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Compile time checking test


Let us see the compile time checking in java test with the below example.

Generics compile time checking example:

GenericsTest.java

import java.util.ArrayList;
import java.util.List;
 
/**
 * This class is used to show the compile time checking test.
 * @author codesjava
 */
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));
	}
}

Output:

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.codesjava.business.GenericsTest.main
(GenericsTest.java:27)

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Previous Topic: Generics terms and naming convention.

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