java.util.Arrays 類能方便地操作陣列，它提供的所有方法都是靜態的，
例子如下：
import java.util.Arrays;
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------判斷兩個陣列是否相等-----");
int [ ] num1 = {1,2,3};
int [ ] num2 = {1,2,4};
boolean b = Arrays.equals(num1, num2);
System.out.print(b);
System.out.println("\n------轉換為字串-----");
int [] num3 = {5,6,4,5,8};
String s = Arrays.toString(num3);
System.out.print(s);
System.out.println("\n------賦值相同數值-----");
int [ ] num4 = {1,2,4};
Arrays.fill(num4,66);
for (int i : num4) {
System.out.print(i+" ");
}
System.out.println("\n------復制為新陣列-----");
int [ ] num5 = {1,2,4};
int[] num55 = Arrays.copyOf(num5, 5);
for (int i : num55) {
System.out.print(i);
}
System.out.println("\n------查詢元素下標-----");
int [ ] num6 = {1,2,4};
int i = Arrays.binarySearch(num6, 4);
System.out.println(i);
}
}
運行結果如下：
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標籤：java
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