1. Which of these is an incorrect array declaration?

1. 1. int arr[] = new int[5] ;

   
   
   

   2. int [] arr = new int[5] ;

   
   
   

   3. int arr[] = int [5] new;

   
   
   

   4. int arr[];
      arr = new int[5];

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Operator new must be succeeded by array type and array size. The order is important and determines the type of variable.

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2. What is the output of below snippet?
   

   
   Obj[] names = new String[10];
   name[0] = new Integer(0);
   

1. 1. ArrayIndexOutOfBoundsException

   
   
   

   2. Compilation Error

   
   
   

   3. Code runs successfully

   
   
   

   4. ArrayStoreException

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   ArrayIndexOutOfBoundsException comes when code tries to access an invalid index for a given array. ArrayStoreException comes when you have stored an element of type other than the type of array.

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3. What will this code print?
   

   
   int a[] = new int [10];
   System.out.print(a);
   

1. 1. Garbage value

   
   
   

   2. 00000

   
   
   

   3. value stored in arr[0].

   
   
   

   4. 0

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   arr is an array variable, it is pointing to array of integers. Printing arr will print garbage value. It is not same as printing arr[0].

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4. Generics does not work with?
   

1. 1. List
      

   
   
   

   2. Tree

   
   
   

   3. Array

   
   
   

   4. set

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Generics gives the flexibility to strongly typecast collections. Generics is applicable to Set, List and Tree. It is not applicable to Array.

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5. What is the type of variable ‘b’ and ‘d’ in the below snippet?
   

   
   int a[], b;
   int []c, d;
   

1. 1. ‘b’ and ‘d’ are int

   
   
   

   2. ‘b’ is int variable; ‘d’ is int array

   
   
   

   3. ‘d’ is int variable; ‘b’ is int array

   
   
   

   4. ‘b’ and ‘d’ are arrays of type int

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   If [] is declared after variable it is applicable only to one variable. If [] is declared before variable it is applicable to all the variables.

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