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SCJP 1.5 - Generics Mock Exam - 1

3.What is result of compiling and running the following code?

import java.util.*;
class Vehicle {}
class Car extends Vehicle {}
class Bus extends Vehicle {}
class TestSamp {
	public static void main(String [] args) {
	ArrayList<Car> a = new ArrayList<Car>();
	a.add(new Car());
	ArrayList b = a;
	ArrayList<Bus> c = (ArrayList<Bus>)b;
	c.add(new Bus());
	for (Object obj : b)
		System.out.println(obj);
	}
}

1. compiler error
2. compiles with warning and gives some output
3. compiles without warning and gives some output
4. copiles and run with no output

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Answer

3)3
ArrayList b = a; This assignment assigns a typesafe arraylist in to a non-typesafe arraylist, So this assignment causes warning during compilation.

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