Code :
import java.util.Scanner;
class Swapping_without_third {
 public static void main (String args[])
 {
  int FirstNumber, SecondNumber;
  Scanner sobject=new Scanner(System.in);
  System.out.println("Enter Two Numbers: ");
  FirstNumber = sobject.nextInt();
  SecondNumber = sobject.nextInt();
  System.out.println("Before swapping Method: \n FirstNumber = "+FirstNumber +"\n SecondNumber = "+SecondNumber);
  FirstNumber = FirstNumber+SecondNumber;   //10+20=30
  SecondNumber = FirstNumber-SecondNumber;  //30-20=10
  FirstNumber = FirstNumber-SecondNumber;   //30-10=20
  System.out.println("After swapping Method: \n FirstNumber = "+FirstNumber +"\n SecondNumber = "+SecondNumber);  
 }
}

Output :
Enter Two Numbers:
10
20
Before swapping Method:
 FirstNumber = 10
 SecondNumber = 20
After swapping Method:
 FirstNumber = 20
 SecondNumber = 10

IDE Used To Test This Code : Dr Java

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