[英]Random Output, not working correctly
我尝试编写一个程序来选择团队随机管理,但是当我运行它时,我每次都得到相同的4个团队而不是不同的团队?
我试图这样做,以便每次我生成一个随机数,它将进入一个数组。然后我会检查该数组,看看之前是否使用过该数字。
任何帮助或建议将不胜感激。 谢谢!
import java.util.*;
class Start {
static String[] places = {"Man Utd", "Arsenal", "Aston Villa", "Chelsea",
"Everton", "Fulham", "Liverpool", "Man City", "Newcastle", "Norwich",
"QPR", "Reading", "Southampton", "Stoke", "Sunderland", "Swansea",
"Spurs", "West Brom", "West ham", "Wigan"};
static int[] NA = {21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21};
static Random rand = new Random();
static int RandInt = 0;
static boolean x = false;
static boolean p = false;
static int player = 1;
public static void main(String[] args) {
while (x != true) {
RandInt = rand.nextInt(places.length);
for (int k = 0; k <= NA.length; k++) {
while (p != true) {
if (RandInt == NA[k]) {
RandInt = rand.nextInt(places.length);
} else {
p = true;
NA[k] = RandInt;
}
}
System.out.println("player " + player + " is managing " + places[RandInt]);
player++;
p = false;
if (player >= 5) {
x = true;
System.exit(0);
}
}
}
}
}
我稍微“清理”了你的代码并更改了Array以检查重复的随机数到ArrayList。 它不是最快的解决方案,但应该可行。
问题是,在整个程序退出之前,你不会退出for循环。 正如上面描述的geoand,RandInt == NA [k]将永远不会成立,因为RandInt将始终<= 19,因此不会生成新的随机数。 所以代码中有两个错误的东西。
当您想要了解有关更快检查重复条目的更多信息时,这可能会对您有所帮助: http : //javarevisited.blogspot.de/2012/02/how-to-check-or-detect-duplicate.html
我希望我能帮助你。 :)
static String[] places = {"Man Utd", "Arsenal", "Aston Villa", "Chelsea",
"Everton", "Fulham", "Liverpool", "Man City", "Newcastle", "Norwich",
"QPR", "Reading", "Southampton", "Stoke", "Sunderland", "Swansea",
"Spurs", "West Brom", "West ham", "Wigan"};
static int[] NA = new ArrayList<Integer>(5);
static Random rand = new Random();
static int RandInt = 0;
static int player = 1;
public static void main(String[] args) {
while (player < 5) {
RandInt = rand.nextInt(places.length);
for (int i = 0; i <= NA.size(); i++) {
if (RandInt == NA.get(i)) {
RandInt = rand.nextInt(places.length);
} else {
NA.add(RandInt);
break;
}
}
System.out.println("player " + player + " is managing " + places[RandInt]);
player++;
}
System.exit(0);
}
问题是RandInt==NA[k]
永远不会为真(因为由于places
的大小, RandomInt
最多为19),因此在for循环中从不更新RandomInt
。 while循环只执行一次,因为for循环似乎完成了所有工作
好像你需要重新考虑你的随机生成算法
我的建议是在for
循环中生成一个随机数,如下所示
while (x != true) {
for (int k = 0; k <= NA.length; k++) {
RandInt = rand.nextInt(places.length);
while (p != true) {
if (RandInt == NA[k]) {
RandInt = rand.nextInt(places.length);
} else {
p = true;
NA[k] = RandInt;
}
}
System.out.println("player " + player + " is managing " + places[RandInt]);
player++;
p = false;
if (player >= 5) {
x = true;
System.exit(0);
}
}
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