java中自己常犯的错误汇总

2018-12-12 09:23:12来源：博客园阅读 ()

 1 package debug;
 2 
 3 /**
 4  1、定义一个公共的动物类，包含名字、年龄、颜色和吃饭东西方法
 5  2、定义一个猫类，继承动物类，同时拥有玩游戏的本领
 6  3、定义一个狗类，继承动物类，同时拥有看门的本领
 7  */
 8 
 9 class Animal{
10     private String name;
11     private int age;
12     private String color;
13     
14     public Animal() {
15         
16     }
17     
18     public Animal(String name,int age,String color) {
19         this.name = name;
20         this.age = age;
21         this.color = color;
22     }
23     
24     public String getName() {
25         return name;
26     }
27     
28     public int getAge() {
29         return age;
30     }
31     
32     public String getColor() {
33         return color;
34     }
35     
36     public void setName(String name) {
37         this.name = name;
38     }
39     
40     public void setAge(int age) {
41         this.age = age;
42     }
43     
44     public void setColor(String color) {
45         this.color = color;
46     }
47     
48     public void eat() {
49         System.out.println("饿了就要吃饭");
50     }
51 }
52 
53 class Cat extends Animal{
54     public Cat() {}
55     
56     public Cat(String name,int age,String color) {
57         super(name,age,color);
58     }
59     
60     public void playGame() {
61         System.out.println("猫都会玩游戏了");
62     }
63 
64 }
65 
66 
67 public class Demo16 {
68     public static void main(String[] args) {
69         Cat c1 = new Cat();
70         c1.setName("tom");
71         c1.setAge(3);
72         c1.setColor("white");
73         c1.playGame();
74         System.out.println("猫的名字叫:" + c1.getName() + "\n年龄为:" + c1.getAge() + "\n颜色为:" + c1.getColor());
75         
76         Cat c2 = new Cat("jerry",5,"yellow");
77         System.out.println("猫的名字叫:" + c2.getName() + "\n年龄为:" + c2.getAge() + "\n颜色为:" + c2.getColor());
78     }
79 
80 }