INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: what is the first statement in construtor?

Answer: The first statement of the constructor should be either a call to super() or this().
ex. class A{
A(){
super(); / this();
}
}

The first statement of the constructor should be either a call to super() or this().
ex. class A{
A(){
super(); / this();
}
}
Source: CoolInterview.com

There is nothing such like a first line in constructor.The constructor can include any initializations to be performed depending upon the parameters passed.The constructor may even contain no code at all.

For example,

public Bank()
{
}

This constructor initializes a class Bank for
no default values.This is called a empty constructor.

public Bank(double interest)
{
interestRate=interest;
}

This constructor intializes the interest rate
for the Bank Class.
Source: CoolInterview.com

super(); Source: CoolInterview.com

There is certainly first statemnt in the Constructor which should be Optionally Provided by You.

and It depends on mainly 2 Factors

1 Parent Class Exist for your base Class
2 you want bypass to some other Constructor in Your Base Class

Let me Explain the First Case
Having Parent class

Class SuperClass{
SuperClass(){}
SuperClass(int i,flaot b)
}

Class BaseClass extends SuperClass{

// say you have Constructor of No Arg then you will write

BaseClass(){
}
//In the Above Case if not super is Provided by you JVM will provide one for you and looks as below

BaseClass(){
super();
}


//and if you want to have argumented Consrtuctor then mandatorly you should place super() with argumnets

Baseclass(int a,float b){
super(a,b);
}

// now if you want call overloaded Constructor then you can use this()
BaseClass(int a,int b){
this(a,new Float(b))
}














}
Source: CoolInterview.com

the first statement of the constractors should be super or this or any local variable alse can be wrritten in the constractors. Source: CoolInterview.com

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