Arrays.binarySearch（）函数

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)));
}