Core Java - Interview Questions and Answers for 'Instance initialization blocks' | Search Interview Question

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

Q1. What is the difference between constructor and instance initialization blocks ?

Core Java

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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Related Questions

What are the common uses of "this" keyword in java ?

Can we use both "this()" and "super()" in a constructor ?

Why every object constructor automatically call super() in Object before its own constructors?

Can constructors be synchronized in Java ?

Does Constructor creates the object ?

What are constructors and Destructors in Java ?

Are constructors inherited? Can a subclass call the parent's class constructor? When?

Difference between object instantiation and construction ?

How can we create objects if we make the constructor private ?

Difference Between this() and super() ?

Q2. Is this code legal in Java ?

public class BuggyBread {
{
System.out.println("HelloWorld.");
}
}

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

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Related Questions

Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized

How does volatile affect code optimization by compiler?

Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

What is the difference between the following two code lines ?

1. new OuterClass().new InnerClass();

2. new OuterClass.InnerClass();

Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

If arrays cannot be resized , Why is this code valid

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

Will the static block be executed in the following code ? Why ?

If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?

Which of the following is not the advantage of Mocking frameworks ?

How can we make sure that a code segment gets executed even in case of uncatched exceptions ?

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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