Thread: Having a trouble Making a program

Hello everyone

i came here seeking help on doing some program about bicycles for the university..
and asked

Write a TestBikes Main Class that will declare array of bikes of type Bicycle of size 6. Fill it with 6 objetcs of different types that the user will decide. Allow the user to speed up or slow down the speed of any object of his/her choice. Allow the user to get or set any attribute of any object of his/her choice. The attributes of these objects are entered by the user. Then, print the description of all bikes.

i made all the classes, i just don't know how to make the main method properly, here is my code:

 
import java.util.*;
 
abstract public class Bicycle {
 
 
 
    protected int startCadence;
    protected int startSpeed;
    protected int startGear;
 
    public Bicycle (int startCadence,int startSpeed, int startGear){
        this.startCadence = startCadence;
        this.startSpeed = startSpeed;
        this.startGear = startGear;
    }
 
    public int getStartCadence() {
        return startCadence;
    }
 
    public void setStartCadence(int startCadence) {
        this.startCadence = startCadence;
    }
 
    public int getStartGear() {
        return startGear;
    }
 
    public void setStartGear(int startGear) {
        this.startGear = startGear;
    }
 
    public int getStartSpeed() {
        return startSpeed;
    }
 
    public void setStartSpeed(int startSpeed) {
        this.startSpeed = startSpeed;
    }
 
       public void applyBrake(int slower){
//will decrement the speed by slower
       }
 
       public void speedUp(int faster){
//) will increment the speed by faster
       }
       public void printDescription(){
           System.out.println("Bike is in gear this.gear with a caence of this.cadence and travelling at a speed of this.speed");
       }
       }

public class RoadBike extends Bicycle{
 
    private int tireWidth;
 
    public RoadBike(int tireWidth, int startCadence, int startSpeed, int startGear) {
        super(startCadence, startSpeed, startGear);
        this.tireWidth = tireWidth;
    }
 
    public int getTireWidth() {
        return tireWidth;
    }
 
    public void setTireWidth(int tireWidth) {
        this.tireWidth = tireWidth;
    }
 
public void printDescription(){
 
}
}

 
public class MountainBike extends RoadBike{
 
    private String suspension;
    private int seatHeight;
 
    public MountainBike(String suspension, int seatHeight, int tireWidth, int startCadence, int startSpeed, int startGear) {
        super(tireWidth, startCadence, startSpeed, startGear);
        this.suspension = suspension;
        this.seatHeight = seatHeight;
    }
 
    public int getHeight() {
        return seatHeight;
    }
 
    public void setHeight(int seatHeight) {
        this.seatHeight = seatHeight;
    }
 
    public String getSuspension() {
        return suspension;
    }
 
    public void setSuspension(String suspension) {
        this.suspension = suspension;
    }
public void printDescription(){
 
 
}
 
 
 
 
    }

main class

package assignment_3;
 
import java.util.Scanner;
 
 
public class TestBikes {
    public void main (String [] args){
 
        Scanner scan = new Scanner (System.in);
        String[]ar = new String [6];
    }
}

as you see i'm not good at connecting classes and using them in the main class


much appreciated any help and thank you

Please edit your post above and change all [quote] [/quote] tags that are surrounding code blocks to [code] [/code] tags so that we can read your code.

Alright, done

You should not try to solve everything all at once, and I would instead break the problem down into smaller steps and try to solve each step one at a time. These steps can include (but are not limited to):

1. prompting the user for information
2. this includes asking the user what type of Bicycle to create, speed, etc...
3. using that information to create your Bicycle subclass objects
4. Placing the objects into the array
5. Trying to run the program to see what will happen.

Then if you're stuck on a single step, show us your code attempt for that step and ask your questions.

Originally Posted by curmudgeon

You should not try to solve everything all at once, and I would instead break the problem down into smaller steps and try to solve each step one at a time. These steps can include (but are not limited to):

1. prompting the user for information
2. this includes asking the user what type of Bicycle to create, speed, etc...
3. using that information to create your Bicycle subclass objects
4. Placing the objects into the array
5. Trying to run the program to see what will happen.

Then if you're stuck on a single step, show us your code attempt for that step and ask your questions.

I'm trying to do that, but i'm not good at making programs with subclasses, i have little knowledge in them and our teacher isn't that good at explanation.
I'm good doing java in 1 class which we took in last year
i have to submit this program by tonight.

if someone can tell me the codes i should put in the main method so it become complete
please help

Originally Posted by ZeraX

I'm trying to do that, but i'm not good at making programs with subclasses, i have little knowledge in them and our teacher isn't that good at explanation.
I'm good doing java in 1 class which we took in last year
i have to submit this program by tonight.

You get good by practice.

if someone can tell me the codes i should put in the main method so it become complete
please help

This is not allowed nor appreciated here. Please refrain for asking others to do your homework lest we close this question and ban you from the forum. Again, I suggest that you give it your best try, either that or point out exactly what specific questions you may have.

Woah, i asked for help in writing some codes, not asking for doing my whole homework, considering i wrote everything else except not implementing the proper driver class.
this is java not math problem so i create out of mind non-exist methods to solve it.

all i want is someone guiding me how to make the main method use its subclasses.

and this is how i got far, i even forgot how to put the values into the array

public class TestBikes {
    public void main (String [] args){
 
        Bicycle []bi = new Bicycle[6];
 
 
        Scanner scan = new Scanner (System.in);
        String ar[] = new String [6];
        double speed=100;
 
        for(int j=0;j< ar.length;j++){
        for(int i=0; i<6 ; i++){
        System.out.println("This is the first bike, speed is 100, if you to increase (i) or decrease it (d) ?");
        String ans = scan.nextLine();
        if(ans.equalsIgnoreCase("i")){
            speed ++;
 
        }
           if(ans.equalsIgnoreCase("d")){
               speed--;
 
        }

You will want to make sure that your code is indented well -- that each block is indented a standard amount, say 3 spaces, and that the indentation amount is consistent, else it will be very hard for us to understand your code and you to be able to debug it later. For instance, you have nested for loops but have not indented the inner loop.

So you know that you will need a for loop that loops bi.length times in order to put a new Bicycle into the array. So I see that you have this, but I'm not sure what the purpose of your inner for loop is, why you need it and what you're going to do with it. Inside of that for loop, you will want to send prompts to the user, first to select what type of Bicycle subclass he desires, then what speed he desires, than an other thing he desires. Then you'll want to create one of the subclasses depending on his choice and then modify its properties using the Bicycle setter methods, then put it into the array.

So in pseudocode:

for loops from i = 0 to i < length of bi array
  Prompt user for what type of Bicycle they want
  Using if/else blocks or switch/case block, create an object of the type they desire
  Prompt user for modifications to this Bicycle
  Using setter methods update the properties of this Bicycle
  Add Bicycle to the ith item in the bi array.
end for loop