How to swap two variable without using temporary variable in java?

Swap two integer variable a and b without using any temporary variable.

Set the initial value for two variable and then swap the value from a to b and b to a. Below is the code snippet written in Java programming to swap two variable without using third variable.

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package jorvee; public class SwapTwoIntegerVariableWithoutUsingTheThirdVariable { public static void main(String[] args) { int a=5, b=3; System.out.println("Before swap value of a: "+a +" and value of b: "+b); a = a*b; b = a/b; a = a/b; System.out.println("After swap value of a: "+a +" and value of b: "+b); } }

Output:

Before swap value of a: 5 and value of b: 3
After swap value of a: 3 and value of b: 5

Another approach to do the same. Swap two variable without using third variable

How to swap two Integer variables without using the third variable?

Swap two integer variable a and b without using any temporary variable.

Set the initial value for two variable and then swap the value from a to b and b to a. Below is the code snippet written in Java programming to swap two variable without using third variable.

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package jorvee; public class SwapTwoIntegerVariableWithoutUsingTheThirdVariable { public static void main(String[] args) { int a=5, b=3; System.out.println("Before swap value of a: "+a +" and value of b: "+b); a = a+b; b = a-b; a = a-b; System.out.println("After swap value of a: "+a +" and value of b: "+b); } }

Output:

Before swap value of a: 5 and value of b: 3
After swap value of a: 3 and value of b: 5

Another approach to do the same. Swap two variable without using third variable 

regex to match only number with n digit

^[0-9]*$

import java.util.regex.Matcher; import java.util.regex.Pattern; final String regex = "^[0-9]*$"; final String string = "12333\n" + "sgd123\n" + "sefgwer46546\n" + "486464se\n" + "486464545656"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println( System.out.println( System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println( System.out.println( System.out.println("Group " + i + ": " + matcher.group(i)); }  }  } }