constructors in java ppt
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This document summarizes constructors in Java. Constructors are methods that have the same name as the class and are executed during object creation. Constructors do not have a return type. Constructors are categorized as having no parameters, parameters, or being a default constructor added by the compiler. Constructors without parameters are called with the new keyword, while parameterized constructors pass arguments to the constructor. Default constructors are added by the compiler if no other constructor is defined.
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![Constructor without parameter
The constructor which are declared without parameter are known as
zero parameter constructor or constructor without parameter .
Example :-
class cTest ()
{
cTest()
{
sop(“---- cons----”);
}
}
class mains
{
psvm(string args[])
{
cTest ob=new cTest();
}](https://image.slidesharecdn.com/rahulsir-190112125359/85/constructors-in-java-ppt-4-320.jpg)
![Constructor with parameter
Constructor which are declared with parameter are known as
parametrized consrtructor or constructor with parameter.
Example:-
class cTest
{
cTest( int x)
{
sop(“the value is x:”+x);
}
}
class mains
{
Psvm(stringargs[])
{
cTest ob=new cTest( 10 );
cTest](https://image.slidesharecdn.com/rahulsir-190112125359/85/constructors-in-java-ppt-5-320.jpg)
![Default constructor.
They are the constructor without parameter which are added
to class at compilation stage by the compiler is known as
Default constructor .
Example :-
class cTest
{
}
class mains
{
Psvm(string args[])
{
cTest ob=new cTest();
}
}](https://image.slidesharecdn.com/rahulsir-190112125359/85/constructors-in-java-ppt-6-320.jpg)
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constructors in java ppt
- 2. CONSTRUCTORS IN JAVA Constructors is a method having the same name of the class and executed while while object creation . Return type is not used while constructor declaration because constructor have class return type by default . Syntax:- class – Name (para _ list) { //method body; }
- 3. Based on the parameters the constructors are categorised into two types :- (a) Constructor without parameters (b) Constructor with parameters (c) Default constructor
- 4. Constructor without parameter The constructor which are declared without parameter are known as zero parameter constructor or constructor without parameter . Example :- class cTest () { cTest() { sop(“---- cons----”); } } class mains { psvm(string args[]) { cTest ob=new cTest(); }
- 5. Constructor with parameter Constructor which are declared with parameter are known as parametrized consrtructor or constructor with parameter. Example:- class cTest { cTest( int x) { sop(“the value is x:”+x); } } class mains { Psvm(stringargs[]) { cTest ob=new cTest( 10 ); cTest
- 6. Default constructor. They are the constructor without parameter which are added to class at compilation stage by the compiler is known as Default constructor . Example :- class cTest { } class mains { Psvm(string args[]) { cTest ob=new cTest(); } }