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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
	{
		Set set = new HashSet();
		set.add(new Model());
 
		for (Model model : set) {
			System.out.println("1");
		}
	}
}
 
class Model {
 
}

Main.java:15: error: incompatible types: Object cannot be converted to Model
		for (Model model : set) {
		                   ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

Standard output is empty