三元运算符 Java [英] Ternary Operators Java

问题描述

有没有办法在三元运算中实现这一点.我对三元的东西很陌生，也许你可以指导我.

Is there a way to implement this in a ternary operation. I'm very new to that ternary stuff, maybe you could guide me.

if(selection.toLowerCase().equals("produkt"))
     cmdCse.setVisible(true);
else
     cmdCse.setVisible(false);

这个好像不行.

selection.toLowerCase().equals("produkt")?cmdCse.setVisible(true):cmdCse.setVisible(false);

推荐答案

在这种情况下，您甚至不需要三元运算符:

In this case, you don't even need a ternary operator:

 cmdCse.setVisible(selection.toLowerCase().equals("produkt"));

或者，更清洁:

 cmdCse.setVisible(selection.equalsIgnoreCase("produkt"));

您的版本:

selection.toLowerCase().equals("produkt")? cmdCse.setVisible(true): cmdCse.setVisible(false);

在语义上不正确:三元运算符应该表示替代赋值，它不能完全替代 if 语句.没关系:

is semantically incorrect: ternary operator should represent alternative assignments, it's not a full replacement for if statements. This is ok:

double wow = x > y? Math.sqrt(y): x;

因为您将 x 或 Math.sqrt(y) 分配给 wow，取决于条件.

because you are assigning either x or Math.sqrt(y) to wow, depending on a condition.

我的 2cents:只有在让你的程序更清晰的情况下才使用三元运算符，否则你最终会得到一些难以理解的单行.

My 2cents: use ternary operator only when it makes your program clearer, otherwise you will end up having some undecipherable one-liners.

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