java面试题三十 public,private,protected,default访问权限

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1 考题描述：

2 答案

3解析

B. no modifer既为default也就是friendly

3.1 public,private,protected,default访问权限图

3.2证明

3.2.1 myeclipse类关系图如下

3.2.2 各个类的代码

Student.java

package com.inner;public class Student {    public  String name = "zhangsan";    String email = "1254290201@qq.com";    protected int age = 13;    private String address = "广州";    public static void main(String[] args) {Student student = new Student();System.out.println("name = " + student.name);System.out.println("email = " + student.email);System.out.println("age = " + student.age);System.out.println("address = " + student.address);}}

MyTest1.java

package com.inner;public class MyTest1 {public static void main(String[] args) {Student student = new Student();System.out.println("name = " + student.name);System.out.println("email = " + student.email);System.out.println("age = " + student.age);System.out.println("address = " + student.address); //这行编译通不过}}

MyTest2MyTest2MyTest2MyTest2.java

package com;import com.inner.Student;public class MyTest2 {public static void main(String[] args) {Student student = new Student();System.out.println("name = " + student.name);System.out.println("email = " + student.email); //这行编译通不过System.out.println("age = " + student.age); //这行编译通不过System.out.println("address = " + student.address); //这行编译通不过}}

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