java,super()的位置和参数

来源：互联网发布：福建农林大学网络教学编辑：程序博客网时间：2024/05/22 03:10

1 当子类的构造函数需要显式调用父类的构造函数时，super()必须为构造函数中的第一条语句

2 super()中的参数可以与父类的构造函数的参数数目一直，若无父类的构造函数，super()无参数时会调用系统默认的无参构造函数

/** * Created by liuyazhou on 2017/6/10. */public class Base {    private String name;    public Base() {        System.out.println("Base Constructor");    }    public Base(String name) {        this.name = name;        System.out.println("this.name:" + this.name);    }}

/*public class Main  extends Base{    public Main() {        super();        System.out.println("Main Constructor");    }    public static void main(String[] args) {        Base s = new Main();        System.out.println("Hello World!");    }}//    Base Constructor//    Main Constructor//    Hello World!*/public class Main  extends Base{    public Main() {        super("Tom");        System.out.println("Main Constructor");    }    public static void main(String[] args) {        Base s = new Main();        System.out.println("Hello World!");    }}//this.name:Tom//Main Constructor//Hello World!

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