Home Java Example Java Util Getting and Setting Java Type Values in a Preference

Getting and Setting Java Type Values in a Preference
Posted on: January 7, 2009 at 12:00 AM

As you know that a preference node holds only string values. Therefore the Preferences class provides some convenient methods to convert the Java types into string.

Getting and Setting Java Type Values in a Preference

This section demonstrates you to set and get the Java Type values in a Preference.

As you know that a preference node holds only string values. Therefore the Preferences class provides some convenient methods to convert the Java types into string. For example, the method prefs.putBoolean("Boolean", true) converts a Boolean value into a string and then saves the string value and the method prefs.putBoolean("Boolean", true) converts the string back into the Boolean value. Similarly the other Java types are converted into the string. You can see in the given example that we have used the conversion methods for Boolean, int, long, float, double. To specify all these Java Types in the Preference tree, we have define a node 'Java Types'.

Here is the code of JavaTypes.java


import java.util.prefs.*;

import java.io.*;

public class JavaTypes{

public static void main(String []args){



 Preferences prefs = Preferences.userRoot().node("/Java Types");

 prefs.put("String", "Hello");  

 prefs.putBoolean("Boolean", true); 

 prefs.putInt("Integer", 1);  

 prefs.putLong("Long", 123456L); 

 prefs.putFloat("Float", 12.3F);  

 prefs.putDouble("Double", 12.3); 

 

 String s = prefs.get("String", "Hello"); 

 boolean b = prefs.getBoolean("Boolean", true); 

 int i = prefs.getInt("Integer", 1);  

 long l = prefs.getLong("Long", 123456L); 

 float f = prefs.getFloat("Float", 12.5F);  

 double d = prefs.getDouble("Double", 12.5);  



System.out.println(s+" = is of String type");

System.out.println(b+" = is of Boolean type");

System.out.println(i+" = is of Integer type");

System.out.println(l+" = is of Long type");

System.out.println(f+" = is of Float type");

System.out.println(d+" = is of Double type");

}

}

Output will be displayed as:

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