java中的继承

（1）比较好理解的

 1 class Fu {
 2     int num1 = 5;
 3 }
 4 
 5 class Zi extends Fu {
 6     int num2 = 4;
 7 }
 8 
 9 public class zihefu {
10 
11     public static void main(String[] args) {
12         Zi z = new Zi();
13         System.out.println(z.num1 + "....." + z.num2);
14 
15     }
16 
17 }

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（2）比较能理解的

 1 class Fu {
 2     int num = 5;
 3 }
 4 
 5 class Zi extends Fu {
 6     int num = 4;
 7 }
 8 
 9 public class zihefu {
10 
11     public static void main(String[] args) {
12         Zi z = new Zi();
13         System.out.println(z.num + "....." + z.num);
14 
15     }
16 
17 }

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（3）this

 1 class Fu {
 2     int num = 5;
 3 }
 4 
 5 class Zi extends Fu {
 6     int num = 4;
 7     void show(){
 8         System.out.println(this.num);//注意看这,子类的方法
 9     }
10 }
11 
12 public class zihefu {
13 
14     public static void main(String[] args) {
15         Zi z = new Zi();
16         z.show();
17         System.out.println(z.num + "....." + z.num);
18 
19     }
20 }

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（4）super

 1 class Fu {
 2     int num = 5;
 3 }
 4 
 5 class Zi extends Fu {
 6     int num = 4;
 7     void show(){
 8         System.out.println(super.num);//注意看这,子类的方法
 9     }
10 }
11 
12 public class zihefu {
13 
14     public static void main(String[] args) {
15         Zi z = new Zi();
16         z.show();
17         System.out.println(z.num + "....." + z.num);
18 
19     }
20 }

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