方法重载的定义

使用案例

public static void main(String[] args) {
    // 匹配到max(int a, int b)
    System.out.println(max(1, 3));
    // 匹配到max(double a, double b)
    System.out.println(max(1L, 3L));
    // 匹配到max(double a, double b, double c, double d)，int自动转换为double
    System.out.println(max(1, 3, 2));
}

static int max(int a, int b) {
    System.out.println("执行了：max(int a, int b)");
    return a > b ? a : b;
}

static double max(double a, double b) {
    System.out.println("执行了：max(double a, double b)");
    return a > b ? a : b;
}

static double max(double a, double b, double c) {
    System.out.println("执行了：max(double a, double b, double c)");
    double result1 = a > b ? a : b;
    return result1 > c ? result1 : c;
}

static double max(double a, double b, double c, double d) {
    System.out.println("执行了：max(double a, double b, double c, double d)");
    double result1 = a > b ? a : b;
    double result2 = result1 > c ? result1 : c;
    return result2 > d ? result2 : d;
}