//package LearnPackage; //-- This file will include compile errors!! Because the IDE does not know which package it is
//public class Demo {
//    void aMetthod() {
//        c1 o = new c1();
//
//        o.x1 = 1;
//        o.x2 = 99;
//
//        o.m1();
//        o.m2();
//    }
//}