Method cannot be applied error

Question

I am having trouble compiling my application because it says a sorting method I want to use cannot be applied to the array I want to sort.
I have a class that was supplied by my instructor that contains a constuctor for an object called "automobile". This constructor has 4 args which are (string, string, double, double). The strings are for make and model of vehicle and the doubles are for gas tank size and range on a full tank. The constructor takes the double values and calculates the miles per gallon. In my application I am making an array of 15 vehicles called "automobile". When I print to an outpuBox the list of vehicles, everthing looks fine. The problem is I need to sort the array by the miles per gallon. Now I have made a seperate class the contains my "cocktail shaker sort", but when it seems that the array of vehicles I created cannot be used in the args of the sort method. Any help would be greatly appeciated. This thing was due a week ago and I've been pulling my hair for 3weeks.
The error message is:
Autos.java:64: cockTailSort(int[]) in CockTail cannot be applied to (Automobile[])
CockTail.cockTailSort(automobile);
1 error
Below is my application and following that will be the cocktailshaker class.
import javabook.*;
import java.text.DecimalFormat;
class Autos
public static void main (String[] args){
MainWindow mainWindow;
InputBox inputBox;
OutputBox outputBox;
MessageBox messageBox;
ResponseBox responseBox;
String modelName, modelType;
double gasTankCapacity, rangeOnFullTank;
int count;
mainWindow = new MainWindow ("Automobile input");
inputBox = new InputBox (mainWindow);
outputBox = new OutputBox (mainWindow);
responseBox = new ResponseBox (mainWindow );
messageBox = new MessageBox (mainWindow);
messageBox.setVisible (false );
mainWindow.setVisible ( true ) ;
outputBox.setVisible ( true ) ;
Automobile[] automobile = new Automobile [3];
int i=0;
count =1;
for (i = 0 ; i < automobile.length ; i ++){
modelName = inputBox.getString ("Enter Model Name for vehicle #" + count);
modelType = inputBox.getString ("Model Type for #" + count);
gasTankCapacity = inputBox.getDouble("Gas capacity for #" + count);
rangeOnFullTank = inputBox.getDouble("Fulltank range for #" + count);
automobile[ i ] = new Automobile ( modelName, modelType,gasTankCapacity,rangeOnFullTank );
count ++;
CockTail.cockTailSort(automobile);
for (i = 0 ; i < automobile.length ; i ++){
automobile.displayAutomobile(outputBox);
Here is the sort:
import javabook.*;
class CockTail
public CockTail()
public static void cockTailSort (int a [] )
boolean sorted = false;
int top = a.length -1, bottom =0;
for (int pass =1; bottom < top && !sorted; pass ++)
sorted = true;
if (pass % 2 != 0) // odd # passes
for (int i = bottom; i < top; i ++)
if (a[i] > a[i + 1])
sorted = false;
int temp = a[i];
a[i] = a[i + 1];
a[i + 1] = temp;
top --;
else // even-numbered passes
for (int i = top; i > bottom; i--)
if (a[i - 1] > a[i])
sorted =false;
int temp = a[i];
a[i] = a[i - 1];
a[i - 1] = temp;
bottom ++;

Answer 1

Well I changed it to what you said and it didn't work. I really appreciate your though.
Here are the source codes :
import javabook.*;
import java.util.*;
import java.text.DecimalFormat;
class Autos
* Setting data members and constructors
public static void main (String[] args){
MainWindow mainWindow;
InputBox inputBox;
OutputBox outputBox;
MessageBox messageBox;
ResponseBox responseBox;
String modelName, modelType;
double gasTankCapacity, rangeOnFullTank;
int count;
mainWindow = new MainWindow ("Automobile input");
inputBox = new InputBox (mainWindow);
outputBox = new OutputBox (mainWindow);
responseBox = new ResponseBox (mainWindow );
messageBox = new MessageBox (mainWindow);
messageBox.setVisible (false );
mainWindow.setVisible ( true ) ;
outputBox.setVisible ( true ) ;
outputBox.printLine("This program will ask for data for 15 vehicles and ");
outputBox.printLine("calculate the Miles Per Galllon for each vehicle and ");
outputBox.printLine("compare the MPGs to be displayed in a sorted list in an outpuBox.");
outputBox.printLine("you will be asked to enter the vehicles model, model type");
outputBox.printLine("gas tank capacity and total range on a full tank.");
// create an automobile array
Automobile[] automobile = new Automobile [3];
* Loop for data inputs an array creation
int i=0;
count =1;
for (i = 0 ; i < automobile.length ; i ++){
modelName = inputBox.getString ("Enter Model Name for vehicle #" + count);
modelType = inputBox.getString ("Model Type for #" + count);
gasTankCapacity = inputBox.getDouble("Gas capacity for #" + count);
rangeOnFullTank = inputBox.getDouble("Fulltank range for #" + count);
automobile[ i ] = new Automobile ( modelName, modelType,gasTankCapacity,rangeOnFullTank );
count ++;
*Code for cocktail sort method call
CockTail.cockTailSort(automobile); // Error in code
* Display data and MPG's in outputBox
for (i = 0 ; i < automobile.length ; i ++){
automobile.displayAutomobile(outputBox);
Here is the cocktail shaker sort:
import javabook.*;
import java.util.*;
class CockTail
//public CockTail()
public static void cockTailSort (Automobile[] a )
boolean sorted = false;
int top = a.length -1, bottom =0;
for (int pass =1; bottom < top && !sorted; pass ++)
sorted = true;
if (pass % 2 != 0) // odd # passes
for (int i = bottom; i < top; i ++)
if (a[i] .compareto( a[i + 1])==1)
sorted = false;
Automobile temp = a[i];
a[i] = a[i + 1];
a[i + 1] = temp;
top --;
else // even-numbered passes
for (int i = top; i > bottom; i--)
if (a[i] .compareto( a[i - 1])==1)
sorted =false;
Automobile temp = a[i];
a[i] = a[i - 1];
a[i - 1] = temp;
bottom ++;
Here is what I know of the Automobile class:
// JBuilder API Decompiler stub source generated from class file
// Aug 6, 2002
// -- implementation of methods is not available
// Imports
import java.lang.String;
import javabook.OutputBox;
class Automobile {
// Fields
private String modelName;
private String modelType;
private double gasTankCapacity;
private double rangeOnFullTank;
private double milesPerGallon;
// Constructors
public Automobile() { }
public Automobile(String p0, String p1, double p2, double p3) { }
// Methods
public int compareto(Automobile p0) { }
public void displayAutomobile(OutputBox p0) { }