subtraction program in java

Method #1

class subtraction{  
public static void main(String[] args){  
int a=10;  
int b=10;  
int c=a-b;  
System.out.println(c);  
}}  

       OUTPUT: 20

Method #2

Import java.util.*;
class subtraction{  
public static void main(String[] args){  
Scanner scan= new Scanner (Syetem.in);
System.out.println("Enter 1st number:");
int a=scan.nextInt() ;
System.out.println("Enter 1st number:");
int b=scan.nextInt();  
int c=a-b;  
System.out.println(c);  
}}  

Method #3

Import java.util.*;
class subtraction{  
public static void main(String[] args){  
int a=10;
int b=10;  
 System.out.println(a-b);  
}}  



Method #4  (Using methods)

class Subtraction
public static void main(String[] args) {
int m=12;
int n=10;
int p= Sub(m,n);

System.out.println(p);


}
private static int Sub(int a, int b) {
int Sub=a-b;

return Sub;

}


}