本文实例讲述了Java简单实现农夫过河问题。分享给大家供大家参考，具体如下：
一、问题描述
老伯伯要带鱼、狗、猫过河到对岸.，有一条船，只能坐一个人，老伯每次只能带一样动物过河，当老伯不在的时侯狗会咬猫，猫会吃鱼.，请问怎么顺序过河呢？
二、实现代码
|
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
|
package demo;import java.util.ArrayList;import java.util.List;public class CrossRiver { List<String> listThis = new ArrayList<String>(); List<String> listThat = new ArrayList<String>(); /*boolean thisFlag = true; boolean thatFlag = false;*/ public CrossRiver() { listThis.add("dog"); listThis.add("fish"); listThis.add("cat"); // listThis.add("people"); } public boolean isSafe(@SuppressWarnings("rawtypes") List list){ if(list.contains("fish")&&list.contains("cat")||list.contains("cat")&&list.contains("dog")){ return false; }else{ return true; } } public void thisTothat(){ String str = listThis.get(0); listThis.remove(str); if(this.isSafe(listThis)){ System.out.println("农夫带着 " + str + " 从此岸到彼岸"); System.out.println("此岸" + listThis + "\b" + "彼岸" + listThat); System.out.println(); listThat.add(str); thatToThis(); }else{ listThis.add(str); thisTothat(); } } public void thatToThis(){ if(listThis.isEmpty()){ System.out.println("此岸" + listThis + "\b" + "彼岸" + listThat); return; } if(isSafe(listThat)){ System.out.println("农夫从彼岸到此岸"); System.out.println("此岸" + listThis + "\b" + "彼岸" + listThat); System.out.println(); thisTothat(); }else{ String str = listThat.get(0); listThat.remove(0); if(isSafe(listThat)){ System.out.println("农夫带着 " + str + " 从彼岸到此岸"); System.out.println("此岸" + listThis + "\b" + "彼岸" + listThat); System.out.println(); listThis.add(str); thisTothat(); }else{ listThat.add(str); thatToThis(); } } } public static void main(String[] args){ System.out.println("服务器之家测试结果："); System.out.println(); new CrossRiver().thisTothat(); }} |
运行结果：
希望本文所述对大家java程序设计有所帮助。
