Battlefield game

[Bhavik Gandhi]

I have made this program for Battlefield game heres the code for client implementation

import edu.rit.util.Timer;
import edu.rit.util.TimerTask;
import edu.rit.util.TimerThread;

import java.awt.Toolkit;


import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import java.io.IOException;
import java.io.PrintStream;

import java.util.Scanner;

import java.util.regex.Pattern;

import javax.swing.WindowConstants;


public class ClientImpl
implements ClientRef
{

// Hidden data members.

private String myPlayer;
private int myplayerNo;
private double myangle,X,Y;
private ServerRef myServer;
private Timer myExitTimer =
TimerThread.getDefault().createTimer
(new TimerTask()
{
public void action
(Timer theTimer)
{
System.exit (0);
}
});


public ClientImpl
(String player,
ServerRef server)

{

myPlayer = player;
myServer = server;
myplayerNo = myServer.join (this, player);
if(myplayerNo == 1)
{
BattlefieldUI ui = new BattlefieldUI(true);
}
else
{
BattlefieldUI ui = new BattlefieldUI(false);
}

}




public synchronized void aim
(double angle)
{

myServer.Aimchanged(this,myplayerNo,angle);

}

public synchronized void fire(double x, double angle)
{

myServer.fire(this,myplayerNo);

}

public synchronized void quit()
{

myServer.quit(this,myplayerNo);
System.exit(0);

}


// Exported operations.



/*
* Set the position of the given player.
*
* @param playerNo player's number.
* @param player Player's name.
* @param X X-Co-ordinate.
*/
public synchronized void setPosition
(int playerNo,
String player,
double X)
{
if (playerNo ==1)
{
BattlefieldUI.setLeftName(player);
BattlefieldUI.setLeftCannonX(X);
BattlefieldUI.setLeftCannonAngle(0);
}
else
{
BattlefieldUI.setRightName(player);
BattlefieldUI.setRightCannonX(X);
BattlefieldUI.setRightCannonAngle(180);
}
}

public synchronized void changecannonangle
(int playerNo,
double angle)
{

if (playerNo ==1)
BattlefieldUI.setLeftCannonAngle(angle);
else
BattlefieldUI.setRightCannonAngle(angle);

}




public synchronized void setcannonball
(int playerNo,
double X,
double Y)
{
if (playerNo == 1)
BattlefieldUI.setLeftCannonball(X,Y,true);
else
BattlefieldUI.setRightCannonball(X,Y,true);
}


public synchronized void hit(int playerNo)
{
if (playerNo == 1)
{

BattlefieldUI.setLeftCannonX(-1);
BattlefieldUI.setLeftGravestone(true);
BattlefieldUI.setRightCannonball(0,0,false);

}
else
{

BattlefieldUI.setRightCannonX(-1);
BattlefieldUI.setRightGravestone(true);
BattlefieldUI.setLeftCannonball(0,0,false);

}

}

public synchronized void quit
(int playerNo)
{

myExitTimer.start (2000L);

}
public synchronized void userClosedWindow()
{

myServer.quit(this,myplayerNo);
myExitTimer.start (2000L);

}

/**
* Close this client. This method is called when the server will no longer
* communicate with this client.
*/
public synchronized void close()
{
myExitTimer.start (2000L);
}

public static void main(String[] args)
{

if (args.length != 1) usage();
String name = args[0];
ClientImpl clientimpl =
new ClientImpl
(name,
new ServerRef()
{
public int join
(ClientRef client,
String player){}
public void Aimchanged
(ClientRef client,
int playerNo,
double angle){}
public void fire
(ClientRef client,
int playerNo){}
public void quit
(ClientRef client,
int playerNo){}
public void close
(ClientRef client){}
});

}

private static void usage()
{
System.err.println ("Usage:ClientImpl <player> ");
System.err.println ("<player> = your name");
System.exit (1);
}
}

////////////////////////////////////////////////////////


But when I try to run it gives me following error

ClientImpl.java:121: non-static method setLeftName(java.lang.String) cannot be referenced from a static context
BattlefieldUI.setLeftName(player);
^
ClientImpl.java:122: non-static method setLeftCannonX(double) cannot be referenced from a static context
BattlefieldUI.setLeftCannonX(X);
^
ClientImpl.java:123: non-static method setLeftCannonAngle(double) cannot be referenced from a static context
BattlefieldUI.setLeftCannonAngle(0);
^
ClientImpl.java:127: non-static method setRightName(java.lang.String) cannot be referenced from a static context
BattlefieldUI.setRightName(player);
......................

I have not included list of all the error, but there are 16 errors in all which are similar for each battlefieldUI method call.

In BattlefieldUI all methods are non-static, but I cannot figure out why I am facing above errors though all methods in client implementation are non static.

Thanks in Advance

[Gavin Tranter]

Well, there is a lot of code there.
But the error itself sounds like you are trying to call an non-static method from a static method.

So you probably have a static method some place in you your code (probably main) that is trying to call none static methods from its own, or another class.

Gavin