Sorting Array UI

[Brandon Seale]

My project is to input weather stations and their temperatures using a user interface(command Post Temperatures) and then once thats posted enter another command (Display HighLow) which displays the station with the highest temp and the lowest temp.

WeatherStationData.java- creates temp and id
WeatherStationUI.java- hosts menu with commands
WeatherStationMain.java runs ui
WeatherStationList.java stores data in a list.

Here's my post command on WeatherStationUI.java

WeatherStationList Collection = new WeatherStationList(); // to store data
public void PostTemperatures() //posts temps
{
String ID, Unit;
double Temp;

while(true){


System.out.print("Station Name: "); //prompts for station name
ID = Input.nextLine(); // puts next line as id

if(ID.equals("Stop")) //breaks
break;

System.out.print("Station Temp: ");
Unit = Input.nextLine();
Temp = Double.parseDouble(Unit); //turns into double
Collection.Add(ID, Temp);
}

}

here on WeatherStationList.java i take the data inputted from the post command -- WeatherStationUI.java and store it in an array List[i].

I want to sort the array list by temperature. so that list[0]= "smallest value" and list[1]="largest value"

public WeatherStationData[] List = new WeatherStationData[MaxSize];

public void Add(String ID, double Temp)
{
if(CurrSize < MaxSize) { //Make sure there's room...
List[CurrSize] = new WeatherStationData(ID, Temp); //Then add it...
CurrSize++; //Bump the count up, because there's one more...
}
else
System.out.println("Sorry List Is Full"); //Whoops! no more room...
}

[Junky]

I want to sort the array list by temperature. so that list[0]= "smallest value" and list[1]="largest value"

That is not practical. When you sort things the smallest is the first and the largest is the last (or vice versa).

There are 3 ways to achieve your goal.

Write your own sort method following a well publicised sorting algorithm

Use Arrays.sort. Make your class (the objects in the array) extend comparable. Or create a Comparator and pass that to the sort method.

Don't sort at all. Just keep track of the largest and smallest as the values are read in.

[Brandon Seale]

where would you put the sort?

/*
 * title: Main.java
 * name: Brandon Seale
 * date: 2/16
 * comments: used Happy Inventory as framework for project.
 */
public class Main {
    
    public static void main(String[] args)
    {
   	 WeatherStationUI NewList = new WeatherStationUI();
    }

}

/*
 * Title:   		 WeatherStationUI.java
 * Description:   	 Supplies a frame for using the WeatherStationList class...
 */

import java.util.*;

public class WeatherStationUI {
    
    WeatherStationList Collection = new WeatherStationList(); // to store data
    
    Scanner Input = new Scanner(System.in); // new scanner
    
    public WeatherStationUI() { RunIT(); }
    
    public void RunIT()
    {
   	String Command;
       
   	while(true) {
   		Menu(); // menu
   	    
   		System.out.print("Command: "); //uses next line as command
   		Command = Input.nextLine();

   	 if(Command.equals("Quit")) // "Quit" breaks from program
   			break;
   		else if(Command.equals("Post Temperatures")) // to post temps
   			PostTemperatures();
   		else if(Command.equals("High-Low Report")) // to view high low
   			break;
   		else if(Command.equals("Daily Report")) // view all
   			Collection.Display();
   	    
   	}
    
       
    }

    public void Menu() //choices
    {
   	 System.out.println("Choices.......................................");
   	 System.out.println("\tPost Temperatures...allows the user to post new stations");
   	 System.out.println("\tHigh-Low Report...allow the user to view high to low.");
   	 System.out.println("\tDaily Report.....displays the entire list.");
   	 System.out.println("\tQuit");
   	 System.out.println("----------------------------------------------");
    }
    
    public void PostTemperatures() //posts temps
    {
   	 String ID, Unit;
   	 double Temp;
   	 
   	 while(true){
   			 
   			 
   			 System.out.print("Station Name: "); //prompts for station name
   			 ID = Input.nextLine(); // puts next line as id
   			 
   			 if(ID.equals("Stop")) //breaks
   				 break;
   			 
   			 System.out.print("Station Temp: ");
   			 Unit = Input.nextLine();
   			 Temp = Double.parseDouble(Unit); //turns into double
   			 Collection.Add(ID, Temp); // sends to collection
           	 
       	 
   		 
   		 
   		 
   		 
   		 
   	 }
   	 
    }
    
    
    
}

/*
 * Title:   		 WeatherStationData.java
 * Description:   	 This represent a single Weather Station
 *
 */

public class WeatherStationData {
    private String StationID;  //Each Station must have a unique identifier...
    private double StationTemp;
    
    
    public WeatherStationData() //Define a default constructor...
    {
   	 StationID = "";   	 
   	 StationTemp = 0.0;
   	 
    }
    
    public WeatherStationData(String ID, double Temp) //...intializer
    {
   	 StationID = ID;
   	 StationTemp = Temp;
   	 
   	 
   	 
    }
    
    //Define some setter methods...
    
    public void SetID(String ID)  { StationID = ID; }
    public void SetTemp(double Temp) { StationTemp = Temp; }
    
    
    //Define some getter methods...
    
    public String GetID()  { return StationID; }
    public double GetTemp()  { return StationTemp; }
    
    
}

/*
 * Title:   	 WeatherStationList.java
 * Description: this implements and manages a list of inventory items...
 */
import java.text.DecimalFormat;//in order to display in decimal format
import java.text.NumberFormat;//same

public class WeatherStationList {
    
    private int MaxSize = 25;  //The value here is the List's absolute size...
    private int CurrSize = 0;  //The number of item currently list...
    
    private WeatherStationData[] List = new WeatherStationData[MaxSize];
    
    
    //Define the core methods for the list...
    
    //First a way to add items to the list...
    
    public void Add(String ID, double Temp)
    {
   	 if(CurrSize < MaxSize) {  //Make sure there's room...
   		 List[CurrSize] = new WeatherStationData(ID, Temp); //Then add it...
   		 CurrSize++; //Bump the count up, because there's one more...
   	 }
   	 else
   		 System.out.println("Sorry List Is Full"); //Whoops! no more room...
    }
public void HL2(String ID, double Temp)
{
}
    public void Display()
    {
   	 int K;
   	 
   	 for(K = 0 ; K < CurrSize ; K++)  {
   		 if(List[K] != null) {
   			 NumberFormat Rounder = new DecimalFormat("#0.00"); //displays in 0.00 decimal format
   			 
   			 System.out.println("Weather Station:   " + List[K].GetID()); //gets station id
   			 System.out.println("Temperature: " + List[K].GetTemp() + "	" + Rounder.format(((5*(List[K].GetTemp()-32))/9)));//shows temp in F and Celcius
   			 
   		 }
   	 }
   	 
    }
    
    
    
    
    
    

}

[Brandon Seale]

i would like to use array.sort then, but not sure how to go about doing that

[Junky]

You have already done Post Temperatures. How about working on HighLow Report. Then you would sort the array just before you display to high and low values.

[Brandon Seale]

/*
 * Title:			WeatherStationUI.java
 * Description:		Supplies a frame for using the WeatherStationList class...
 */


import java.util.*;


public class WeatherStationUI {
	
	WeatherStationList Collection = new WeatherStationList(); // to store data
	Scanner Input = new Scanner(System.in); // new scanner
	
	
	
	
	public WeatherStationUI() { RunIT(); } 
	
	public void RunIT()
	{
		
	   String Command;
	   
	   while(true) {
		   Menu(); // menu
		   
		   System.out.print("Command: "); //uses next line as command
		   Command = Input.nextLine();

		if(Command.equals("Quit")) // "Quit" breaks from program
			   break;
		   else if(Command.equals("Post Temperatures"))	 
			   PostTemperatures();	
[B]	   
		   else if(Command.equals("High-Low Report")) // to view high low			   
			   	Collection.Display2();[/B]
		   else if(Command.equals("Daily Report")) // view all
			   Collection.Display();
		   
	   }
	
	   
	}

	
	
	public void Menu() //choices
	{
		System.out.println("Choices.......................................");
		System.out.println("\tPost Temperatures...allows the user to post new stations");
		System.out.println("\tHigh-Low Report...allow the user to view high to low.");
		System.out.println("\tDaily Report.....displays the entire list.");
		System.out.println("\tQuit");
		System.out.println("----------------------------------------------");
	}
	
	public void PostTemperatures() //posts temps
	{
		String ID, Unit;
		double Temp;
		
		while(true){
				
				
				System.out.print("Station Name: "); //prompts for station name
				ID = Input.nextLine(); // puts next line as id
				
				if(ID.equals("Stop")) //breaks
					break;
				
				System.out.print("Station Temp: ");
				Unit = Input.nextLine(); 
				Temp = Double.parseDouble(Unit); //turns into double
				Collection.Add(ID, Temp); 
	            
            
			
			
			
			
			
		}
		
		
	}
	
	
	
	
	
	
	
}

/*
 * Title:		WeatherStationList.java
 * Description: this implements and manages a list of inventory items...
 */
import java.text.DecimalFormat;//in order to display in decimal format
import java.text.NumberFormat;//same
import java.util.*;


public class WeatherStationList {
	
	private int MaxSize = 25;  //The value here is the List's absolute size...
	private int CurrSize = 0;  //The number of item currently list...
	
	public WeatherStationData[] List = new WeatherStationData[MaxSize];
	
	
	
	//Define the core methods for the list...
	
	//First a way to add items to the list...
	
	public void Add(String ID, double Temp)
	{
		if(CurrSize < MaxSize) {  //Make sure there's room...
			List[CurrSize] = new WeatherStationData(ID, Temp); //Then add it...
			CurrSize++; //Bump the count up, because there's one more...
		}
		else
			System.out.println("Sorry List Is Full"); //Whoops! no more room...
	}
	
	
	
	
	
	public void Display()
	{
		int K;
		
		for(K = 0 ; K < CurrSize ; K++)  {
			if(List[K] != null) {
				NumberFormat Rounder = new DecimalFormat("#0.00"); //displays in 0.00 decimal format
				
				System.out.println("Weather Station:   " + List[K].GetID()); //gets station id
				System.out.println("Temperature: " + List[K].GetTemp() + "    " + Rounder.format(((5*(List[K].GetTemp()-32))/9)));//shows temp in F and Celcius
				
			}
		}
		
	
		
	}
	
	
	[B]public void Display2()
	{

                        What Code Do i enter here to sort the list by the value of the Double Temp?
			 


			System.out.println("Highest Temperature: " + List[0].GetID() + List[0].GetTemp());
			System.out.println("Lowest Temperature: " + List[CurrSize].GetID() + List[CurrSize].GetTemp());
		
	}[/B]
		
	
	
	
	
	
	

}

[Junky]

What Code Do i enter here to sort the list by the value of the Double Temp?

I gave you three options to do this. Choose one and implement the code. If you want more specific help then ask a more specific question. At the moment your question is akin to "I want to build a space shuttle. How do I do that?"

On the other hand if you are just waiting for someone to post code then I won't do that.