沈阳网站制作找网势科技/最近三天的新闻热点

1，this关键字特点

• 代表当前对象的引用， 谁来调用我，我就代表谁。

• java中就近原则。用来区分成员变量和局部变量重名

2，this的应用场景

      this 代表当前对象的引用。谁来调用我，我就代表谁。

      java中就近原则。用来区分成员变量和局部变量重名

class Demo1_This {public static void main(String[] args) {Person p1 = new Person();p1.setName("张三");p1.setAge(23);System.out.println(p1.getName() + "..." + p1.getAge());Person p2 = new Person();p2.setName("李四");p2.setAge(24);System.out.println(p2.getName() + "..." + p2.getAge());}}class Person {private String name;            //姓名private int age;                //年龄public void setAge(int age) {        //设置年龄if (age > 0 && age < 200) {this.age = age;//System.out.println(age);}else {System.out.println("请回火星吧,地球不适合你");}}public int getAge() {            //获取年龄return age;}public void setName(String name) {    //设置姓名this.name = name;//System.out.println(name);}public String getName() {return name;}}

3，案例

class Demo2_Phone {public static void main(String[] args) {Phone p1 = new Phone();p1.setBrand("三星");p1.setPrice(5288);System.out.println(p1.getBrand() + "..." + p1.getPrice());p1.call();p1.sendMessage();p1.playGame();Phone p3 = new Phone();p3.print();}}/*手机类属性:品牌brand,价格price行为:打电话call,发短信sendMessage,玩游戏,playGame*/class Phone {                                //java beanprivate String brand;                    //品牌private int price;                        //价格int num;public void setBrand(String brand) {    //设置品牌this.brand = brand;//p1.brand = 三星;}public String getBrand() {                //获取品牌return this.brand;                    //this.可以省略,你不加系统会默认给你加}public void setPrice(int price) {        //设置价格this.price = price;}public int getPrice() {                    //获取价格return price;}public void call() {                    //打电话System.out.println("打电话");}public void sendMessage() {                //发短信System.out.println("发短信");}public void playGame() {                //玩游戏System.out.println("玩游戏");}public void print(){int num = 20;System.out.println(num);        // 就近原则System.out.println(this.num);}}