Package Ctgu.java.java;public class Person {private string name;private int age;public string getName () {return name;} public void SetName (String name) {this.name = name;} public int getage () {return age;} public void Setage (int.) {this.age = age;} public void Eat () {System.out.println ("eat");} public void Walk () {System.out.println ("Walk");}}
package ctgu.java.java;public class student extends person {//private String name;//private int age;private string schoolname; public student () {} Public student (string name, int age) {//this.name = name ;//this.age = age ;this.setname (name); This.setage (age);} Public string getname () {//return name;//}//public void setname (String Name) {//this.name = name;//}//public int getage () {//return age;//}// Public void setage (Int age) {//this.age = age;//}////public void eat () {//system.out.println ("eat");//}//public void walk () {//system.out.println ("Walk");//}public void info () {eat (); System.out.println ("I am a Student");}} package ctgu.java.java;public class worker extends person{public static Void main (String[] args)   {student s = new student (); S.eat (); Worker w = new worker (); W.eat ();}}
Package Ctgu.java.java;public class Graduate extends Student {public void Show () {System.out.println ("I am a graduate student");}
Package Ctgu.java.java;public class Testextends {public static void main (string[] args) {Student s = new Student (); S.eat () ; Worker W = new Worker (); W.eat (); Person p = new person ();p. Eat (); S.setage (); S.setname ("Li"); System.out.println (S.getname () + ":" + s.getage ()); Graduate G = new Graduate (); G.eat (); G.info (); G.show ();}}
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