instance of the calendar class that returns object of the same class whose time fields have been initialized with the current date and time.
              
13. Java get ASCII value
    To print ascii value of a character this is the the simplest way to change the type a character. Here in the example given below we will select character from a given string and change their type to integer that will be their ascii value.
                                                                
14. Class Directory
    In this section of example we are going to describe you how to fetch the class directory's path by the class name. To get the class directory's name and its path we have used two methods getClass() and getResource() over an object instance.
                                                            
15. Java program to get class name without package
    In this example we are making a simple example which describes you that how you can get the class name without package. 
                                                                              
16. Program to get the color of pixel
    In this java example program we have to write code for getting the pixel color of an image. To get the pixel color we need to first have an image and then we will be able to get the pixel color of any specific or particular pixel in the RGB format.
                                                                                                                                                            
17. Get column names of a table
    In this example of getting the columns names we need to have connection with the database and then after we will get metadata of this table and find the columns name within the metadata.
              
18. Java get Blob
    Blob is known as 'binary large object', is a collection of binary data stored as a single entity in a database management system and can hold variable amount of data.
                            
19. Get Byte Array from File                   
    In this section, we are going to show the array of bytes from the specified file. For this, a file 'Hello.txt' is passed into the constructor of class File.
                                           
20. Calling Class
    In this example we will find the name of the class name.
                          
21. Calling Method
    In this example we will find the name of the method. Provides programmatic access to the stack trace information printed by printStackTrace(). It returns array of StackTraceElement objects.
                          
22. Java get character
    In this example given below, we will learn how to read character from keyboard and display on standard output device.
                           
23. Character from String
    In this example we will see that how to convert string to array of character and retrieve elements from that character array one by one.
                         
24. Classes In Package
    In this section, you will learn how to retrieve all the classes from the package by providing the path of the jar file and the package name.  
                              
25. Get Class Name
    In the example given below we will learn how to get name of the particular class with package name. getName() method returns fully qualified name of the particular class in string format.
                                  
26. Java Get Class Location
    In this section, you will learn how to get the class location. For this, we have used the classes URL and ClassLoader. 
                                
27. Show class path
    In this section, you will learn how to get the class path. The method System.getProperties() determines the current system properties. 
                                  
28. Get Time Stamp
    In the example you will learn how to display current time. getTime() method returns the number of milliseconds represented by Date object that will be used as argument to create object of java.sql.Time class.
                   
29. Java program to get the Command Line Arguments
    In java we can get the command  line arguments as they are provided on the console. In this example program our program takes arguments from the console and print it on the console.
                            
30. Get computer name in java
    We can get the computer name by the java code program. For getting computer name we have used java.net.InetAddress class.
                                  
31. Java Example program to get the current working directory
    This example java program illustrates to get the current working directory (CWD). With the File class object we can get two types of paths in java.
                           
32. Image Size Example
    This Example shows you get the image size. Toolkit class is used to bind the different components to specific native toolkit implementations. 
                    
33. How to get IP Example
    This example shows you ip address of your network interface.
                      
34. Get Image
    This Example shows you get the image.
                       
35. Retrieve IP Address
    This example shows you ip address of your network interface.
                 
36. Print File List in Java
    In this section, you will study how to retrieve all the files and folders from the specified directory. 
                     
37. Code to get Free Space in Java
    In this section, you will study how to obtain available free space in the specified file.
                      
38. How to get File Name
    In this section, you will study how to obtain the name of file. 
                       
39. GMT Time in Java
    In this section, you will study how to obtain the GMT time. GMT stands for Greenwich Mean Time and IST stands for Indian Standard Time. 
                      
40. Java Get Clipboard
    In this section, you will study how to use the method getClipboard().
                  
41. Data type of column field
    In this example java program we have to get the data type of the database table fields.
                     
42. Show current date                 
    In this example program we have to get the current date at present now. We have used Calendar class for getting the current date and time instance.
                  
43. Decimal value                         
    We can also get the decimal value in the specified format as we wish by calling DecimalFormat class. It will format a long value to the specified string pattern.
                      
44. Default Charset
    We can achieve the default charset through the java program. 
                      
45. Default Locale
    Locale object is a representation of geographical, political, or cultural region. We can get and set our default locale through the java programs.
                    
46. Java program to get the desktop path
    In this example program we have to get the desktop path of the system. In the java environment we can get the desktop path also with the system's property.
                 
47. Java program to get domain name by URL
    We can also get the domain name by the java program. Domain name are used to represent the symbolic representation of numerical internet address. 
                       
48. Java example to get Graphics
    In this section you will learn how to use the method getGraphics().
             
49. Java example program to get IP address of own system
    An IP (Internet Protocol) address is a numerical unique identification number which is assigned to the devices participating in the network for communication. To get IP address of our own system in a java program we will be using InetAddress class.
               
50. Java example program to get the operating system's version
    You can check your current system's operating system version by the java code also. For this purpose you have to use the System's property "os.version".
             
51. Java example program to get the operating system name of the system
    Many times we need to know the current operating system name on which we are working. So in java we have "os.name" property which provides us the information about the current operating system name.
            
52. Java example program to get Operating System type or architecture
    In java environment we can write java code which will make us enabled to get the operating system type. We can get the operating system architecture or system type by using the system property.
             

53. Java example program to get the object's ID
    In java there is no any specific method that provides us the object's ID. But each object has its own unique hash value which can be treated as unique Id for that object.

54. Java example to get Object class name at runtime
    In java there is a way that makes us enabled to get the object class name at runtime. It can be done by calling the getClass() method on the class object. Then  by calling the method getName() we can get the name of the object class.

55. Java example program to get extension
    To get the file name and file extension separately we can do the string manipulation on the file name. Suppose "filename.ext" is some filename with extension is provided.

56. Java example to calculate the execution time
    This example program will describe you the way that how one can calculate or get the execution time of a method or program in java. This can be done by subtracting the starting time of the program or method by the ending time of the method.

57. Java example to get the execution path
    We can get the execution path of the system in java by using the system property. For getting execution path we have used "user.dir" property of the system.

58. Java example program to get epoch time of windows
    Epoch is used to compare dates with the some other dates or dates with the other time format mathematically. That's why it is being used through out the whole programming world.

59. Java example program to get the environment variable
    The getenv() method of the java.lang.System provide us the functionality to get the environment variable value. To get the single environment variables value we have to call the getenv("environment variable") method where environment variable is a value that we want to evaluate.

60. Java get Next Day
    In the given example, we have used the class DateFormatSymbols in order to get the names of the days of the week. The method getWeekdays() provide the string of days of week. To get the current day, we have used the Calendar class.

61. Java get yesterday's date
    In the given example, we simply get the current date by using the method dateFormat.format(cal.getTime()).But on subtracting one day from the calendar by using the method cal.add(Calendar.DATE, -1), the method dateFormat.format(cal.getTime()) will displayed the yesterday's date.

62. Java get number of days between dates
    In order to get the number of days between two dates, the given example has set two dates by using the Calendar.set(int year, int month, int date).

63. Java get Year
    In this section, you will learn how to obtain the current year. The Calendar class provides a getInstance()  method that returns a Calendar object.

64. Java get year from date
    In this section you will study how to retrieve the year from the date. You can see in the given example that we have called SimpleDateFormat class showing the format of year.

65. Java get number of Processors
    To display the number of processors available to a current Java Virtual Machine, we have used the method availableProcessors() of class Runtime and the method getRuntime() returns the instance of Runtime class with the java application.

66. Java get Heap Size
    In this section, we are going to illustrates you how to obtain the heap size. The heap is the area in the memory used for memory storage during the runtime of the program.

67. Screen Dimensions
    The Toolkit class has a static method called getDefaultToolkit() and can be used to obtain the default Toolkit object for the user's system, which contains information about the user's specific machine.

68. Number of Days in Month
    This example sets the year as 2008, month as Calendar.FEBRUARY and the date as 1 using the method calendar.set(year, month, date) provided by the class Calendar.

69. Number of rows in result set
    In this section, you will learn how to retrieve the number of rows from the database table. As you know that the data is stored in the database table in the form of row and column.

70. Http Headers in Java
    In this section, we are going to illustrate you how to get the Http Headers. Here, we are using the URL class which points the resource. In order to make a communication link between the application and a URL, we have used the class URLConnection.

71. Filename without Extension
    In this section, you will learn how to obtain the filename without extension. For this, the file name or the directory name is being provided.

72. Java get available Font
    In order to retrieve all the available fonts, we have used the AWT package. The class GraphicsEnvironment describes the collection of all the available GraphicsDevices and Font objects.

73. Find Free Memory
    In this section, we are going to obtain the free memory. In order to get the memory left of being allocated, the method getruntime() returns the runtime object associated with the Java application.

74. Folder Size in Java
    In the given example, we are going to show you the size of specified folder and also the number of files and folders that are presented in the specified folder.

75. XML File
    In this section, you will study how the java application read the XML file. For this, you need to create a XML file.

76. Java get windows Username
    In this section, you will learn how to obtain the window's username. We are providing you an example which will obtain the window's username by using the System.getProperty().

77. Java get Version
    In this section, you will learn how to obtain the java version and the OS version. We are providing you an example which will obtain the java version installed on the system and the OS version by using the System.getProperty().

78. Get User Input
    In this section, you will learn how to get the user input from the command prompt. We are providing you a java application that will communicate with the user at the command line and returns the user input.

79. Java get User Home
    In this section, you will study how to get the user home. We are providing you an example which will obtain the home directory by using the System.getProperty().

80. System TimeZone
    In this section, you will learn how to obtain the System's TimeZone. The Time Zone is basically the uniform standard time usually referred to as the local time.

81. System Properties
    In this section, you will learn how to obtain the system properties. The System class provides a Properties object that describes the configuration of the current working environment of the system.

82. System Locale
    In this section, you will learn how to obtain the locale. We are providing you an example which will obtain the locale of the system by using the System.getProperty(). 

83. Java get Stack Trace as String
    In this section, you will learn how to get the stack trace of an exception as a String. We are providing you an example, which is throwing an IllegalArgumentException using Throwable class.

84. Modify Properties
    In this section, you will learn how to modify the set of system properties by adding a new property. In the example given below, we have create a new property listed in the 'NewProperties.txt' file i.e java.company=Roseindia Pvt Ltd which is not an actual System Property.

85. Node Value
    In this section, you will learn how to obtain the node value. Before any further processing, you need a XML file. For this we have create a employee.xml file. 

86. Get Node Text
    In this section, you will learn how to obtain the text of the node in the specified XML file. For this we have create a 'employee.xml' file. In the given example, we have used XMLInputFactory class in order to get the streams.

87. Java get Stack Trace
    When you want to generate an exception in a program, it will be better to print out the exception stack trace to catch the error instead of using e.getMessage() method.

88. Progress Bar in Java
    Progress Bar is a component used to show the status of the application that how much time is left in order to complete the task of a specified application.

89. Radio Button in Java
    Radio Button is a circular button on web page that can be selected by the user. The AWT  Widget used to create a radio button is Checkbox. The Checkbox class is used by the AWT to create both Radio Button and Checkbox.

90. Menu Bar in Java
    A Menu Bar is a set of option that allow the user to choose from any one of the  saving option. A list of other option component  a user can choose in a menu bar.

91. Java get year from date
    In this section you will study how to retrieve the year from the date. You can see in the given example that we have called SimpleDateFormat class showing the format of year. 

92. Popup Box in JavaScript
    Popup is used to create and show a component to the user, usually available on top of the window component in a particular hierarchy. The Popups have a small life cycle.

93. Illegal start of type
    The Java error illegal start of type occurred in your code when the starting braces of catch block  is not used after the close of try block. 

94. Unreachable statement
    In this Tutorial we want to describe you a code that help you in understanding a unreachable statement. For this we have a class name' unreachable error', Inside the main method  we have a for loop that has a variable integer I.;.

95. Java error stream
    The Java error stream is used to print error that arises during the execution of a program. The execution of program display an output and error to the different stream that allows the user to move them to different pages thereby isolating them.

96. Error reached end of file while parsing
    Java Error reached end of file while parsing  occurred when a programmer do not close the class  braces properly.

97. Error java.lang.nullpointerexception
    NullPointerException  is the exception that occurred when a programmer perform an operation on a object  or calling a method on the object i.e null. This exception is thrown by JVM.We should not handle that exception by try and catch block 

98. Error java.lang.noclassdeffounderror
    The Java.lang. noclassdeffounder occurred in a code when the programmer write a wrong class name on the command prompt during the execution or running of the program.

99. Get Length of Array
    In this Tutorial we want to describe you a code that help you in understanding the java error message. For this we have a class name java error message.

100. Java error log
     Java error log is a error that arises due to internal error. A error logger is simple an object that is used to show an error log message for a specifice system and component used in an application.

101. Java error incompatible types
     Java Error incompatible types occurred when a compiler found a variable and expression whose data type is not compatible to perform an operation on them.

102. Java error identifier excepted
     Java Error Identifier excepted occurred when the programmer do not specify the data type of a variable inside the class definition

103. Java error icon
     JOptionPane's icon support specify icon to which the dialog displays. We can use four standard icon using JOptionPane icons  like question, information, warning, and error).

104. Java error dialog
     A Java dialog box is an independent sub window  that is used to notice a temporary message to the user. The dialog box find its extensive application in image, directory and anything compatible with swing.

105. Java error class interface or enum excepted
     Java Error class interface or enum excepted are the class of java error that occurred when a programmer placed a brace in improper place or braces are not properly closed.

106. Java error code
     Java Error code are the set of error that occurs during the compile-time and Run-time. From java error we have given  you a sample of code that makes you to understand the java error code in a better way.

107. Display a dialog box with Java Error
     In this Tutorial we want to describe you a code that help you in implementation of dialog box with Java Error. For this we have a class name could_not_find_mainclass.Inside the main method we print the "couldnotfoundthemainclass"using System.out.println.

108. Java error cannot find symbol
     The java error cannot find symbol occurred when a Compiler does not recognize a class name.

109. Java get default Charset
     We can achieve the default charset through the java program. In our example java program we have created an object of FileWriter and then we will be using getEncoding() method for getting the default charset of this file writer.

110. Java error reading from file
     Java error reading file are the common error occurred  in java that when the user encounter a corrupt file and show a message to the user reason for the failure.

111. Java error missing return statement
     Java error missing return statement are those error in Java that occurred when a programmer forget to write a return statement inside the conditional clauses. method with a non-void return provides you an object of the specific type.

112. Get Current Thread
     A Thread is the independent path of execution in a program. Many thread runs concurrently with a program. Some threads are Multithread, This thread refers to two or more thread running simultaneously within a program.

113. Java error class
     Java error class  is  subclass of throw able class. This mean the application does not able to catch the error occurred in the try block. These error occurred due to abnormal condition.

114. Java error cannot read
     The Java error cannot read occurred when a programmer do not follow the following condition.

115. Get Thread Name
     Thread is the independent path of execution of a thread in a program. The JVM provides an  application to execute the multiple thread running concurrently in an application.

116. Get Length of Array
     Array is defined as data of similar data type. It is defined as data storage method to store information. A array is  considered as a group of  object with the common attribute.

117. Java Get Last Line of File
     In This Tutorial we want to describe you a code that helps you in understanding Get Last Line of File in Java . For this we have a class name "Get Last Line of File".

118. Get Java Version
     The Java has a lot changes since JDK1.0 as well as numerous additions of classes and packages. In addition to this class and package ,Java introduced class standard libraries.

119. Get File Size
     In this Tutorial, we want to describe you a code that helps you in understanding  Get File Size.

120. Show random number
     Random Number is the set of unordered arranged number. The class  Random is derived from java.util.Random.An instance of Random  class is used to provide you a stream of pseudorandom number.

121. Fetch Property by Name
     In this Tutorial we want to describe you a code that helps you in understanding to get Property by Name. For this we have a class name "Get Property By Name".

122. Show current directory
     In this Tutorial we want to describe you a code that helps you in understanding Get Current Directory. For this we have a class name CurrentDir, Inside the main method we create an instance file1 and file2 of file class by using new operator.

123. Current time in Java
     Format is an abstract class that is used for formatting local-sensitive information like  date, number and message. The Format class derived from the package  java.text.format. 

124. Java get time zone
     Time Zone class inherits from a Java.util.time zone. This class represents a time zone offset. The Time zone gives you a specific time zone of a specific locale where the program is running.

125. Java get time and date
     The Class  Date provides you  a specific instant in time( millisecond) precision. This class enabled you to interprets  allowed  dates as year, month, day, hour, minute, and second values and date formatting and parsing of date string.

126. System IP address
     The System IP address is a unique numerical identification assigned to a different system involved in the network for communication. The Format for a IP address is a 32- bit numeric address written as four number separated by periods i.e 192.168.1.1 is an example of IP address.

127. Tomorrow date
     In this Tutorial we want to describe you a code that help you  in understanding Get Tomorrow Date. For this we have a class name GetTomorrowDate.Inside the main method we have a variable name string s,Date date, Format formatter.

128. Last day of the month
     Calendar class inherits from Java.util.calendar.Calendar is  base abstract class, that is used for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR.. A Date object  specific instant in time with millisecond.

129. Get Month Name
     In this Example we want to describe you a code that help you in understanding a how to get a 'Get Month Name Example'.For this we have a class name 'GetMonthNameExample'.

130. Input From Console
     The Console Class inherits from Java.io.console and implements flushable interface. The Input from Console is used to access the character -based console device associated with the current Java virtual machine.

131. Get local host name
     In this Example we want to describe you a code that helps you in understanding a code how to 'Get Local Host Name'. For this we have a class name GetLocalHostName.

132. Java binary to decimal
     In this Tutorial we want to describe you a code that help you in understanding a how to get a 'Java binary to decimal'.

133. Get int from string
     In this section, you will study how to obtain the integer value from String. For this, we have defined a string. The method  Integer.parseInt(st) converts the string into the integer.

134. Absolute Path information is required
     In this section, you will study how to obtain the absolute path of a particular file. For this, we have define a file 'MainClass.java'. The method file.getAbsolutePath() returns the absolute path of the given file.

135. Elapsed Time in java
     In this section, you will study how to obtain the elapsed time. As you all know that the Elapsed time is the time taken to complete the process. In the given example, we have used the method System.nanoTime() to get the start time and the end time of the defined process.

136. Get File Type
     This section illustrates you how to get the file type. In the given example, we have create an instance of the class File and passed the file 'Hello.txt' to the constructor of this class.

137. File Timestamp
     The following example shows the modification date and time of the specified file. The class Runtime provides the runtime environment. The class BufferedReader reads the file from the console and the method runtime.exec("cmd/c dir" +fname) executes the process.

138. Array map in JavaScript
     In this Tutorial we want to describe you a code that help you in understanding JavaScript array map. For this we are using a JavaScript language as script language.

139. Clone in java example
     Java clone method is used to present the duplication of object in the Java programming language. The Java  objects  are manipulated through reference variables, we don't have any way to copy an object in java.

140. Java binary tree insert
     The Binary Tree insert is specialized use of binary tree. The concept lies behind is that all the element value less than the root node value insert left to the root node and the element value greater than the root node insert right to this root node.

141. Binary tree coding
     Binary Tree are the specialized tree that has two possible branches i.e left and right branch. These tree are useful when you build a parse of tree especially in mathematics and Boolean.

142. Use of Local Inner class
     The Java language enables you to define a class inside another class. Such a class is defined as Nested Class or Local Inner class.