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// Java program to illustrate the
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// concept of inheritance
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// from G4G
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// base class
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class Bicycle
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{
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// the Bicycle class has two fields
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public int gear;
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public int speed;
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// the Bicycle class has one constructor
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public Bicycle(int gear, int speed)
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{
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this.gear = gear;
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this.speed = speed;
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}
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// the Bicycle class has three methods
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public void applyBrake(int decrement)
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{
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speed -= decrement;
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}
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public void speedUp(int increment)
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{
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speed += increment;
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}
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// toString() method to print info of Bicycle
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public String toString()
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{
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return(“No of gears are “+gear
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+“n“
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+ “speed of bicycle is “+speed);
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}
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}
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// derived class
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class MountainBike extends Bicycle
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{
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// the MountainBike subclass adds one more field
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public int seatHeight;
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// the MountainBike subclass has one constructor
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public MountainBike(int gear,int speed,
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int startHeight)
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{
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// invoking base-class(Bicycle) constructor
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super(gear, speed);
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seatHeight = startHeight;
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}
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// the MountainBike subclass adds one more method
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public void setHeight(int newValue)
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{
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seatHeight = newValue;
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}
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// overriding toString() method
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// of Bicycle to print more info
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@Override
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public String toString()
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{
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return (super.toString()+
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“nseat height is “+seatHeight);
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}
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}
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// driver class
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public class Test
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{
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public static void main(String args[])
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{
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MountainBike mb = new MountainBike(3, 100, 25);
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System.out.println(mb.toString());
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}
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}
