数组实用类：Arrays

　　在java.util包中，有一个用于操作数组的实用类：java.util.Arrays.它提供了一系列静态方法。具体见javaAPI

package package14_7;

import java.util.Arrays;

public class Array_2 {
    public static void testStringArray(){
        String[] s1={"Tom","Jack","Mike","Tom2"};
        String[] s2={"Tom","Jack","Mike","Tom2"};
        System.out.println("s1和s2比较"+Arrays.equals(s1, s2));//true
        Arrays.sort(s1);//为数组S1排序
        System.out.println("s1和s2二次比较"+Arrays.equals(s1, s2)); //false
        System.out.println("Jack在S1数组中位置"+Arrays.binarySearch(s1, "Jack"));
        System.out.println("Jack在S2数组中位置"+Arrays.binarySearch(s2, "Jack"));
        System.out.println("s1"+Arrays.toString(s1));
    }
    public static void main(String[] args) {
        testStringArray();
    }
}

 

s1和s2比较true
s1和s2二次比较false
Jack在S1数组中位置0
Jack在S2数组中位置1
s1[Jack, Mike, Tom, Tom2]