Arrays.binarySearch（）函數

public static void main(String[] args) {
    Long[] operaregister = new Long[]{Long.valueOf(3), Long.valueOf(35)};
 // <3 -1
 System.out.println("2:"+Arrays.binarySearch(operaregister, Long.valueOf(2)));
 // =3 0
 System.out.println("3:"+Arrays.binarySearch(operaregister, Long.valueOf(3)));
 // 3-35 -2
 System.out.println("30:"+Arrays.binarySearch(operaregister, Long.valueOf(30)));
 //35 1
 System.out.println("3:"+Arrays.binarySearch(operaregister, Long.valueOf(35)));
 //>35 -3
 System.out.println("40:"+Arrays.binarySearch(operaregister, Long.valueOf(40)));
}