我如何在Java中实现协作? [英] How do I formate in Java ?

问题描述

请..

我如何在Java中实现协作?

例如C ++中的 setw()

Please ..

How do I formate in Java ??

Such as setw () in C++

推荐答案

NumberFormat是您要搜索的内容:

使用Java格式化 [

NumberFormat is what you are searching for:

Formatting in Java[^]

我通常使用静态方法String.格式().如果您熟悉C printf()，则可以立即使用它，因为它的工作方式相同.
示例:
格式化的字符串= String.format(名称:％-20s年龄:％10d"，nameString，ageInt);

在上面的示例中，姓名的宽度将至少为20个字符，年龄的宽度将为10个字符，并在需要时用空格填充. -"字符表示如果nameString的宽度小于20个字符，则我们希望将其保留在左侧.

刚刚尝试可以将％s用于任何类型，java执行到字符串的转换.不过，如果要对整数％09d进行零前缀填充，或者要为浮点数指定精度，则可能要使用％d或％f:％10.3f

I usually use the static method String.format() for that. If you are familiar with the C printf() you can use this immediately because it works the same way.
Example:
String formatted = String.format("name: %-20s age: %10d", nameString, ageInt);

In the above example the width of name will be at least 20 characters and the width of age will be 10 characters, padded with spaces if needed. The ''-'' character means that if the width of nameString is less than 20 characters then we want to aling it to the left side.

Just tried out that you can use %s for any type, java performs the conversion to string. Still, you might want to use %d or %f if you want for example zero prefix padding for integers %09d or want to specify the precision for floats: %10.3f

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