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Declaring a Class

Java Code:

class ClassName{
  ...code...
}

Declaring a Class with Parent

Java Code:

class ClassName extends parentClassName{
  ...code...
}

Declaring a class with Interface

Java Code:

class ClassName implements interface1, interface2, interface3{
   ...code...
}

Declaring a Class with Fields

Java Code:

class ClassName{
  public

...

Updated 10-18-2012 at 12:30 AM by penguinCoder

Tags: cheat sheet, class, constructor, examples, method

Categories

Cheat Sheet

Constructors are used for initialization normally. Name of constructor should be same as that of the class. If no constructor is declared, a default constructor is created without parameters. Constructor does not return any thing.

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Consider the example below. ClassB inherits from ClassA. In the MainClass, we made an object of ClassB. Default constructor will be called. But the output suggests that first Constructor of ClassA is called and then the constructor of classB is called. ...

Tags: constructor, default, initialization

Categories

Java SE