//method-1

public class Subtract1{
 
    public static void main (String[] args){
     
        int num1 = 30;
        int num2 = 15;
     
        System.out.println ("First number : "+num1);
        System.out.println("Second number : "+num2);
     
        //compute subtraction
        int subtract = num1 - num2;
     
        System.out.println ("\nSubtraction of "+num1+" and "+num2+" is : "+subtract);
    }
}

Save this program as 'Subtract1.java'
Compile: $javac Subtract1.java
Execute: $java Subtract1

Output:

First number : 30
Second number : 15


Subtraction of 30 and 15 is : 15

//method-2: Using Class and Object

public class Subtract2{
 
    public static void main(String[] args){
     
        //creating new object
        Example obj = new Example();
        //calling methods
        obj.m1();
        obj.m2();
    }
}

class Example{
 
    int num1 = 50;
    int num2 = 17;
 
    //creating methods
    void m1(){
     
        System.out.println ("First number : "+num1);
        System.out.println ("Second number : "+num2);
    }
 
    void m2(){
     
        //compute subtraction
        int subtract = num1 - num2;
     
        //printing result
        System.out.println ("\nSubtraction of "+num1+" and "+num2+" is : "+subtract);
    }
}


Save this program as 'Subtract2.java'
Compile: $javac Subtract2.java
Execute: $java Subtract2

Output:

 First number : 50
Second number : 17


Subtraction of 50 and 17 is : 33