携程java面向对象面试题

public

class

Base {

private

String name =

"hello"

;

public

Base() {

//  System.out.println(this);

//  关键是要认识到调用callName方法的是sub类型的对象

callName();

}

public

void

callName(){

System.out.println(name);

}

public

static

void

main(String[] args) {

new

Sub();

}

}

class

Sub

extends

Base{

private

String name=

"world"

;

public

void

callName(){

System.out.println(name);

}

}