java preferences,Multiple Value initialization and retrieval by put and get method

Multiple Value initialization and retrieval by put and get method

In this example you are going to find out the flow of using put and get method of the preferences. After reading, coding, and running you are able to use the get and put method. Here we are using some extra package method like Arrays, Iterator here you can see that how firstly in program we putting the value of the preferences like int type ,Boolean type, and simple key value after that we are just using the get method we access all the stored value of the preferences. As we recently completed all of the put and get type, some of them are given here for knowing them more clearly.

Here is the code of the Program :


package roseindia;

import java.util.Arrays;

import java.util.Iterator;

import java.util.prefs.Preferences;



public class Basic {

  public static void main(String[] args) throws Exception {

    Basic basic = new Basic();

  }



  public Basic() throws Exception{

    Preferences prefs = Preferences.userNodeForPackage(this.getClass());

    prefs.put("city1", "delhi");

    prefs.putInt("intValue", 2);

    prefs.putBoolean("booleanValue", true);

    int usageCount = prefs.getInt("intValue", 0);

    usageCount++;

    prefs.putInt("UsageCount", usageCount);

    Iterator it = Arrays.asList(prefs.keys()).iterator();

    while (it.hasNext()) {

      String key = it.next().toString();

      System.out.println(key + ": " + prefs.get(key, null));

    }

  }

}

After thoroughly knowing the code you should save the file by "Basic.java" file name and when after compiling the code you run your program you will get the output given below .

Here is the output of the Program :

C:\roseindia>javac Basic.java

C:\roseindia>cd..

C:\>java roseindia.Basic
city1: delhi
intValue: 2
booleanValue: true
UsageCount: 3

C:\>_

In the above Program the City1 and Delhi is putting as the default value and the all of the rest value is putting as the integer , Boolean value and after using the put function we are also use the get function via which we are just take from the contains preferences value for the output.

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