How to use question mark and colon in Java? :expression

This article will introduce to you the usage of question mark and colon "?:" expressions in Java. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Let’s start with a piece of Java code:

return data != null ? data.getName() : null;

Okay! =The following code is divided into three parts: A, B, and C

A is a Boolean expression (true/false), B and C are execution statements.

The most intuitive: A? B: C, which means that if A is true, execute B, otherwise execute C

The above code means that if data is not empty, return data.getName(), if data is empty, return null.

Extension

After reading the above explanation, let’s extend it again

2 ==0 ? 1 1: 2-2;

Such as 2 Equal to 0, execute 1 1. If 2 is not equal to 0, execute 2-2.

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