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Core Java - Interview Questions and Answers for 'Default value' - 5 question(s) found - Order By Newest

 Q1. What are the default or implicitly assigned values for data types in java ?
Anonymous
Ans. boolean ---> false
byte ----> 0
short ----> 0
int -----> 0
long ------> 0l
char -----> /u0000
float ------> 0.0f
double ----> 0.0d
any object reference ----> null

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   Like         Discuss         Correct / Improve     java   data types   default values

Try 1 Question(s) Test


 Q2. Why do member variables have default values whereas local variables don't have any default value ?
Core Java
Anonymous
Ans. member variable are loaded into heap, so they are initialized with default values when an instance of a class is created. In case of local variables, they are stored in stack until they are being used.

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   Like         Discuss         Correct / Improve     java   jvm   memory management   variables   stack memory   heap memory   default values      expert


 Q3. Variable of the boolean type is automatically initialized as?Core Java
Admin
info@buggybread.com
Ans. The default value of the boolean type is false.

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   Like         Discuss         Correct / Improve     java   data type   boolean   initialization   default object construction   default constructor   default value


 Q4. What will be the output of following code ?

public static void main(String[] args)
{
int x = 10;
int y;
if (x < 100) y = x / 0;
if (x >= 100) y = x * 0;
System.out.println("The value of y is: " + y);
}
Admin
info@buggybread.com
Ans. The code will not compile raising an error that the local variable y might not have been initialized. Unlike member variables, local variables are not automatically initialized to the default values for their declared type.

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   Like         Discuss         Correct / Improve     java   code   default value


 Q5. What will we get if we try to print local variable that hasn't been initialized ?Core Java2017-04-04 14:40:31

Ans. It will print the garbage value as compiler doesn't provide a default value to local variables.

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   Like         Discuss         Correct / Improve     local variable  default values      basic


 Q6. What will be the output of following ?

public class BuggyBread {

   private int x;
   private Integer y;

   BuggyBread(int x,int y){};

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(1,2);
      System.out.println(buggybread.x);
      System.out.println(buggybread.y);
   }
}
Core Java
a. 0 0
b. 0 null
c. null 0
d. null null

Ans.b. 0 null


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