Arrays类的用法详述

public class Test3 { public static void main(String[] args) { int [] nums = {6,9,8,4,2}; Arrays.sort(nums); System.out.println("------升序-----"); for (int num : nums) { System.out.print(num+""); }

System.out.println("\n------降序-----"); for (int i = nums.length-1; i >=0 ; i--) { System.out.print(nums[i]+""); }

System.out.println("\n------字符串排序-----"); String [] mm = {"n","1","6","M","a","5"}; Arrays.sort(mm); for (String s : mm) { System.out.print(s); }

System.out.println("\n------判断两个数组是否相等-----"); int [ ] num1 = {1,2,3}; int [ ] num2 = {1,2,4}; boolean b = Arrays.equals(num1, num2); System.out.print(b);

System.out.println("\n------转换为字符串-----"); int [] num3 = {5,6,4,5,8}; String s = Arrays.toString(num3); System.out.print(s);

System.out.println("\n------赋值相同数值-----"); int [ ] num4 = {1,2,4}; Arrays.fill(num4,66); for (int i : num4) { System.out.print(i+" "); }

System.out.println("\n------复制为新数组-----"); int [ ] num5 = {1,2,4}; int[] num55 = Arrays.copyOf(num5, 5); for (int i : num55) { System.out.print(i); }

System.out.println("\n------查询元素下标-----"); int [ ] num6 = {1,2,4}; int i = Arrays.binarySearch(num6, 4); System.out.println(i); }}