-
Notifications
You must be signed in to change notification settings - Fork 0
/
CollectionExercise.java
77 lines (65 loc) · 1.75 KB
/
CollectionExercise.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
package com.zzhow.collection_;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* 2024年3月28日
*
* @author ZZHow1024
*/
@SuppressWarnings("all")
public class CollectionExercise {
public static void main(String[] args) {
/*
案例:
1. 创建3个Dog{name,age}对象,放入到 ArrayList 中,赋给 List 引用。
2. 用选代器和增强 for 循环两种方式来遍历。
3. 重写 Dog 的toString方法,输出 name 和 age。
*/
List list = new ArrayList();
list.add(new Dog("小黑", 1));
list.add(new Dog("小黄", 3));
list.add(new Dog("小花", 5));
//使用迭代器遍历:
System.out.println("使用迭代器遍历 list");
Iterator iterator = list.iterator();
while (iterator.hasNext()) {
Object dog = iterator.next();
System.out.println("dog = " + dog);
}
System.out.println("\n使用增强 for 循环遍历 list");
//使用增强 for 循环遍历:
for (Object dog : list) {
System.out.println("dog = " + dog);
}
}
}
class Dog {
private String name = null;
private int age = 0;
public Dog() {
}
public Dog(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Dog{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}