Java数组排序和插入

如何排序数组并插入元素？

以下示例显示如何使用sort()方法和用户定义的insertElement()方法来完成此任务。

package com.yiibai;

import java.util.*; public class ArraySortAndInsert { public static void main(String args[]) throws Exception { int array[] = { 2, 5, -2, 6, -3, 8, 0, -7, -9, 4 }; Arrays.sort(array); printArray("Sorted array", array); int index = Arrays.binarySearch(array, 1); System.out.println("Didn\'t find 1 @ " + index); int newIndex = -index - 1; array = insertElement(array, 1, newIndex); printArray("With 1 added", array); } private static void printArray(String message, int array[]) { System.out.println(message + ": [length: " + array.length + "]"); for (int i = 0; i < array.length; i++) { if (i != 0) { System.out.print(", "); } System.out.print(array[i]); } System.out.println(); } private static int[] insertElement(int original[], int element, int index) { int length = original.length; int destination[] = new int[length + 1]; System.arraycopy(original, 0, destination, 0, index); destination[index] = element; System.arraycopy(original, index, destination, index + 1, length - index); return destination; } } 

Java

执行上面示例代码，得到以下结果 -

Sorted array: [length: 10]
-9, -7, -3, -2, 0, 2, 4, 5, 6, 8
Didn\'t find 1 @ -6
With 1 added: [length: 11]
-9, -7, -3, -2, 0, 1, 2, 4, 5, 6, 8