ShuffleAnArray
ShuffleAnArray.java 源码
package datastructure.array.leetcode;
import java.util.Random;
/**
* @author roseduan
* @time 2020/11/16 7:17 下午
* @description 打乱数组
*/
public class ShuffleAnArray {
private final int[] nums;
private final Random random = new Random();
public ShuffleAnArray(int[] nums) {
this.nums = nums;
}
/** Resets the array to its original configuration and return it. */
public int[] reset() {
return this.nums;
}
/** Returns a random shuffling of the array. */
public int[] shuffle() {
int[] data = new int[nums.length];
System.arraycopy(nums, 0, data, 0, nums.length);
for (int i = 0; i < data.length; i++) {
int temp = data[i];
int r = random.nextInt(data.length);
data[i] = data[r];
data[r] = temp;
}
return data;
}
}
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