package oop.demo03; //類 private:私有 public class Student {private String name ;private int age;private char sex;//提供一些可以操作這個屬性的方法//提供一些public的get、set方法//get獲得這個數(shù)據(jù)public String getName(){return this.name;}//set 給這個數(shù)據(jù)設(shè)置值public void setName(String name){this.name = name;}public int getAge() {return this.age;}public void setAge(int age) {if(age>120 || age < 0){this.age = 3;}else{this.age = age ;}} } //測試 /* Student s1 = new Student();s1.setName("hanhan");System.out.println(s1.getName());s1.setAge(-1);System.out.println(s1.getAge()); * */ package oop.demo04; //繼承 public class Person {protected String name;private int money = 10_000_1000;public void say(){System.out.println("說了一句話");}public int getMoney(){return money;}public void setMoney(int money) {this.money = money;}protected void print() {} } //測試 /* Person person = new Person();person.say();person.setMoney(1000);System.out.println(person.getMoney());*/ package oop.demo05;public class Person {protected String name = "zs";}package oop.demo05;//import oop.demo04.Person;public class Student extends Person {private String name = "lisi";public void test (String name){System.out.println(name);System.out.println(this.name);System.out.println(super.name);}}package oop.demo05;public class Application {public static void main(String[] args) {Student student = new Student();student.test("xiaobai");} } package oop.demo06;public class A extends B{@Overridepublic void test() {super.test();} }package oop.demo06;public class B {public void test(){System.out.println("B==>test");} }package oop.demo06;public class Application {public static void main(String[] args) {A a = new A();a.test();B b = new A();b.test();} } package oop.demo07;public class Person {public void run(){} }package oop.demo07;public class Student extends Person {public void run(){}; }package oop.demo07;public class Application {public static void main(String[] args) {Person p = new Student();p.run();} }

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