Java Multi Dimensions Array - Java Tutorials

Java Multi Dimensions Array - Java Tutorials

Java Multi Dimensions Array - Java Tutorials

Multidimensional Arrays in Java

In java, the grouping of same type of elements for storing under the same name is done using array.An array can hold any type of data and can have multidimensional. For accessing elements of array we use its index.

In other words, we can say that array is the set of same type of data stored under the same roof.

Given below the example to provide you an idea-how array works?

Declaring one dimension array 

type var-name[ ];

For example :

int[] Dev ;

or , you can also declare it as follows :

int Dev[];

If an array is declared as : int Dev[3], it means it has 4 element from Dev[0] to Dev[3].

Allocating memory to arrays :

var-name = new type[size];  

Example :

Dev = new int[12];

Assigning and accessing value from array

You can assign value directly, like this :

Dev[0] = 12; // this will assign value to first element.
Dev[1] = 30  // this will assign value to second element.

Array can also be assigned when they are declared as :

int Dev[] = {3, 12, 21, 30, 39, 48};

You can access array element like this :

System.out.println(Dev[3]);   // This will print 4th element of array.

Example :

public class DevArray {
public static void main(String[] args) {
double[] devList = {1.9, 2.9, 3.4, 3.5};

// Print all the array elements
for (double element: devList) {
System.out.println(element);
}
}
}

Output :

C:\Program Files\Java\jdk1.6.0_18\bin>javac DevArray .java

C:\Program Files\Java\jdk1.6.0_18\bin>java DevArray
1.9
2.9
3.4
3.5

Multidimensional array :

In java, multidimensional arrays are actually arrays of arrays. For example, you can declare a two dimensional array as :

int twoD[][]=new int [4][5];

You can also declare a three dimensional array as :

int threeD[][][]= new int [3][4][5];

Example :

Class TwoDmatrix{
  public static void main(String args[]) {
    int twoDm[][]= new int[4][5];
    int i,j,k=0;

    for(i=0;i<4;i++)
      for(j=0;j<5;j++) {
         twoDm[i][j]=k;
         k++;
      }
    for(i=0;i<4;i++)
      for(j=0;j<5;j++) {
         System.out.println(twoDm[i][j]+"")
         System.out.println();
      }
   }
 }
 

Output :

C:\Program Files\Java\jdk1.6.0_18\bin>javac TwoDmatrix .java

C:\Program Files\Java\jdk1.6.0_18\bin>java TwoDmatrix
0  1  2  3  4
5  6  7  8  9
10 11 12 13 14
15 16 17 18 19

Tutorials

  1. Assertion in java
  2. Anonymous Inner Classes - Anonymous Inner Classes tutorial
  3. Appending Strings - Java Tutorials
  4. Assertion in Java
  5. Autoboxing unboxing in Java - Java Tutorials
  6. Thread Deadlocks - Java Tutorials
  7. BASIC Java - Java Tutorials
  8. Interthread Communication in Java
  9. boolean comparisons - tutorial
  10. Catching Exceptions in GUI Code - Java Tutorials
  11. Exception in Java - Java Tutorials
  12. Causing Deadlocks in Swing Code
  13. Class names don't identify a class - Java Tutorials
  14. Commenting out your code - Java Tutorials
  15. Java Deadlocks - Java Deadlocks Tutorials, Deadlocks in Java
  16. Disassembling Java Classes - Java Tutorials
  17. Double-checked locking,java tutorials,java tutorial
  18. Exceptional Constructors - Java Tutorials
  19. Final Methods - Java Tutorials
  20. garbage collection in java
  21. Java - JDK Tutorials
  22. J2EE Singleton Pattern - Design Pattern Tutorials
  23. Java Comments - Java Tutorials
  24. Java Field Initialisation - Java Tutorials
  25. Java HashSet  - Java Tutorials
  26. Java Multi Dimensions Array - Java Tutorials
  27. java awt package tutorial
  28. Java GC
  29. Java HashMap - Java Tutorials
  30. JDK 1.4 the NullPointerException - Java Tutorials
  31. HashMap and HashCode
  32. LinkedHashMap - Java Tutorials
  33. Which is Faster - LinkedList or ArrayList?
  34. Making Enumerations Iterable - JDK 5 Example
  35. Making Exceptions Unchecked - java tutorial,java tutorials
  36. Creation Time Comparison of Multi Dimensional Array- Java Tutorials
  37. Multicasting in Java - java tutorials,tutorial
  38. Non-virtual Methods in Java - java tutorials
  39. Orientating Components Right to Left,java newsletter,java,tutorial
  40. The link to the outer class,java tutorial,java tutorials