java java中extern的等效关键字是什么？

What is the equivalent keyword for extern in java?

提问by Thangaraj

I have one public static variable in one file and how can I export the same variable to other files?

我在一个文件中有一个公共静态变量，如何将相同的变量导出到其他文件？

For ex:-

例如：-

file1.java

文件1.java

public final static int buf = 256;

file2.java

文件2.java

How can I access the variable "buf" in this file?

如何访问此文件中的变量“buf”？

回答by Bozho

File1.buf. More generally: ClassName.FIELD_NAME. A few notes

File1.buf. 更一般地说：ClassName.FIELD_NAME。一些注意事项

• use CAPITAL_LETTERSto name your static final fields (BUF)
• use static finalrather than final static(not crucial, but it is a widely accepted style)

• 用于CAPITAL_LETTERS命名您的静态最终字段 ( BUF)
• 使用static final而不是final static（不重要，但它是一种被广泛接受的风格）

回答by Saher Ahwal

File1.buf

correct definition: public static final int BUF = 256;

正确定义： public static final int BUF = 256;

so you would call it in other class:

所以你会在其他类中调用它：

File1.BUF;