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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		MyClass mc = new MyClass();
	}
}
 
class MyClass {
	System.out.println("HELLO!")
}

Main.java:17: error: <identifier> expected
	System.out.println("HELLO!")
	                  ^
Main.java:17: error: illegal start of type
	System.out.println("HELLO!")
	                   ^
Main.java:17: error: ';' expected
	System.out.println("HELLO!")
	                            ^
3 errors

Standard output is empty