How to declare instantiate java generic collect Yasser @Jobilize

Author: Yasser Ibrahim

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Question 75 / 297: What is the result of compiling and running the following program?

import java.util.ArrayList;
import java.util.List;

public class Tester {

	public static void main(String[] args) {
		
         List<String> list1 = new ArrayList<String>();//line 1
         List<Object> list2 = list1;//line 2
         list2.add(new Integer(12));//line 3
         System.out.println(list2.size());//line 4

	}
}

A Compilation error at line 1, must initialize the size

B Compilation error at line 2,Type mismatch, cannot convert from List<String> to List<Object>

C Compilation error at line 3, can add objects of type String only

D 1

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Explanation:

Type mismatch, can't convert from List<String> to List<Object>

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