3. What are all the default initialized values for java primitive data types?

Answer

Type of Element    Initial Value
byte                           0
short                          0
char                            '\u0000' ( unicode representation )
int                              0
long                           0L
float                           0.0f
double                        0.0d
boolean                      false
Object Reference       null

4. Select all the correct answers from the following ?
[a] An array can store many different types of values.
[b] An array subscript should normally be of 'double' data type.
[c] An array can store only same data type.
[d] An array can only stores objects

Answer
[c] An array can store only same data type.

5. What is the result when you compile and run the following program?
public class MyArray {
public static void main(String arg[]){
int myArray []= new int [10];
for (int i=0; i<myArray.length; i++) {
System.out.println(myArray[i]);
}
}
}

[a] Prints all 0's on the screen from 0 to 9 in sequence.
[b] Prints on the screen from 1 to 10 in sequence.
[c] Prints on the screen 0 only.
[d] Compile time error.

Answer

6. Which of the following is used to find the length of an array?
[a] arrayName.length;
[b] arrayName.length();
[c] arrayName.size();
[d] arrayName.size;

Answer