Abstract Classes and Methods (Java in a Nutshell)David FlanaganOreilly & Associates Inc
A Java application is implemented by one or more classes. Small applications can be accommodated by a single class, but larger applications often require multiple classes. In that case one of the classes is designated as themain classand contains themain()entry-point method. For example, Listing...
}// method 1publicStringgetName(){returnname; }// method 2publicStringgetBreed(){returnbreed; }// method 3publicintgetAge(){returnage; }// method 4publicStringgetColor(){returncolor; }@OverridepublicStringtoString(){return("Hi my name is "+this.getName() +".\nMy breed,age and colo...
In general, the code that you'll write and read involving inner classes will be "plain" inner classes that are simple and easy to understand. However, the syntax for inner classes covers a number of other, more obscure techniques. Inner classes can be created within a method or even an a...
You can also create an object of a class and access it in another class. This is often used for better organization of classes (one class has all the attributes and methods, while the other class holds themain()method (code to be executed)). ...
You might wish to make a method final if it has an implementation that should not be changed and it is critical to the consistent state of the object. For example, you might want to make the getFirstPlayer method in this ChessAlgorithm class final: class ChessAlgorithm { enum ChessPlayer ...
You can then invoke the instance method in the normal manner. Compile Listings 1 and 2 as follows: javac *.java When you compile an enclosing class that contains a static member class, the compiler creates a class file for the static member class whose name consists of its enclosing ...
Method Description public final byte[] computeKey(java.lang.String pin) Computes an encryption key from the specified pin. This method takes an arbitrary-length clear-text pin entered by the user and creates a fixed-length digest suitable for use by the encrypt and decrypt methods. public...
Here, we use the staticDouble.comparemethod that returns a negative if the first argument is less than the second argument,0if they are equal, and a positive value otherwise. CAUTION In the interface declaration, thecompareTomethod was not declaredpublicbecause all methods in aninterfaceare autom...
Let us apply all the above rules to create an immutable custom class. Notice that we arereturning a new copy ofArrayListfrom thegetTokens()method. By doing so, we are hiding the original tokens list so no one can even get a reference of it and change it. ...