Java表达式中的双引号是什么意思？ [英] What do double quotes in a Java expression mean?

问题描述

我有：

 2 + 2+ 3 + 4 
 
hello 34+ 2 * 4 
  

有人可以解释这些表达式是如何评估的？

解决方案

将成为 String 。和 string + Int = String 。例如， / p>

 2 + 2+ 3 + 4 
  

您将在您的问题中获得 2 + 234

/ p>

 2 + 2+ 3 + 4 +hello 34+ 2 * 4 //我在' 4'和'hello'，因为表达式中有错误
  

将被评估如下： p>

  1。 output =2 + 2+ 3 + 4 +hello 34+ 2 * 4 
 2. output =2 + 2+ 3 + 4 +hello 34+ 8 // operation'*'先评估
 3. output =2 + 23+ 4 +hello 34+ 8 
 4. output =2 + 234+hello 34+ 8 
 5。 output =2 + 234hello 34+ 8 
 6. output =2 + 234hello 348
  

What does double quotes mean in Java?

I have:

"2 + 2" + 3 + 4

"hello 34" + 2 * 4

Can someone explain how these expressions are evaluated?

解决方案

anything inside " " will become String. and string + Int = String .for example,

"2 + 2" + 3 + 4

you will get 2 + 234

in your question,

"2 + 2" + 3 + 4 +"hello 34" + 2 * 4 //i added '+' between '4' and 'hello' since there is an error in expression

will be evaluated like this:

1. output = "2 + 2" + 3 + 4 +"hello 34" + 2 * 4
2. output = "2 + 2" + 3 + 4 +"hello 34" + 8 //operation '*' evaluated first
3. output = "2 + 23" + 4 +"hello 34" + 8
4. output = "2 + 234" +"hello 34" + 8
5. output = "2 + 234hello 34" + 8
6. output = "2 + 234hello 348"

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