随机数生成器问题
Random number generator problems
我的问题是下面的代码是否正确地生成了一个随机数,因为在过去的 20 次尝试中我得到了 5 次 500 000,这根本没有反映出获得它的 2% 的机会......
public static int randInt(int min, int max) {
// NOTE: Usually this should be a field rather than a method
// variable so that it is not re-seeded every call.
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((max - min) + 1) + min;
return randomNum;
}
public void prizegenerator(View v) {
int fate = randInt(0,100);
int reward=0;
if (fate <= 30) {
reward = 1000;
}
else if (fate <= 50) {
reward = 2000;
}
else if (fate <= 80) {
reward = 5000;
}
else if (fate <=90) {
reward = 10000;
}
else if (fate <= 95) {
reward = 50000;
}
else if (fate <= 97) {
reward = 100000;
}
else if (fate <= 99) {
reward = 500000;
}
else if (fate <= 100) {
reward = 1000000;
}
我将您的代码绑定到简单的 main 方法中并且工作正常。亲自尝试一下:
public static void main(String[] args) {
Main main = new Main();
List<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < 100; i++) {
list.add(main.prizegenerator());
}
Collections.sort(list);
for (Integer integer : list) {
System.out.println(integer);
}
}
当我 运行 它多次时,它生成的次数主要是 500000 的 2 倍,这与你的 2% 几率(对于 98 和 99)相匹配
我的问题是下面的代码是否正确地生成了一个随机数,因为在过去的 20 次尝试中我得到了 5 次 500 000,这根本没有反映出获得它的 2% 的机会......
public static int randInt(int min, int max) {
// NOTE: Usually this should be a field rather than a method
// variable so that it is not re-seeded every call.
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((max - min) + 1) + min;
return randomNum;
}
public void prizegenerator(View v) {
int fate = randInt(0,100);
int reward=0;
if (fate <= 30) {
reward = 1000;
}
else if (fate <= 50) {
reward = 2000;
}
else if (fate <= 80) {
reward = 5000;
}
else if (fate <=90) {
reward = 10000;
}
else if (fate <= 95) {
reward = 50000;
}
else if (fate <= 97) {
reward = 100000;
}
else if (fate <= 99) {
reward = 500000;
}
else if (fate <= 100) {
reward = 1000000;
}
我将您的代码绑定到简单的 main 方法中并且工作正常。亲自尝试一下:
public static void main(String[] args) {
Main main = new Main();
List<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < 100; i++) {
list.add(main.prizegenerator());
}
Collections.sort(list);
for (Integer integer : list) {
System.out.println(integer);
}
}
当我 运行 它多次时,它生成的次数主要是 500000 的 2 倍,这与你的 2% 几率(对于 98 和 99)相匹配