Arrays类
1 package cn.zhou.com; 2 3 import java.util.Arrays; 4 5 /* 6 * Arrays 类 ? 7 * 8 * 数组工具类 操作数组! 9 * 10 * Arrays的方法? 11 * 12 * 13 */ 14 public class 数组工具类 { 15 public static void main(String[] args) { 16 run(); 17 run01(); 18 work(); 19 } 20 //对数组进行 升序排列! 21 public static void run(){ 22 int [] arr={45,787,4564,454,545}; 23 24 Arrays.sort(arr); 25 for(int a:arr){ 26 System.out.print(a+" "); 27 } 28 29 } 30 //数组中是包含一个元素? 31 public static void run01(){ 32 int [] arr={45,787,4564,454,545}; 33 int jiaobiao=Arrays.binarySearch(arr, 000); 34 System.out.println("找不到元素, 返回"+jiaobiao); 35 } 36 //输出字符串 37 public static void work(){ 38 int [] arr={45,787,4564,454,545}; 39 Arrays.sort(arr); 40 for (int i = 0; i < 3; i++) { 41 System.out.println(arr[i]); 42 } 43 String string=Arrays.toString(arr); 44 45 System.out.println(string); 46 47 } 48 }