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Àý×Ócode£ºModiferDemo.java
package com.glust.blog.j2se;
public class ModiferDemo{
  //ËÄÖÖ·ÃÎÊȨÏ޵ıäÁ¿£¨ÊôÐÔ£©
  private int a;
  int b;//friendly
  protected int c;
  public int d;
  //·ÃÎÊÊôÐԵĽӿÚ
  public int getA(){
    return a;
  }
  public void setA(int a){
    this.a = a;
  }
}
Àý×ÓtestCode1£º TestModiferDemo1.java
import com.glust.blog.j2se.ModiferDemo;
class TestModiferDemo1{
  public static void main(String[] args){
    ModiferDemo obj = new ModiferDemo();
    System.out.println(" a is " + obj.a);//error,private·ÃÎÊȨÏÞÖ»ÄÜÔÚÀàÌåÖпɼû
    System.out.println(" b is " + obj.b);//error,friendly
    System.out.println(" c is " + obj.c);//error,protected
    System.out.println(" d is " + obj.d);
  }
}
Àý×ÓtestCode2£º TestModiferDemo2.java
import com.glust.blog.j2se.ModiferDemo;
class TestModiferDemo2 extends ModiferDemo{
  public static void main(String[] args){
    ModiferDemo obj = new ModiferDemo();
    System.out.println(" a is " + obj.a);//error£¡private·ÃÎÊȨÏÞÖ»ÄÜÔÚÀàÌåÖпɼû
    System.out.println(" b is " + obj.b);//error£¡friendly·ÃÎÊȨÏÞͬ°üÖеÄÆäËûÀà¿ÉÒÔ·ÃÎÊ
    System.out.println(" c is " + obj.c);//ÕýÈ·£¡protected·ÃÎÊȨÏÞ£¬×ÓÀàÖпÉÒÔ·ÃÎÊ
    System.out.println(" d is " + obj.d);
  }
}
Àý×ÓtestCode3£º TestModiferDemo3.java
package com.glust.blog.j2se;
import com.glust.blog.j2se.ModiferDemo;
class TestModiferDemo3{
  public static void main(String[] args){
    ModiferDemo obj = new ModiferDemo();
    System.out.println(" a is " + obj.a);//error£¡private·ÃÎÊȨÏÞÖ»ÄÜÔÚÀàÌåÖпɼû
    System.out.println(" b is " + obj.b);//ÕýÈ·£¡frien


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