内部类外部类变量重名引用

public class TheSameName {
private int x;
private class Inner {
private int x = 9;
public void doit(int x) {
x++; //调用的是形参x
this.x++; //调用内部类的变量x
TheSameName.this.x++; //调用外部类的变量x
}
}
}