Question

Write a Java swap method that could swap values of two integer variables. Do not use any predefined method. Also write a method call that swaps the values of the following two variables.

int first = 7, second = 5;

Answer 1

import java.util.*;

public class Main {
int x,y;
public static void main(String[] args) throws Exception {
  
Scanner sc = new Scanner(System.in);
Main m=new Main();
System.out.println("Enter the value of two number");  
m.x = sc.nextInt();  
m.y = sc.nextInt();  
System.out.println("first and second number are before swap: "+m.x +" "+ m.y);  
swap(m);

System.out.println("After swap: "+m.x +" " + m.y);  
  
}
public static void swap(Main m){
int t=m.x;
m.x=m.y;
m.y=t;
}
}

//Main is class name and m is its object