Pass by value vs Pass by reference in JAVA 

Theory:

Java is strictly pass-by-value. In Java, you can't directly pass variables by reference as you would in languages like C/C++. However, you can achieve a similar effect by passing an array or an object reference.

Code:

import java.util.*;

public class MyFirstClass {

    public static void main(String[] args) {

        //Pass by value example in JAVA

        System.out.println("PASS by value example in JAVA");

        int n = 1;

        passByValue(n);

        System.out.println(n); // You can see O/P of n is unmodified by passByValue func

        System.out.println("PASS by reference example in JAVA");

        // Pass by reference example in JAVA

        int num[] = new int[1];

        num[0] = 10;

        doSomething(num); // Passing the array reference

        System.out.println(num[0]); // Print the modified value

    }

    // Pass by value example in JAVA

    public static void passByValue(int num)

    {

        num = num + 10;

        System.out.println(num);

    }

    // Pass by reference example in JAVA

    public static void doSomething(int num[]) {

        num[0] = num[0] + 10;

        System.out.println(num[0]);

    }

}