父类和子类的构造方法的调用顺序

Posted 2020-08-26 xyqing525

父类和子类的构造方法的调用顺序

（1）Java例子：

package niukewang;

public class Dervied extends Base {

    private String name = "dervied";

    public Dervied() {
        tellName();
        printName();
    }
    
    public void tellName() {
        System.out.println("Dervied tell name: " + name);
    }
    
    public void printName() {
        System.out.println("Dervied print name: " + name);
    }

    public static void main(String[] args){
        
        new Dervied();    
    }
}

class Base {
    
    private String name = "base";

    public Base() {
        tellName();
        printName();
    }
    
    public void tellName() {
        System.out.println("Base tell name: " + name);
    }
    
    public void printName() {
        System.out.println("Base print name: " + name);
    }
}

（2）输出结果：

Dervied tell name: null
Dervied print name: null
Dervied tell name: dervied
Dervied print name: dervied