java class and objects program
program:-1 Syntex of class public class class_name { //field; //method; } 2.java program to how to define a class and fields. class Demo { int id ; String name ; public static void main ( String args []){ Demo s1 = new Demo (); System . out . println ( s1 . id ); System . out . println ( s1 . name ); } } //output //0 //null 3.java program to demonstrat...