java中的super()和this

super()和this()類似,差別是，super()從子類中調用父類的構造方法，this()在同一類内調用其它方法

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
![在這裡插入圖檔描述](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)調用了Children（string name）的構造方法，
super(name)調用了Person(string name)；
改寫代碼,增加Animal類，讓person來繼承Animal
```java
public class Animal {
	Animal(){
		System.out.println("Superclass:animal");
	}
}

public class Person extends Animal {
.....
}

           

Result

所有父類的構造方法依次執行。

但

super可以了解為是指向自己超（父）類對象的一個指針，而這個超類指的是離自己最近的一個父類。

reference

【java】this()與super()使用詳解