This Java code attempts to swap two integer variables by...

This Java code attempts to swap two integer variables by using a swap method, but it does not succeed due to how Java handles argument passing. Let's break it down:

Step-by-Step Explanation

1. Class Declaration: The class Swap is declared. This class contains:

   • A static method swap designed to swap two integers.
   • A main method for execution.

2. swap Method:

   public static void swap(int a, int b)
   {
       int tmp = a;
       a = b;
       b = tmp;
   }
   

   • This method takes two integer parameters (a and b).
   • It swaps their values using a temporary variable (tmp).
   • However, the changes to a and b are local to this method because Java is pass-by-value. This means the method operates on copies of the values passed as arguments, not the original variables in the main method.

3. main Method:

   public static void main(String[]args)
   {
       int a = 3;
       int b = 7;
       swap(a, b);
       System.out.print1n(a);
       System.out.print1n(b);
   }
   

   • Two integers a and b are declared and initialized to 3 and 7, respectively.
   • The swap method is called with a and b as arguments. As explained, this call does not successfully swap their values because Java does not allow actual modification of the original variables from within the method.
   • It then tries to print the values of a and b with System.out.print1n.

Issues in the Code:

1. Method Does Not Swap Values: The swap method doesn't alter the original variables declared in the main method due to Java's pass-by-value semantics.

2. Typographical Errors:

   • The print statements use System.out.print1n instead of System.out.println, which is a syntax error.

After Fixing the Syntax Errors:

Assuming System.out.print1n is corrected to System.out.println, the output of the modified code would still be:

3
7

Because the swap method doesn’t impact the original variables in main.

Key Takeaway:

The code demonstrates an unsuccessful attempt to swap two variables due to Java’s pass-by-value nature. To achieve swapping in Java, you would need to:

• Use a wrapper class (e.g., AtomicInteger, Integer objects via references).
• Return swapped values from the method and reassign them to the variables.