数组反转

package javatest2;
 
import java.util.ArrayList;
 
public class JavaTest2 {


	public static void main(String[] args) {
		String[] Array = { "a", "b", "c", "d", "e" };
		reverseArray1(Array);// 使用集合ArrayList实现反转
		for (int j = 0; j < Array.length; j++) {
			System.out.print(Array[j] + " ");
		}
 
		System.out.print("\n");
		String[] temp = reverseArray2(Array);// 直接使用数组实现反转
		for (int j = 0; j < temp.length; j++) {
			System.out.print(Array[j] + " ");
		}
 
	}
 
	/*
	 * 函数：reverseArray1和reverseArray2 
	 * 功能：实现 数组翻转
	 * 例如：{'a','b','c','d'}变成{'d','c','b','a'}
	 */
	private static void reverseArray1(String[] Array) {
		ArrayList<String> array_list = new ArrayList<String>();
		for (int i = 0; i < Array.length; i++) {
			array_list.add(Array[Array.length - i - 1]);
		}
		Array = array_list.toArray(Array);
	}
 
	private static String[] reverseArray2(String[] Array) {
		String[] new_array = new String[Array.length];
		for (int i = 0; i < Array.length; i++) {
			// 反转后数组的第一个元素等于源数组的最后一个元素：
			new_array[i] = Array[Array.length - i - 1];
		}
		return new_array;
	}
 
}

import java.util.ArrayList;
import java.util.Collections;
 
public class Main {
    public static void main(String[] args) {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("A");
        arrayList.add("B");
        arrayList.add("C");
        arrayList.add("D");
        arrayList.add("E");
        System.out.println("反转前排序: " + arrayList);
        Collections.reverse(arrayList);
        System.out.println("反转后排序: " + arrayList);
    }
}

以上代码运行输出结果为：

反转前排序: [A, B, C, D, E] 
反转后排序: [E, D, C, B, A]