java之this关键字

public class Person{
    String name;
    int age;
    public Person(String name,int age){
        //此时，为了明确形参和成员变量，需要使用this
        this.name = name;
        this.age = age
    }
    public void setName(String name){
        //同样的，在方法中，也需要辨别
        this.name = name;
    }
    public String getName(){
        return this.name;
    }
}

package myjava;

public class Person {
    private String name;
    private int age;
    
    public Person() {}
    
    public Person(int age) {
        this.age = age;
    }
    
    public Person(String name) {
        this();//这个this()实际上调用的是Person()
        this.name = name;
    }
    
    public Person(String name, int age) {
        this(age);//这个this(age)实际上调用的是Person(int age)
        this.name = name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return this.name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public int getAge() {
        return this.age;
    }
}

package myjava;

public class Test {
    public static void main(String[] args) {
        Person p = new Person();
        p.setAge(20);
        p.setName("tom");
        int age = p.getAge();
        String name = p.getName();
        System.out.println("name："+name);
        System.out.println("age："+age);
        
        Person p1 = new Person(10);
        String name1 = p1.getName();
        int age1 = p1.getAge();
        System.out.println("name1："+name1);
        System.out.println("age1："+age1);
        
        Person p2 = new Person("jack");
        String name2 = p2.getName();
        int age2 = p2.getAge();
        System.out.println("name2："+name2);
        System.out.println("age2："+age2);
        
        Person p3 = new Person("bob",30);
        String name3 = p3.getName();
        int age3 = p3.getAge();
        System.out.println("name3："+name3);
        System.out.println("age3："+age3);

    }
}