Java constant - final

gistfile1.java

import java.util.Random;

/**
 * Created by zzt on 1/24/15.
 */
public class Const_java {
    private static Random rand = new Random(47);

    // can be compile-time constants:
    private final int valueOne = 9;
    private static final int VALUE_TWO = 99;
    // typical public constant:
    public static final int VALUE_THREE = 39;
    // can also be run-time constants:
    private final int i4 = rand.nextInt(20);
    static final int INT_5 = rand.nextInt(20);
    // a final reference
    private final String s1 = new String("s1");
    // Arrays:
    private final int[] a = { 1, 2, 3, 4, 5, 6 };


    public static void main(String[] args) {
        Const_java const_java = new Const_java();
        //Const_java.INT_5++;
        // error

        //const_java.s1 = "asd";
        //error

        const_java.s1.concat("asd");

        const_java.a[0] = 1;

        //const_java.a = new int[9];
        //error
    }
} 

Java constant - final

Java constant - final