如何在java中连接字符？ [英] How to concatenate characters in java?

问题描述

如何在java中连接字符？连接字符串在字符串之间只需要一个 + ，但使用 + 连接字符会将char的值更改为ascii并因此给出数字输出。我想做 System.out.println（char1 + char2 + char3 ... ，并创建一个类似这样的String字符。

我可以做

  System.out.print（char1）; 
 System.out.print char2）; 
 System.out.print（char3）; 
  

感谢

 字符串s = new StringBuilder（）。append（char1）.append（char2）.append（char3）.toString（）; 
  

请注意

  String b =b; 
 String s =a+ b + c; 
  

实际编译为

  String s = new StringBuilder（a）append（b）.append（c）。toString（）; 
  

编辑：如litb指出，您也可以这样做：

 + char1 + char2 + char3; 
  

编译成以下内容：

  new StringBuilder（）。append（）。append（c）.append（c1）.append（c2）.toString 
  

编辑（2）：修正字符串追加比较，作为cletus点out，一系列字符串由编译器处理。

上面的目的是说明编译器是做什么的，而不是告诉你应该做什么。 / p>

How do you concatenate characters in java? Concatenating strings would only require a + between the strings, but concatenating chars using + will change the value of the char into ascii and hence giving a numerical output. I want to do System.out.println(char1+char2+char3... and create a String word like this.

I could do

System.out.print(char1);
System.out.print(char2);
System.out.print(char3);

But, this will only get me the characters in 1 line. I need it as a string. Any help would be appreciated.

Thanks

解决方案

Do you want to make a string out of them?

String s = new StringBuilder().append(char1).append(char2).append(char3).toString();

Note that

String b = "b";
String s = "a" + b + "c";

Actually compiles to

String s = new StringBuilder("a").append(b).append("c").toString();

Edit: as litb pointed out, you can also do this:

"" + char1 + char2 + char3;

That compiles to the following:

new StringBuilder().append("").append(c).append(c1).append(c2).toString();

Edit (2): Corrected string append comparison since, as cletus points out, a series of strings is handled by the compiler.

The purpose of the above is to illustrate what the compiler does, not to tell you what you should do.

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