Compiler error: "class, interface, or enum expected"

In Java sometimes we get an error as when we creating a new class in the project or modifying the existing class content.

There are many cases when we get this error

1) Misplaced Curly Braces 

public class Test {
    public static void main(String args[]) {
      System.out.println("Hello World!!");
    }

}

Test.java:6: error: class, interface, or enum expected
}
^
1 error

there is missing "}" curly brace in the last line which results in a compilation error. If we remove it, then the code will compile.

2) A missing class declaration 

import java.util.Random;

public static void addCustomer(String args[])
{
    // a bunch of code
}

so here we missed the class declaration.

public class Customer{
   public static void addCustomer(String args[]){ ... }
}

3) Method defined outside the class 

public class Test {
    public static void main(String args[]) {
        //a bunch of code
    }
}
public static void display() {
    System.out.println("Hello World!!");
}

Every method should be within a class. Your method display() is outside a class. 

public class ClassName {

 ///your methods
}

If we put the method inside the class, then the code will compile. 

public class Test {
    public static void main(String args[]) {
        public static void display() {
        System.out.println("Hello World!!");
       }
    }
}

That's it!! We have seen why the error "the class, interface, or enum expected" occurred while writing code in java and seen the possible solutions to fix it.