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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 class A implements Function<String, String>, Formattable {
 
   public String apply(String input) {
  return input.toString();
} 
 
} 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
 
System.out.println(new A() );
	}
}

Main.java:11: error: cannot find symbol
public class A implements Function<String, String>, Formattable {
                          ^
  symbol:   class Function
  location: class Ideone
Main.java:11: error: Ideone.A is not abstract and does not override abstract method formatTo(Formatter,int,int,int) in Formattable
public class A implements Function<String, String>, Formattable {
       ^
Main.java:22: error: non-static variable this cannot be referenced from a static context
System.out.println(new A() );
                   ^
3 errors

Standard output is empty