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Default Constructor will be called first . If you override Validate method , then validate method will be called .

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โˆ™ 2012-09-14 12:29:51
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Q: What is first call in struts2 default constructor or validate method?
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Are you required to write a constructor method for a class?

No. If you do not write a constructor for you classes, the default Object constructor can still be used.


Which key word is used as constructor in c plus plus?

There is no specific keyword for a constructor in C++. Simply define and declare a method of the class with the same name as the class and it will be a constructor. A constructor with no arguments is the default constructor, a constructor with one argument of class type is the copy constructor, and a constructor with one argument of some other type is the conversion constructor. You can provide other overloaded constructors if you want.


What are default constructors as used in java programming?

If you don't type a constructor into your class code, a default constructor will be automatically generated by the compiler. The default constructor is ALWAYS a no-arg constructor. (Obviously the compiler has no clue what all arguments you might want for your class. So it takes the safe way out with a no argument constructor)Determine Whether a Default Constructor Will Be CreatedThe following example shows a Lamborghini class with two constructors:class Lamborghini {Lamborghini() { }Lamborghini(String name) { }}Will the compiler put in a default constructor for the class above? "No!" What about for the following variation of the class?class Lamborghini {Lamborghini(String name) { }}Now will the compiler insert a default constructor? "No Again!" What about this class?class Lamborghini { }Now we're talking. The compiler will generate a default constructor for the preceding class, because the class doesn't have any constructors defined. OK, what about this one below?class Lamborghini {void Lamborghini() { }}You might be tempted to say that, the compiler won't create one, since there already is a constructor in the Lamborghini class? Take another look at the Lamborghini class.What's wrong with the Lamborghini() constructor? It isn't a constructor at all! It's simply a method that happens to have the same name as the class. Remember, the return type is a dead straight way to tell us that we're looking at a method, and not a constructor. So, here again the compiler will put the default no-arg constructor in the class.


What is a no args constructor?

a constructor that does not accept any arguments. Parameterized constructor - a constructor that accepts arguments. Default Constructor - a constructor that is automatically created by the Java compiler if it is not explicitly defined. To learn more about data science please visit- Learnbay.co


Is Java always provides a default constructor to a class?

Determine Whether a Default Constructor Will Be CreatedThe following example shows a Lamborghini class with two constructors:class Lamborghini {Lamborghini() { }Lamborghini(String name) { }}Will the compiler put in a default constructor for the class above? "No!" What about for the following variation of the class?class Lamborghini {Lamborghini(String name) { }}Now will the compiler insert a default constructor? "No Again!" What about this class?class Lamborghini { }Now we're talking. The compiler will generate a default constructor for the preceding class, because the class doesn't have any constructors defined. OK, what about this one below?class Lamborghini {void Lamborghini() { }}You might be tempted to say that, the compiler won't create one, since there already is a constructor in the Lamborghini class? Take another look at the Lamborghini class.What's wrong with the Lamborghini() constructor? It isn't a constructor at all! It's simply a method that happens to have the same name as the class. Remember, the return type is a dead straight way to tell us that we're looking at a method, and not a constructor. So, here again the compiler will put the default no-arg constructor in the class.


What is a constructor and its mandatory to use constructor in a class?

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.


What is the method of constructor overloading in c plus plus?

You overload a constructor by declaring two or more constructors in a class, each with different signatures. When no constructor is specified, a default constructor and a copy constructor are implied. Both can be overridden. The default constructor can also be overloaded if all arguments are given default values in the declaration. You can add as many construction overloads as required in order to initialise your class. If your class has many members to initialise, it may be helpful to use a structure and an overloaded constructor to accept the structure. For every constructor that has exactly one argument, there should also be an equivalent assignment operator overload. The copy constructor assignment overload is implied if not specified.


Can Explain with an example to the default constructor?

The following example shows a Lamborghini class with two constructors: class Lamborghini { Lamborghini() { } Lamborghini(String name) { } } Will the compiler put in a default constructor for the class above? "No!" What about for the following variation of the class? class Lamborghini { Lamborghini(String name) { } } Now will the compiler insert a default constructor? "No Again!" What about this class? class Lamborghini { } Now we're talking. The compiler will generate a default constructor for the preceding class, because the class doesn't have any constructors defined. OK, what about this one below? class Lamborghini { void Lamborghini() { } } You might be tempted to say that, the compiler won't create one, since there already is a constructor in the Lamborghini class? Take another look at the Lamborghini class. What's wrong with the Lamborghini() constructor? It isn't a constructor at all! It's simply a method that happens to have the same name as the class. Remember, the return type is a dead straight way to tell us that we're looking at a method, and not a constructor. So, here again the compiler will put the default no-arg constructor in the class.


How does constructor differ from method?

A constructor is a special method that gets executed when the object is created.


Is constructor overloading same as method overloading.yes or no. explain?

yes,because in constructor overloading constructor have same and different parameter list. In method overloading method have same name and different parameter list.


What is constructor and discuss different types of constructor with syntax and examples?

A constructor is a class method which initialises an object of the class at the point of instantiation. Specifically, it initialises the base classes (if any) and the non-static data members (if any). Constructors also play a central role in the resource acquisition is initialisation (RAII) paradigm. Objects which have a natural default value have a default constructor. The default constructor is a constructor that has no arguments or where all arguments have default values. Objects which can be copied have a copy constructor. The copy constructor has just one non-default argument, a const l-value reference of the same type as the class. Objects which can be moved have a move constructor. The move constructor has just one non-default argument, a modifiable r-value reference of the same type as the class. All other constructors that have only one argument of a type other than the class itself are known as conversion constructors. Constructors can also have more than one argument. No specific name is given to these constructors. Other than physical memory constraints, there is no limit to the number of constructors that may be defined for a class.


What is the method of constructor overloading?

The first thing to note about constructor overloading is that Java creates a no argument constructor for you if and only if you have not typed a constructor yourself. Every class has a constructor even abstract ones (default no argument constructor). Abstract constructors are always executed. To overload a constructor you can do the following: class Test { String name; Test(String n) { name = n; System.out.println("Constructing Test Object named: " + name); } } In the case above we are overloading the default no argument constructor with a constructor that takes a String parameter. You can write you own no argument constructor as follows: class Test { Test() { System.out.println("Constructing Test Object"); } } To override our own no argument constructor we do this: class Test { Test() { // our no argument constructor System.out.println("Constructing Test Object"); } String name; Test(String n) { // overloading our no argument constructor with this // constructor that take a String parameter name = n; System.out.println("Constructing Test Object named: " + name); } }

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