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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. */
 
  public class Ideone
{
    {
     final Vector v;
    v=new Vector();
    }
    public Ideone ()
 {
 }
    public void codeMethod() 
    {
    System.out.println(v.isEmpty());
    }
    public static void main(String args[]) 
   { 
new Ideone().codeMethod(); 
} 
}

Main.java:9: error: class Ideone is public, should be declared in a file named Ideone.java
  public class Ideone
         ^
Main.java:20: error: cannot find symbol
    System.out.println(v.isEmpty());
                       ^
  symbol:   variable v
  location: class Ideone
2 errors

Standard output is empty