What is Super Class, Base Class and String Class

Super Class

Super or parent class is a class which properties are inherited by some other class. Object class is a super class, which is inherited by all the class by default. Exists in java.lang package. To inherit the properties of super class we need to use extends keyword like below:

class Lcd extends Television{

}

In real world, we can take example of Television. The basic television has minimum a screen, remote, speaker etc. There are so many types of televisions like LED, LCD, Smart, 3D etc. All are these are television because they inherit the property of television.

Base Class

Sub or child class is a class which inherits the properties of Super class. Like LED, LCD etc are child class of television and television is super class of LED and LCD.

class Lcd extends Television{

}

String Class

String class is a mutable class. Which is use to store any type of value or sequence of characters as String object. String uses char array to store string values. Value of string always in between inverted commas (“”).

class LCD extends Television{

String channelName = “MTV” ;

}

Now, we have learned all the basics of a java program. Let’s develop a program.

class Television{

int numOfChannels = 10; //instance variable

String channelName = “Mtv”; //instance variable

//Class method

public static void main(String[] args){

System.out.println(“Number of channels ”+ numOfChannels);

System.out.println(“Name of channels ”+ channelName);

}

}