未闭合字符文字错误

2022-01-12 00:00:00 string char java

使用 BlueJ 编写时出现错误未封闭字符文字":

Got the error "Unclosed Character Literal" , using BlueJ, when writing:

class abc
{
   public static void main(String args[])
   {
       String y;
       y = 'hello';
       System.out.println(y);
   }
}

但我不知道出了什么问题.有什么想法吗?

But I can't figure out what is wrong. Any idea?

谢谢.

推荐答案

在Java中，单引号只能取一个字符，必要时可以转义.字符串需要使用全引号，如下:

In Java, single quotes can only take one character, with escape if necessary. You need to use full quotation marks as follows for strings:

y = "hello";

你也用过

System.out.println(g);

我认为应该是

System.out.println(y);

注意:在制作 char 值时(您以后可能会使用它们)，您需要单引号.例如:

Note: When making char values (you'll likely use them later) you need single quotes. For example:

char foo='m';

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