JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Boolean Wrapper Class


Description:

The Boolean class wraps a value of the primitive type boolean in an object. An object of type Boolean contains a single field whose type is boolean.


List of Boolean wrapper class programs:

  1. How to create Boolean wrapper object?
  2. How to convert string to boolean value?
  3. Primitive boolean constants.
Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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