Help with searching though a linked list given and displaying it given an integer.

[Nikolas Spendik]

Hey, i need help with a part of my program where I need to display an object, which is in a linked list, given a vin number. It is the display_info method. Any help is appreciated:) I have put two of my classes below.

Here is what i have so far:

import java.util.*;
public class Car implements Comparable<Car>, Cloneable
{

private String model;
private String color;
private int year;
private int vin_number;
private double price;



public Car(){}

public Car(String model, String color, int year, int vin_number, double price)
{
this.model = model;
this.color = color;
this.year = year;
this.vin_number = vin_number;
this.price = price;
}

public Object clone() { // shallow copy 
try
{
return super.clone();
} 
catch (CloneNotSupportedException e)
{ 
return null; 
}
 
}


public String getModel(){return model;} 
public String getColor(){return color;}
public int getYear(){return year;}
public int getVinNumber(){return vin_number;}
public double getPrice(){return price;}


public void setModel(String newModel){model = newModel;} 
public void setColor(String newColor){color = newColor;}
public void setYear(int newYear){year = newYear;}
public void setVinNumber(int newVinNumber){vin_number = newVinNumber;}
public void setPrice(double newPrice){price = newPrice;}

public String toString()
{
return "Model: " + model + " Color: " + color + " Year: " + year + " Vin Number: " + vin_number + " Price: " + price;
}


public int compareTo(Car car) {  
 
return car.getModel().compareTo(this.getModel()); //eg -1  

//return this.getModel().compareTo(car.getModel()); //reversing gives 1  
}  
public static void main(String [] args)
{

}


}

import java.util.Scanner;
import java.util.Collections;
import java.util.LinkedList;
import java.util.ListIterator;

public class CarLot
{

public static void sortCars(LinkedList someList)
{
 Collections.sort(someList);
 System.out.println(someList);
}


public static void displayInfo(LinkedList someList)
{
    System.out.println(someList);
    Scanner input = new Scanner(System.in);
    
    System.out.println("Enter a vin number:");
    int number = input.nextInt();
    
    for(int i = 0; i < someList.size(); i++)
    {
    if(number.equals(someList))
    {
    System.out.println(someList);
    break;
    }
    }
}

public static void addCar(LinkedList someList)
{
int numcars;
Car mycar = new Car();
Scanner input = new Scanner(System.in);


System.out.println("Enter a model: ");
String model = input.nextLine();

System.out.println("Enter a color: ");
String color = input.nextLine();

System.out.println("Enter a year: ");
int year = input.nextInt();

System.out.println("Enter a vin number: ");
int vin_number = input.nextInt();

System.out.println("Enter a price: ");
double price = input.nextDouble();

someList.add(new Car(model, color, year, vin_number, price));


System.out.println(someList);




}

public static void displayValue(LinkedList someList)
{
int value = someList.size();

System.out.println("There are " + value + " cars in the lot ");
System.out.println();

}


public static void main(String [] args)
{
Car mycar = new Car("Toyota", "White", 2012, 1234, 130.25);
Car mycar2 = new Car("Honda", "Black", 2013, 1235, 130.50);
Car mycar3 = new Car("Toyota", "White", 2012, 1234, 130.25);
Car mycar4 = new Car();


LinkedList myList = new LinkedList();
LinkedList<Car> myList2 = new LinkedList<Car>();
myList.add(mycar);
System.out.println(myList);

Car mycar5 = (Car) mycar2.clone(); 

System.out.println("Cloned Object: " + mycar5);

addCar(myList2);





}

}

[Tony Docherty]

I suggest you use a for-each loop to iterate over the linked list and then inside the loop test the input number against the vin number of the Car object.

BTW why are you not using generics throughout your code? and why are you calling your car list someList which is really doesn't tell you anything about what the list is likely to contain?