无法在java中创建公共静态final String(Can't create a public static final String in java)

无法在java中创建公共静态final String(Can't create a public static final String in java)

这段代码：

public class CommandPrompt { public static void main(String[] args) { public static final String prompt = System.getProperty("user.name")+">"; System.out.println(prompt); } }

返回此错误消息：

CommandPrompt.java:5: error: illegal start of expression public static final String prompt = System.getProperty("user.name")+">"; ^ CommandPrompt.java:5: error: illegal start of expression public static final String prompt = System.getProperty("user.name")+">"; ^ CommandPrompt.java:5: error: ';' expected public static final String prompt = System.getProperty("user.name")+">"; ^ 3 errors

我之前看过public static final String ，为什么我不能在这里使用它？

This code:

public class CommandPrompt { public static void main(String[] args) { public static final String prompt = System.getProperty("user.name")+">"; System.out.println(prompt); } }

Returns this error message:

CommandPrompt.java:5: error: illegal start of expression public static final String prompt = System.getProperty("user.name")+">"; ^ CommandPrompt.java:5: error: illegal start of expression public static final String prompt = System.getProperty("user.name")+">"; ^ CommandPrompt.java:5: error: ';' expected public static final String prompt = System.getProperty("user.name")+">"; ^ 3 errors

I have seen public static final String been used before, why can't I use it here?

最满意答案

说明

您不能在方法中使用public和static 。 两者都保留用于类属性： public是访问修饰符 ， static声明类范围的变量。

更正

public class CommandPrompt { public static void main(String[] args) { final String prompt = System.getProperty("user.name")+">"; System.out.println(prompt); } }

要么

public class CommandPrompt { public static final String prompt = System.getProperty("user.name")+">"; public static void main(String[] args) { System.out.println(prompt); } }

相关问题

如何在main方法中声明一个静态变量？

Explanation

You can't use public and static inside a method. Both are reserved for class attributes: public is an access modifier and static declares a class scoped variable.

Correction

public class CommandPrompt { public static void main(String[] args) { final String prompt = System.getProperty("user.name")+">"; System.out.println(prompt); } }

or

public class CommandPrompt { public static final String prompt = System.getProperty("user.name")+">"; public static void main(String[] args) { System.out.println(prompt); } }

Related question

How do I declare a static variable inside the main method ?