还是使用包的问题。

package one;
public class Alpha{
private int iamprivate=1;
int iampackage=2;
protected int iamprotected=3;
public int iampublic=4;
private void privateMethod(){
System.out.println("iamprivate Method"); }
void packageMethod(){
System.out.println("iampackageMethod");

}
protected void protectedMethod(){
System.out.println("iampublic Method");
}
public void publicMethod(){
System.out.println("iampublic Method");
}
public static void main(String[] args){
Alpha a=new Alpha();
a.privateMethod();
a.packageMethod();
a.protectedMethod();
a.publicMethod();
System.out.println("iamprivate:"+a.iamprivate);
System.out.println("iampackage:"+a.iampackage);
System.out.println("iamprotected:"+a.iamprotected);
System.out.println("iampublic:"+a.iampublic);
}
}
这是Alpha类