java进阶（1）

程序: clear清晰, correct正确, usable可用, robust可靠, flexible灵活, maintainable可维护

I. 静态工厂方法代替构造函数
三元运算符:
python中，

a, b = 10, 20
min = a if b > a else b

java中

public class MAX {

    private static int a = 10;
    private static int b = 20;
    private static int min;
    public static void main(String[] args) {
        min = (a > b) ? b : a;
        System.out.println("the min number is " + min);
    }
}