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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
	{
	List<List> a = new ArrayList();
List<List<?>> b = new ArrayList();
 
a = b; // incompatible types
b = a; // incompatible types
	}
}

Main.java:15: error: incompatible types: List<List<?>> cannot be converted to List<List>
a = b; // incompatible types
    ^
Main.java:16: error: incompatible types: List<List> cannot be converted to List<List<?>>
b = a; // incompatible types
    ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors

Standard output is empty