Two classes

This i my second Java class, and I must be missing some fundamental knowledge.

I have two classes. The main contains:

public class CarPartTest {

public static void main (String [] args) {

System.out.println("TESTING CarPart CLASS");

// instantiates two CarPart objects by calling parameter constructor
CarPart battery = new CarPart(3176, "battery", 15, 45.25);
CarPart ws = new CarPart(2745, "wind screen", 4, 175.60);

// 1. Testing object construction and print
System.out.println("\n1. Testing object construction and print ...");
System.out.print("Part data: ");
battery.print();

System.out.print("Part data: ");
ws.print();

My job is to write "a method print that writes out to the screen all car part's specific data" in another class. So far I had:

import java.io.*;
import java.awt.*;

public class CarPart {

int numItems;
int partID ;
String partName ;
int partStock ;
double partPrice ;

public CarPart() {

partID = 0;
String partName = "";
int partStock = 0;
double partPrice = 0;

} // end method CarPart

public String print(){
return partID;
return partName;
return partStock;
return partPrice;

} // end method print

For the print method is started out with:

import java.io.*;
import java.awt.*;

public class CarPart {

int numItems;
int partID ;
String partName ;
int partStock ;
double partPrice ;

public CarPart() {

partID = 0;
String partName = "";
int partStock = 0;
double partPrice = 0;

} // end method CarPart

public String print(){
return print;

} // end method print

which compiled fine but the instructor said was wrong.

I tried several other things, but nothing is working. Can anyone help?

which compiled fine but the instructor said was wrong.

You must not be showing us all of the code, because I don't see how some of methods could compile fine.

Henry

No, the entire code for the main method is:

public class CarPartTest {

public static void main (String [] args) {

System.out.println("TESTING CarPart CLASS");

// instantiates two CarPart objects by calling parameter constructor
CarPart battery = new CarPart(3176, "battery", 15, 45.25);
CarPart ws = new CarPart(2745, "wind screen", 4, 175.60);

// 1. Testing object construction and print
System.out.println("\n1. Testing object construction and print ...");
System.out.print("Part data: ");
battery.print();

System.out.print("Part data: ");
ws.print();

// 2. Testing class getters using the 'battery' object
System.out.println("\n2. Testing class getters using the 'battery' object ...");
int batID = battery.getPartID();
String batName = battery.getPartName();
int batStock = battery.getStock();
double batPrice = battery.getPartPrice();

System.out.print("Battery ID: ");
System.out.println(batID);

System.out.print("Battery name: ");
System.out.println(batName);

System.out.print("Battery stock: ");
System.out.println(batStock);

System.out.print("Battery price: ");
System.out.println(batPrice);

// 3. Testing addToStock
System.out.println("\n3. Testing addToStock...");
ws.addToStock(20);
System.out.print("Part data: ");
ws.print();

// 4. Testing remove (sell) 6 batteries (remove operation will be executed)
System.out.println("\n4. Testing remove (sell) 6 batteries - remove operation will be executed ...");
if(battery.removeFromStock(6)) {
System.out.print("The operation executed OK. Part data: ");
battery.print();
} else {
System.out.print("The operation could not be executed. Part data: ");
battery.print();
}

// 5. Testing remove (sell) 100 wind screens (the operation will not be executed)
System.out.println("\n5. Testing remove (sell) 100 wind screens - remove operation will not be executed ...");
if(ws.removeFromStock(100)) {
System.out.print("The operation executed OK. Part data: ");
ws.print();
} else {
System.out.print("The operation could not be executed. Part data: ");
ws.print();
}
}
}

I was referring to your CarPart class.

Henry

Oh, sorry, this is the entire code:

import java.io.*;
import java.awt.*;

public class CarPart {

int numItems;
int partID ;
String partName ;
int partStock ;
double partPrice ;

public CarPart() {

partID = 0;
String partName = "";
int partStock = 0;
double partPrice = 0;

} // end method CarPart

public String print(){
return CarPart();

} // end method print

public int getPartID() {
return partID ;
} // end method getPartID

public String getPartName(){
return partName;
} // end method getPartName

public int getStock() {
return partStock;
} // end method getStock

public double getPartPrice() {
return partPrice ;
} // end method getPartPrice

public void addToStock (int item) {
numItems = item ;

} // end method addToStock

public boolean removeFromStock (int item) {
boolean moreToSearch;
int location = 0;
boolean found = false;

moreToSearch = (location < numItems);

location++;

item = location - 1;
numItems--;

location++;

moreToSearch = (location < numItems);

return found;
} // end method removeFromStock

} //end class

From the main code, it looks like your car part print() method is supposed to print something. However, all it does it just return a String. Is it supposed to print the String instead?

Other than that, could you elaborate the problem that you are having?

Henry

When the CarPartTest is run, this is supposed to be the answer:

TESTING CarPart CLASS
1. Testing object construction and print ...
Part data: 3176, battery, 15, 45.25
Part data: 2745, wind screen, 4, 175.6
2. Testing class getters using the 'battery' object ...
Battery ID: 3176
Battery name: battery
Battery stock: 15
Battery price: 45.25
3. Testing addToStock...
Part data: 2745, wind screen, 24, 175.6
4. Testing remove (sell) 6 batteries � remove operation will be executed ...
The operation executed OK. Part data: 3176, battery, 9, 45.25
5. Testing remove (sell) 100 wind screens � remove operation will not be executed ...
The operation could not be executed. Part data: 2745, wind screen, 24, 175.6

I would suggest that you modify the print() to actually print the values instead of just returning itself.

Henry

And how might I do that.