什么是“？”用Java表示？ [英] What does "?" mean in Java?

问题描述

我不知道问号（？）在java中代表什么，我正在做一个小程序，一个Nim游戏。正在寻找一本书，寻求帮助并看到这句话：

I dont know what the question mark (?) stand for in java, I was doing a small program, a Nim-game. were looking in a book, for help and saw this statement:

int pinsToTake = (min >= 2) ? 2 : 1;

我不明白，会是什么？表示，它可以与if语句有关但你把它放在一个变量中吗？并且：可以是其他的东西？ （我刚才说的这些东西可能会产生误导）

I don't understand it, what will ? represent, can it be something to do with if-statement but you put it in a variable? and the : can be something "else"? (this things that I just said can be very misleading)

推荐答案

someval =（min> = 2）？ 2：1;

someval = (min >= 2) ? 2 : 1;

这称为三元运算符，可用作 if-else 。这相当于

This is called ternary operator, which can be used as if-else. this is equivalent to

if((min >= 2) {
   someval =2;
} else {
   someval =1
}

关注教程了解更多信息和用法。

Follow this tutorial for more info and usage.

这篇关于什么是“？”用Java表示？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！