Feb 20, 2012 · Java does not have "call by reference". Yes and no. Java never passes by reference, and your way is one workaround. But yet you create a class just to swap two integers. Instead, you can create an int wrapper and use pass it, this way the integer may be separated when not needed: public int value; int temp = a.value; a.value = b.value;

Jul 28, 2012 · String t = a[0]; a[0] = a[1]; a[1] = t; } This works, because array is mutable (i.e. changes can be made to its state), and because a reference to the original object is passed to the function being called (by value). When swap modifies the content of its a, the content of a in the caller gets modified too, because it is the same object.

Jul 18, 2021 · Real pass-by-reference is impossible in Java. Java passes everything by value, including references. But you can simulate it with container Objects. Use any of these as a method parameter: And if you change its contents in a method, the changed contents will be available to the calling context.

Oct 17, 2022 · Swap two numbers in java: There are some ways to achieve pass by reference in java in the place of the call by reference: 1. Make a particular variable of a particular datatype as a class member.

Sep 30, 2024 · Here's a Java program to show internal working - This is simplest way to swap the numbers without using any 3rd variable also swap the numbers in single line.

Learn the differences between Call by Value and Call by Reference in Java. Understand how these concepts affect variable passing and memory management.

Jan 28, 2022 · Functions can be summoned in two ways: Call by Value and Call by Reference. Call by Value method parameters values are copied to another variable and then the copied object is passed, that's why it's called pass by value where actual value does not change.

Mar 22, 2025 · Java supports call by reference for primitives and call by value for objects. Explanation: Java uses call by value for both primitives and objects. For objects, the value of the reference to the object is passed, which allows methods to modify the object's state. There is only call by value in java, not call by reference.

BTW: if your data happens to be a List, a better way to swap is to use Collections.swap(List, int, int): Swaps the elements at the specified positions in the specified list.

import java.io.*; class swap { int i, j; /* Constructor */ swap (int a, int b) { int c; /* Swapping Values */ c = a; a = b; b = c; i = a; j = b; } } class callbyref { public static void main (String args [ ]) { int x = Integer.parseInt (args [0]); int y = Integer.parseInt (args [1]); swap swp = new swap (x, y); System.out.println ("Before ...