在下面的代码中，我尝试制作一个数组混洗器。这将使字符数组（charArray）随机播放多次runTimes，并将每个数组存储在二维数组中shuffledArrays。问题在于程序由于某种原因完成for循环时，会将所有数组设置为最后一个添加的数组。
任何帮助表示赞赏，谢谢。
import java.util.Random;
public class Testing {
public static void main(String[] args) {
char[] charArray = {'a', 'b', 'c', 'd', 'e', 'f'}; //Array to be shuffled
int runTimes = 3; //Amount of shuffled arrays to create
char[][] shuffledArrays = new char[runTimes][charArray.length];;
for (int x = 0; x != runTimes; x++) {
shuffledArrays[x] = shuffleArray(charArray);
System.out.print("IN FOR LOOP: shuffledArrays[" + x + "] = ");
System.out.println(shuffledArrays[x]);
}
System.out.print("OUT OF FOR LOOP: shuffledArrays[0] = ");
System.out.println(shuffledArrays[0]);
System.out.print("OUT OF FOR LOOP: shuffledArrays[1] = ");
System.out.println(shuffledArrays[1]);
System.out.print("OUT OF FOR LOOP: shuffledArrays[2] = ");
System.out.println(shuffledArrays[2]);
}
private static char[] shuffleArray(char[] array) {
Random rand = new Random();
for (int x = 0; x < array.length; x++) {
int randomIndexToSwap = rand.nextInt(array.length);
char temp = array[randomIndexToSwap];
array[randomIndexToSwap] = array[x];
array[x] = temp;
}
return array;
}
}
除了更改原始数组，您还需要更改数组的副本，例如
private static char[] shuffleArray(char[] inArray) {
Random rand = new Random();
char[] array = inArray.clone();
for (int x = 0; x < array.length; x++) {
int randomIndexToSwap = rand.nextInt(array.length);
char temp = array[randomIndexToSwap];
array[randomIndexToSwap] = array[x];
array[x] = temp;
}
return array;
}
运行示例：
IN FOR LOOP: shuffledArrays[0] = dcfaeb
IN FOR LOOP: shuffledArrays[1] = edcbaf
IN FOR LOOP: shuffledArrays[2] = bfaced
OUT OF FOR LOOP: shuffledArrays[0] = dcfaeb
OUT OF FOR LOOP: shuffledArrays[1] = edcbaf
OUT OF FOR LOOP: shuffledArrays[2] = bfaced
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我来说两句