public  void method3( int i){
    if (i == 10)  
        System.out.println("i is 10");  
    else if (i == 15) 
        System.out.println("i is 15"); 
    else if (i == 20)  
        System.out.println("i is 20");  
    else
             System.out.println("i is not present");  
}