Why Does My Java Compiler Show 'Error: class X is public, should be declared in a file named X.java'?

Class Public Declaration Error

Issue:

When attempting to compile a Java program, a compiler error is encountered: "Error: class X is public, should be declared in a file named X.java."

Cause:

This error occurs when the public class within a .java file does not match the file's name.

Resolution:

To resolve this issue, there are two options:

• Option 1: Rename the Java file to match the public class's name.

  • For example, if the public class is WeatherArray, rename the file to WeatherArray.java.

• Option 2: Rename the public class to match the file's name.

  • For example, if the file is named Main.java, rename the public class to Main.

Example Code:

Here is the corrected code:

// WeatherArray.java
public class WeatherArray {
    public static void main(String[] args) {
        // ...
    }
}

Alternatively:

// Main.java
public class Main {
    public static void main(String[] args) {
        // ...
    }
}

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