设置短值 Java
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/2294934/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Setting Short Value Java
提问by Mubashar
I am writing a little code in J2ME. I have a class with a method setTableId(Short tableId). Now when I try to write setTableId(100)it gives compile time error. How can I set the short value without declaring another short variable?
我正在用 J2ME 编写一些代码。我有一个带有方法的类setTableId(Short tableId)。现在，当我尝试编写setTableId(100)它时，会出现编译时错误。如何在不声明另一个短变量的情况下设置短值？
When setting Longvalue I can use setLongValue(100L)and it works. So, what does Lmean here and what's the character for Shortvalue?
设置Long值时我可以使用setLongValue(100L)并且它有效。那么，L这里的含义是什么，Short价值的特征是什么？
Thanks
谢谢
采纳答案by Lauri
In Java, integer literals are of type int by default. For some other types, you may suffix the literal with a case-insensitive letter like L, D, Fto specify a long, double, or float, respectively. Note it is common practice to use uppercase letters for better readability.
在 Java 中，整数文字默认为 int 类型。对于其他一些类型，您可以使用不区分大小写的字母作为后缀，例如L, D，F以分别指定 long、double 或 float。请注意，通常的做法是使用大写字母以提高可读性。
The Java Language Specification does not provide the same syntactic sugar for byte or short types. Instead, you may declare it as such using explicit casting:
Java 语言规范没有为字节或短类型提供相同的语法糖。相反，您可以使用显式转换来声明它：
byte foo = (byte)0;
short bar = (short)0;
In your setLongValue(100L)method call, you don't have to necessarily include the Lsuffix because in this case the int literal is automatically widened to a long. This is called widening primitive conversion in the Java Language Specification.
在您的setLongValue(100L)方法调用中，您不必包含L后缀，因为在这种情况下，int 文字会自动扩展为 long。这在 Java 语言规范中称为扩展原语转换。
回答by Lawrence Dol
You can use setTableId((short)100). I think this was changed in Java 5 so that numeric literals assigned to byte or short and within range for the target are automatically assumed to be the target type. That latest J2ME JVMs are derived from Java 4 though.
您可以使用setTableId((short)100). 我认为这在 Java 5 中已更改，以便分配给 byte 或 short 并且在目标范围内的数字文字会自动假定为目标类型。不过，最新的 J2ME JVM 源自 Java 4。
回答by er4z0r
There is no such thing as a byte or short literal. You need to cast to short using (short)100
没有字节或短文字这样的东西。您需要使用(short)100
回答by matt burns
Generally you can just cast the variable to become a short.
通常，您可以将变量强制转换为short.
You can also get problems like this that can be confusing. This is because the +operator promotes them to an int
您也可能会遇到此类令人困惑的问题。这是因为+运营商将他们提升为int
Casting the elements won't help:
铸造元素无济于事：
You need to cast the expression:
您需要转换表达式：
