java继承方法重写权限问题

来源：互联网发布：php转换大小写编辑：程序博客网时间：2024/06/05 17:18

子类复写父类的方法时不能拥有比父类更严格的访问权限（更小的权限）
权限大小 private

package com.test.extendtest;public class Person {    public void doSomeThing_public() {        System.out.println("Person doSomeThing_public");    }    void doSomeThing_default() {        System.out.println("Person doSomeThing_default");    }    private void doSomeThing_private() {        System.out.println("Person doSomeThing_private");    }}

package com.test.extendtest;public class Student extends Person{    public static void main(String[] args) {        //new Student().doSomeThing_public();        //new Student().doSomeThing_default();        new Student().doSomeThing_private();    }    //权限大小  private<default<public    //==============继承doSomeThing_public=============/*  public void doSomeThing_public() {        System.out.println("Student doSomeThing_public");//public-》public覆盖  Student doSomeThing_public    }*/    /*void doSomeThing_public() {        System.out.println("Student doSomeThing_public");//public-》default  编译不通过    }*/    /*private void doSomeThing_public() {        System.out.println("Student doSomeThing_public");//public-》private  编译不通过    }*/    //===============继承doSomeThing_default============    /*public void doSomeThing_default() {        System.out.println("Student doSomeThing_default");//default-》public不算覆盖 Student doSomeThing_default    }*//*  void doSomeThing_default() {        System.out.println("Student doSomeThing_default");//default-》default覆盖  Student doSomeThing_default    }*/    /*private void doSomeThing_default() {        System.out.println("Student doSomeThing_default");//default-》private  编译不通过    }*/    //==============继承doSomeThing_private=============/*   public void doSomeThing_private() {    System.out.println("Student doSomeThing_private");//private-》public不算覆盖 Student doSomeThing_private}*/    /* void doSomeThing_private() {        System.out.println("Student doSomeThing_private");//private-》default不算覆盖   Student doSomeThing_private    }    */    private void doSomeThing_private() {        System.out.println("Student doSomeThing_private");//private-》private覆盖  //Student doSomeThing_private    }}

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