super()和this()类似,区别是,super()从子类中调用父类的构造方法,this()在同一类内调用其它方法
demo
‘’'java
//superclass
public class Person {
Person() {
System.out.println("Superclass: constrcutor without parameters ");
}
Person(String name) {
System.out.println("Superclass: constructor with name = " + name);
}
public void prt(String str) {
System.out.println(str);
}
}
//subclass
public class Chinese extends Person {
Chinese() {
super();
prt(" subclass: without para");
}
Chinese(String name){
super();
prt("sunclass: with para1: " + name);
}
Chinese(String name, int age){
//super();
this(name);
prt("subclass:with para2: " + name + age);
}
}
public class Main {
public static void main(String[] args) {
Chinese ch = new Chinese();
ch.prt("############################");
ch = new Chinese("ensheng");
ch.prt("############################");
ch = new Chinese("enshi",23);
}
}
Result
![在这里插入图片描述](https://img-blog.csdnimg.cn/20191014132917638.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2MDk3Mzkz,size_16,color_FFFFFF,t_70)
this(name)调用了Children(string name)的构造方法,
super(name)调用了Person(string name);
改写代码,增加Animal类,让person来继承Animal
```java
public class Animal {
Animal(){
System.out.println("Superclass:animal");
}
}
public class Person extends Animal {
.....
}
Result
所有父类的构造方法依次执行。
但
super可以理解为是指向自己超(父)类对象的一个指针,而这个超类指的是离自己最近的一个父类。
reference
【java】this()与super()使用详解