Java - Swap two numbers
There are two common ways to swap the value of two variables:
- Swap the value of two variables using a temporary variable
- Swap the value of two variables without using temporary variable
Method 1: Swap the value of two variables using a temporary variable
In the example below, the initial value of variables x and y are 10 and 25. A temporary variable called temp is created to store the value of x and then the value of y is assigned to x. Finally, value of temp (which stores values of x) is assigned to variable y. The final value of variables x and y after swap are 25 and 10 respectively.
public class MyClass { static void swap(int x, int y) { System.out.println("Before Swap."); System.out.println("x = " + x); System.out.println("y = " + y); //Swap technique int temp = x; x = y; y = temp; System.out.println("After Swap."); System.out.println("x = " + x); System.out.println("y = " + y); } public static void main(String[] args) { swap(10, 25); } }
The above code will give the following output:
Before Swap. x = 10 y = 25 After Swap. x = 25 y = 10
Method 2: Swap the value of two variables without using temporary variable
+ operator is used to swap the value of two variables. In this method no temporary variable is used. See the example below for syntax.
public class MyClass { static void swap(int x, int y) { System.out.println("Before Swap."); System.out.println("x = " + x); System.out.println("y = " + y); //Swap technique x = x + y; y = x - y; x = x - y; System.out.println("After Swap."); System.out.println("x = " + x); System.out.println("y = " + y); } public static void main(String[] args) { swap(10, 25); } }
The above code will give the following output:
Before Swap. x = 10 y = 25 After Swap. x = 25 y = 10
Similarly, others operators can also be used in this method. Please see the page: Java - Swap two numbers without using Temporary Variable.
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