swap two numbers java

1import java.util.Scanner;
2// java swap function
3public class SwapTwoNumberDemo 
4{
5   int numOne, numTwo;
6   public void swapNum(SwapTwoNumberDemo stn)
7   {
8      int temp;
9      temp = stn.numOne;
10      stn.numOne = stn.numTwo;
11      stn.numTwo = temp;
12   }
13   public static void main(String[] args) 
14   {
15      SwapTwoNumberDemo obj = new SwapTwoNumberDemo();
16      try
17      {
18         Scanner sc = new Scanner(System.in);             
19         System.out.println("First number : ");
20         obj.numOne = sc.nextInt();
21         System.out.println("Second number : ");
22         obj.numTwo = sc.nextInt();
23         obj.swapNum(obj);
24         System.out.println("After swapping - numOne : " + obj.numOne + ", numTwo : " + obj.numTwo);
25         sc.close();
26      }
27      catch(Exception ex)
28      {
29         System.out.println("Exception: " + ex.toString());
30      }
31   }
32}

1int a, b, c;
2a = 5;
3b = 3;
4System.out.println("Before SWAP a = " + a + ", b = " + b);
5c = a;
6a = b;
7b = c;
8System.out.println("After SWAP a = " + a + ", b = " + b);

1int a = 5;
2int b = 6;
3
4int temp = a;
5a = b;
6b = temp;
7
8// now a is 6 and b is 5.
9