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Answered 2008-09-22 11:34:10

Constructors in java cannot be invoked explicitly. They are invoked automatically when an object is created. In java if u dont write any code for constructor, by default compiler inserts a zero argument constructor. If required, it can be overrided.

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No. Java does not support copy constructor


A JavaBean is nothing but a regular Java Class and hence it can be instantiated using the new keyword and invoking the bean constructor


When the programmer has not coded a constructor for any java class.


When any constructor is deffined in your class, the java compiler create a default no argument constructor for you. This constructor only have an invocation to the super class constructor (" super( ) ").


All Java programs would have a constructor... public class Test { public Test(){ ... } ..... } This is a constructor. Even if you dont code the constructor Java would automatically place a default constructor for compilation.


What are the importance of constructor in java? Constructor is automatically called immediately after the object is created , before the new operator complete . Constructor is important because they have no return type , not even void.


No. The constructor is the starting point of creation of any object in Java. Without going through a constructor you cannot create an object


Constructor is used to do something (written in constructor) immediately after object creation.


Default Constructor Parameterised Constructor Non Parameterised Constructor


In the case of Java, not always. The class does require a constructor, but the compiler will automatically include an "empty constructor" (constructor without parameters) under certain conditions.In the case of Java, not always. The class does require a constructor, but the compiler will automatically include an "empty constructor" (constructor without parameters) under certain conditions.In the case of Java, not always. The class does require a constructor, but the compiler will automatically include an "empty constructor" (constructor without parameters) under certain conditions.In the case of Java, not always. The class does require a constructor, but the compiler will automatically include an "empty constructor" (constructor without parameters) under certain conditions.


Objects are constructed. You can't make a new object without invoking a constructor. In fact, you can't make a new object without invoking not just the constructor of the object's actual class type, but also the constructor of each of its superclasses including the Object class itself! Constructors are the code that runs whenever you use the keyword new.


No. if you wish to create an object that you plan on using in a java program then the answer is NO. You cannot initialize an object of a Java class without calling the constructor.


It is the way to create the instances of class. in java. to know how constructor works first you should be clear with the concept of class.


method invoking refers to the action in which we call a Java method from within another java method or class. Method invocation is analogous to a function call in procedural programming.


When we want to create an Object for a class at that time we will write constructor.


if we write a code in java then we don't mansion a default constructor in it then compiler by default provide a default constructor and the main impotent role of default constructor in our program is that it initialize the member of the class then it is reason compiler provide a default constructor in our java program code .


Java, unlike C++ does not support copy constructors.


NO, we cannot create a contructor for an interface in java.


Constructor is not an alternative to class. In Java, you create classes; the classes contain methods - including the constructor, which can be viewed as a special method. If you want to have a constructor, you need a class that surrounds it, so it's not one or the other.


Objects are constructed. You can't make a new object without invoking a constructor. In fact, you can't make a new object without invoking not just the constructor of the object's actual class type, but also the constructor of each of its superclasses including the Object class itself! Constructors are the code that runs whenever you use the keyword new.


A parameterized constructor in java is just a constructor which take some kind of parameter (variable) when is invoked. For example. class MyClass { //this is a normal constructor public MyClass(){ //do something } //this is a parameterized constructor public MyClass(int var){ //do something } //this is another parameterized constructor public MyClass(String var, Integer var2){ //do something } }


A constructor is a method that is invoked when an object is created. As to being mandatory, that really depends on the programming language; in the case of Java, each class must have a constructor, however, in many cases Java will automatically provide a default constructor, so you don't really need to program it.


A Private constructor is simply a constructor that can only be used within the class it was declared in. By default java creates you a constructor which is public though. Hope that helps


Interfaces in Java can not define constructors.


To create objects of classes



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