Compile time checking test

import java.util.ArrayList;
import java.util.List;
 
/**
 * This class is used to show the compile time checking test.
 * @author w3schools
 */
public class GenericsTest {
	public static void main(String args[]){
		//Arraylist without generics.
		List list1 = new ArrayList();
		list1.add("Roxy");
		list1.add("Sandy");
		//No compile time error here 
		//because no compile time checking is done. 
		list1.add(new Integer(6));
 
		//Arraylist with generics.	
		List<String> list2 = new ArrayList<String>();
		list2.add("Roxy");
		list2.add("Sandy");
		//Compile time error here 
		//because we are adding a integer 
		//in the string array list. 
		list2.add(new Integer(6));
	}
}

import java.util.ArrayList; import java.util.List; /** * This class is used to show the compile time checking test. * @author w3schools */ public class GenericsTest { public static void main(String args[]){ //Arraylist without generics. List list1 = new ArrayList(); list1.add("Roxy"); list1.add("Sandy"); //No compile time error here //because no compile time checking is done. list1.add(new Integer(6)); //Arraylist with generics. List<String> list2 = new ArrayList<String>(); list2.add("Roxy"); list2.add("Sandy"); //Compile time error here //because we are adding a integer //in the string array list. list2.add(new Integer(6)); } }

Exception in thread "main" java.lang.Error: 
Unresolved compilation problem: 
The method add(String) in the type List<String> 
is not applicable for the arguments (Integer)
at com.w3schools.business.GenericsTest.main
(GenericsTest.java:27)

Exception in thread "main" java.lang.Error: Unresolved compilation problem: The method add(String) in the type List<String> is not applicable for the arguments (Integer) at com.w3schools.business.GenericsTest.main (GenericsTest.java:27)