日期:2014-05-20  浏览次数:20694 次

编译不过啊
package T4;
class People{
public int identifier; //编号
public int new_identifier;
public boolean state; //圈内或圈外
static int i = 0;
public People(){
new_identifier = identifier = i = i+1;
state = true;
}
}
class Test4 {
private People[] people;
public Test4(){
people = new People[100];
}
public void gamerunning(){
int peopleinrool = 100;
while(peopleinrool > 1){//当剩下一人,游戏结束
for(int i = 0; i < 100 ;i++){
int newid = 1;
if(people[i].state){
if(people[i].new_identifier%3 == 0){
people[i].state = false;
peopleinrool--;
}
else
people[i].new_identifier = newid++;
}
}
}
for(int i = 0; i < 100; i++)
if(people[i].state == true){
System.out.print(people[i].identifier);
}
}
public static void main(String[] args){
Test4 test4 = new Test4();
test4.gamerunning();
}
}

------解决方案--------------------
people = new People[100];
只是初始化了数组长度
里面的元素没有初始化 

------解决方案--------------------
探讨

people = new People[100];
只是初始化了数组长度
里面的元素没有初始化

------解决方案--------------------
楼主你的数组没有初始化,所以想得到某个数组的state的时候就报错了。
楼主不妨参考下如下代码
Java code


import java.util.Scanner;

/**
 * @ClassName: Test4
 * @Description: TODO(这里用一句话描述这个类的作用)
 * @author A18ccms a18ccms_gmail_com
 * @date 2012-2-3 下午12:30:38
 */

class Test4 {
    private static class Node { 
        public int no;// 编号 
        public Node next;// 下一个节点 
 
        public Node(int no) { 
            this.no = no; 
        } 
    } 
 
    public static void main(String[] args) { 
        Scanner scanner = new Scanner(System.in); 
        System.out.print("请输入总人数:"); 
        int totalNum = scanner.nextInt(); 
        System.out.print("请输入报数的大小:"); 
        int cycleNum = scanner.nextInt(); 
        Node header = new Node(1); 
        Node pointer = header; 
        for (int i = 2; i <= totalNum; i++) { 
            //指向下一个节点
            pointer.next = new Node(i); 
            //前移
            pointer = pointer.next; 
        } 
        //形成循环链表 尾部指向头部
        pointer.next = header; 
        // 初始化环形链表结束 
        System.out.println("以下是出列的顺序:"); 
        while (pointer != pointer.next) { 
            for (int i = 1; i < cycleNum; i++) { 
                //从头开始
                pointer = pointer.next; 
            } 
            System.out.println(pointer.next.no);
            //前进
            pointer.next = pointer.next.next; 
        } 
        System.out.println(pointer.next.no); 
    } 
}