java面试题金山实习生

.输入4个数，构成两个区间，输出他们的整数交集区间。例如：1，10 , 5 , 15.输出【5，10】；写出思路和代码

/**
 * 前提 a<=b c<=d
 * 
 * @param a
 * @param b
 * @param c
 * @param d
 * @return
 */
public static String getResult(int a, int b, int c, int d) {
    String result = "";
    if (b < c) {
        result = "";
    }
    if (a > d) {
        result = "";
    }
    if (a < c && b > c && b < d) {
        result = "[" + c + "," + b + "]";
    }
    if (a > c && b > d) {
        result = "[" + a + "," + d + "]";
    }
    if (a > c && b < d) {
        result = "[" + a + "," + b + "]";
    }

    if (a < c && b > d) {
        result = "[" + c + "," + d + "]";
    }

    return result;

}