super()

class Person {
 
    public static void prt(String s) {
        System.out.println(s);
    }
 
    Person() {
        prt("A Person.");
    }
 
    Person(String name) {
        prt("A person name is:" + name);
 
    }
}
 
public class Chinese extends Person {
    Chinese() {
        super(); // 调用父类构造函数（1）
        prt("A chinese.");// (4)
    }
 
    Chinese(String name) {
        super(name);// 调用父类具有相同形参的构造函数（2）
        prt("his name is:" + name);
    }
 
    Chinese(String name, int age) {
        this(name);// 调用当前具有相同形参的构造函数（3）
        prt("his age is:" + age);
    }
 
    public static void main(String[] args) {
        Chinese cn = new Chinese();
        cn = new Chinese("kevin");
        cn = new Chinese("kevin", 22);
    }
}