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
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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();
}
}
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运行结果：
希望本文所述对大家java程序设计有所帮助。