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Swap Two Numbers in Java

Swap the values of two variables using a temporary variable.

BeginnerModule 1: Basic Java ProgramsExample 3 of 20

swap-two-numbers.java

1public class Main {
2    public static void main(String[] args) {
3        int a = 5;
4        int b = 10;
5
6        System.out.println("Before swap: a = " + a + ", b = " + b);
7
8        int temp = a;
9        a = b;
10        b = temp;
11
12        System.out.println("After swap: a = " + a + ", b = " + b);
13    }
14}

Output

Before swap: a = 5, b = 10
After swap: a = 10, b = 5

What's going on

temp = a, a = b, b = temp. Miss a step and both hold the same value.

Java has no a, b = b, a. People coming from Python look for it. It is not here.

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