详解Java中super的几种用法并与this的区别

Base() {

System.out.println("Base");

}

}

public class Checket extends Base {

Checket() {

super();//调用父类的构造方法，一定要放在方法的首个语句

System.out.println("Checket");

}

public static void main(String argv[]) {

Checket c = new Checket();

}

}

String name;

void value() {

name = "China";

}

}

class City extends Country {

String name;

void value() {

name = "Hefei";

super.value();//不调用此方法时，super.name返回的是父类的成员变量的值null

System.out.println(name);

System.out.println(super.name);

}

public static void main(String[] args) {

City c=new City();

c.value();

}

}

String name="xianfan";

String value(String name) {

name = "China";

return name;

}

}

class City extends Country {

String name;

String value(String name) {

name = "Hefei";

super.value("失败");//不调用此方法时，super.name返回的是父类的成员变量的值null

System.out.println(name);

System.out.println(super.name);

return name;

}

public static void main(String[] args) {

City c=new City();

c.value("成功");

}

}

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);

}

}