二分查找

package prepare1;

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
        int data[] = new int[] {1,5,6,3,8,9,2,4,7,10};
        java.util.Arrays.sort(data);//将data数组排序
        
        System.out.println(Arrays.binarySearch(data, 9));//寻找第9位的数字,也就是8
    }
}