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Core Java - Interview Questions and Answers for 'Instance initialization block' - 2 question(s) found - Order By Newest

 Q1. What is the difference between constructor and instance initialization blocks ?Core Java2016-07-19 11:25:30

Ans. Constructor has the same name as class name whereas instance initialization block just have a body without any name or visibility type.

instance initialization blocks are useful if we want to have some code run regardless of which constructor is used or if we want to do some instance initialization for anonymous classes.

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 Q2. Is this code legal in Java ?

public class BuggyBread {
{
System.out.println("HelloWorld.");
}
}
2016-07-19 11:26:59

Ans. Yes, It's an instance initialization block.

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   Like         Discuss         Correct / Improve     code  instance initialization block

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Related Questions

  How does volatile affect code optimization by compiler?
  Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized
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1. new OuterClass().new InnerClass();

2. new OuterClass.InnerClass();
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 What is the difference between these two approaches of creating singleton Class ?

//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}
 What is the difference between following two segments of code

Code 1

int x = 4 * 3;
int y = x * 5;

Code 2

int y = 4 * 3 * 5;

 If arrays cannot be resized , Why is this code valid

String[] strArray = new String[2];
strArray = new String[5];


 Q3. What will be the output of executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
}
}
Core Java
a. Static Block
Main Method
b. Static Block
Instance Initialization Block
Main Method
c. Static Block
Constructor
Main Method
d. Static Block
Instance Initialization Block
Constructor
Main Method

Ans.a. Static Block
Main Method

 Q4. What will be the output upon executing following class ?

public class BuggyBread {

static {
System.out.println("Static Block");
}

{
System.out.println("Instance Initialization Block");
}

BuggyBread(){
System.out.println("Constructor");
}

public static void main(String[] args){
System.out.println("Main Method");
new BuggyBread();
}
}
Core Java
a. Instance Initialization Block
Constructor
Static Block
Main Method
b. Static Block
Instance Initialization Block
Constructor
Main Method
c. Main Method
Static Block
Instance Initialization Block
Constructor
d. Static Block
Main Method
Instance Initialization Block
Constructor

Ans.d. Static Block
Main Method
Instance Initialization Block
Constructor


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