JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Constructor Examples

  • Constructors are required to create objects for a class. Constructors are used to initialize the instance variables of an object.
  • Constructor declaration looks like method declaration. It must have the same name as that of the class and have no return type.
  • Constructors can be classified into two types, default constructors and parametarized constructors.
  • If you don't define a constructor, then the compiler creates a default constructor. Default constructors do not contain any parameters. Default constructors are created only if there are no constructors defined by us.
  • Prametarized constructors are required to pass parameters on creation of objects. We can overload constructors with different datatypes as its parameters.
  • Use 'this()' to communicate from one constructor to another constructor in the same class.
  • Use 'super()' to communicate with super class constructor.

Java Constructor Sample Code Examples

Knowledge Centre
Prevent a method from being overridden
By specifying final keyword to the method you can avoid overriding in a subcalss. Similarlly one can use final at class level to prevent creating subclasses.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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