结对编程2

package pair_program_2;

import java.util.Scanner;

/**
 * 
 * @author JackCai
 * @brief 输入两个整数A B ,range in [-100 ,- 100]，若A B都小于 0，则输出 All less than 0
 *        ；否则就判断A B中的最大值y = max(A,B), y是否处于[25 ,65] 之间，若处于，则输出 25 <= max(A,B) <=
 *        65，否则输出 Illegal !
 *
 */
public class PairProgram2 {
    public static int opA;
    /** <opA number */
    public static int opB;
    /** <opB number */
    public static int maxValue;
    /** <maxValue */

    private final static int ZERO = 0;
    private final static int LEG_RANGE_LOW = 25;
    private final static int LEG_RANGE_HIGHT = 65;
    private final static int RANGE_LOW = -100;
    private final static int RANGE_HIGHT = 100;

    private static Scanner scanner = new Scanner(System.in);

    /**
     * @brief this is the main function of this program
     * @param [in] args
     */
    public static void main(String args[]) {
        opA = getUserInput(); // 获取操作数A
        opB = getUserInput(); // 获取操作数B

        if (opA < ZERO && opB < ZERO) {
            System.out.println("All less than 0 !");
            return;
        }
        // otherwise
        maxValue = max(opA, opB); // 获取两者的MAX值
        if (maxValue >= LEG_RANGE_LOW && maxValue <= LEG_RANGE_HIGHT) { // 满足在
                                                                        // [25,65]之间的话，则输出
            System.out.println(LEG_RANGE_LOW + " <= max(" + opA + " , " + opB
                    + ") <= " + LEG_RANGE_HIGHT);
        } else {
            System.out.println("Illegal !"); // 否则就输出 Illegal !
        }
    }

    /**
     * @brief this function to get the max value between A and B (PS: some fault
     *        in these code)
     * @param [in] opA
     * @param [in] opB
     * @return
     */
    public static int max(int opA, int opB) {
        int temp = opA;
        if (opB > opA) {
            temp = opA;
        }
        return temp;
    }

    /**
     * @brief this function to get input data from user
     * @return int
     */
    public static int getUserInput() {
        int value = -1;
        System.out
                .println("please enter a integer number,range in [-100,100]:");
        while (true) {
            if (scanner.hasNextInt()) {
                value = scanner.nextInt();
                if (value >= RANGE_LOW && value <= RANGE_HIGHT) {
                    break;
                } else {
                    System.out
                            .println("Illegal range, should be in [-100,100],try again: ");
                }
            } else {
                scanner.nextLine(); // flush cache
                System.out.println("please enter right number:");
            }
        }
        return value;
    }
}