Java中变量之局部变量、本类成员变量、父类成员变量的访问方法

 1 package debug;
 2 
 3 class Father{
 4     int num = 10;
 5 }
 6 
 7 class Son1 extends Father{
 8     int num = 20;
 9     int num2 = 30;
10     
11     public void show() {
12         int num = 40;
13         System.out.println(num);    //采用变量名相同，就近原则，该处输出为 40
14         System.out.println(this.num);   //本类成员变量访问，该处输出为 20
15         System.out.println(super.num);    //父类成员变量访问，该处输出为 10
16         System.out.println(num2);
17     }
18 }
19 
20 
21 public class Demo14 {
22     public static void main(String[] args) {
23         Son1 s = new Son1();
24         s.show();
25     }
26 
27 }