031-Java-022

foreach循环

它能在不使用下标的情况下遍历数组。

public class TestArray {   public static void main(String[] args) {      double[] myList = {1.0, 2, 3, 3};       // 打印所有数组元素      for (double element: myList) {         System.out.println(element);      }   }}

数组倒序

public class Test2 {public static void main(String[] args){    int[] test= {1,2,4,5,7};    for (int i : test) {        System.out.print(i+" ");    }    System.out.println("\n");    test = Test2.reverse(test);    for (int i : test) {        System.out.print(i+" ");    }}public static int[] reverse(int[] arr){    int[] resoult = new int[arr.length];    for (int i = 0,j=resoult.length-1; i < arr.length; i++,j--) {        resoult[j] = arr[i];    }    return resoult;}}