Java 中有关数组的操作

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package com.asia.sun.demo6;import java.util.Arrays;public class Array01 {public static void main(String[] args) {System.out.println("-------------------定义一维数组------------------");//定义一维数组int day[]={31,28,31,30,31,30,31,31,30,31,30,31};for(int i = 0;i<12; i++){System.out.println((i+1)+"月有"+day[i]+"天");}System.out.println("-------------------定义二维数组------------------");//定义二维数组int a[][] = new int[3][4];for(int i =0;i<a.length;i++){for(int j =0;j<a[i].length;j++){System.out.println(a[i][j]);}System.out.println();}//定义字符型数组String ar[] = new String[]{"ab","cd","ef","yz"};System.out.println("定义字符型数组");System.out.println("---------------------遍历输出二维数组----------------------");//遍历输出二维数组int arr[][]={{4,3},{1,2}};System.out.println("数组中的元素是：");for(int x[]:arr){for(int e:x){if(e==x.length){//数组的最后一个元素System.out.println(e);}else{//不是数组的最后一个元素输出System.out.println(e+"、");}}}System.out.println("-------------------初始化数组----------------");//使用同一个值对数组进行填充//int arr1[] = new int[5];//Arrays.fill(arr1, 8);int arr1[]=new int[] {2,7,3,9};//对数组元素进行初始化Arrays.fill(arr1,3,4,5);System.out.println("-------------------对数组进行排序-------------------");//对数组信息排序Arrays.sort(arr1);for(int i=0;i<arr1.length;i++){System.out.println("第"+i+"个元素是"+arr1[i]);}System.out.println("----------------复制数组--------------------");//复制数组//int newarr[] = Arrays.copyOf(arr1,5);int newarr[] = Arrays.copyOfRange(arr1, 1, 8);for(int i=0;i<newarr.length;i++){System.out.println("第"+i+"个元素是"+newarr[i]);}System.out.println("-----------------数组中指定元素的索引位置--------------------");Arrays.sort(arr1);int index = Arrays.binarySearch(arr1, 7);System.out.println("数组中元素7所在的索引位置"+index);System.out.println("---------------在指定的搜索范围内搜索元素所在的索引---------------");Arrays.sort(arr1);int i = Arrays.binarySearch(ar,0,3,"cd");System.out.println("数组中元素cd所在的索引位置"+i);System.out.println("-------------------行互换后数组的内容---------------------");int arr2[][]=new int[][]{{1,2,3},{4,5,6},{7,8,9}};System.out.println("数组原有内容：");for(int k = 0;k<arr2.length;k++){for(int j=0;j<arr2.length;j++){System.out.print(arr2[k][j]);}System.out.println();}System.out.println("行列互换后数组内容：");for(int k = 0;k<arr2.length;k++){for(int j=0;j<arr2.length;j++){System.out.print(arr2[j][k]);}System.out.println();}}}
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