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SCJP 5.0 Generics Mock Exam Questions - 4

3)What is the output of the following program

  public class Gen<G>
   {
        G g;
        Gen(G g)
        {
            this.g =g;
        }
        public static void main(String[] args)
        {
            Gen<String> arr[] = new Gen[5];                   //line 1
            arr[0] = new Gen("Java");                            //line 2
            arr[1] = new Gen(1);                                  //line 3
            arr[2] = (Gen<String>)new Gen(1);               //line 4
            arr[3] = (Gen<String>)new Gen<Integer>(1);  //line 5
            for(Gen o:arr)
            {
                   System.out.println(o);
            }
        } 
 } 

a)Compile time Error at line 1
b)Compile time Error at line 3
c)Compile time Error at line 4
d)Compile time Error at line 5
e)Run Time Error

Answer

3) d.
We can cast raw type to specific type but we cannot type cast Integer type to String type

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