this关键字的使用注意

public class Student { 
    String name;//成员变量name
    int age;
    public Student() {
        System.out.println("这是无参构造方法....");
    }
    public Student(String name,int age) {
      //调用无参构造方法
        this();
        this.name = name;
        this.age=age;
    }
    public void Name(){
        System.out.println("姓名：" + name);
    }
    public void Age(){
        System.out.println("年龄：" + age);
    }
    public static void main(String[] args) {
        Student student = new Student("张三",18);
        student.Name();
        student.Age();
    }
}

public class Student { 
    String name;//成员变量name
    int age;
     public Student(int age) {
      //调用无参构造方法
         this.name = name;
        this.age=age;
    }
        public static void main(String[] args) {
        Student student = new Student(18);
        System.out.println(student.age);
    }
}