I wrote a fairly simple program using a GUI template to learn about adding some form of GUI in java. I completed the program only to discover that it cant be run outside of the IDE without a main method. The program works fine inside Eclipse IDE, but useless otherwise. How do I go about adding a main class so it can be executed as a .jar?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Game extends JApplet implements ActionListener {
// Create all labels, textfields and buttons needed (in order)
/**
* This is a tic tac toe game made with the purposes of learning java
*/
private static final long serialVersionUID = 1L;
JButton firstButton;
JButton secondButton;
JButton thirdButton;
JButton fourthButton;
JButton fithButton;
JButton sixthButton;
JButton seventhButton;
JButton eighthButton;
JButton ninthButton;
//this is the position value checker which are later set to x and o
String[] posCheck = { "", "", "", "", "", "", "", "", "" };
// score count JLABELs to display the score inside the game pane.
JLabel scoreP1;
JLabel scoreP2;
// this is used for formatting purposes or something like that, I guess.
JLabel blank;
// score count variables for both players, they both start at 0.
int scoreCount1 = 0, scoreCount2 = 0;
int gamesPlayed = -1;
boolean gameDone = false;
int k;
String prevWinner = "";
// Create any global variables/arrays needed later in the program (final)
Container pane = getContentPane();
//this sets the tile to X or O depending on who's turn it is
String[] symbol = { "O", "X" };
int turnCounter = 0;
int tieChecker = 0;
// Sets up GUI components.
public void init() {
pane.setLayout(new GridLayout(4, 3));
setSize(500, 500);
// Adds jlabel for scores
scoreP1 = new JLabel();
scoreP1.setText("Player (X) score: " + String.valueOf(scoreCount1));
scoreP2 = new JLabel();
scoreP2.setText("Player (O) score: " + String.valueOf(scoreCount2));
blank = new JLabel();
blank.setText(prevWinner);
// these are the JButtons that go in the game panel along with action
// listeners
firstButton = new JButton();
firstButton.addActionListener(this);
secondButton = new JButton();
secondButton.addActionListener(this);
thirdButton = new JButton();
thirdButton.addActionListener(this);
fourthButton = new JButton();
fourthButton.addActionListener(this);
fithButton = new JButton();
fithButton.addActionListener(this);
sixthButton = new JButton();
sixthButton.addActionListener(this);
seventhButton = new JButton();
seventhButton.addActionListener(this);
eighthButton = new JButton();
eighthButton.addActionListener(this);
ninthButton = new JButton();
ninthButton.addActionListener(this);
pane.add(firstButton, 0); // second parameter is the index on pane
pane.add(secondButton, 1);
pane.add(thirdButton, 2);
pane.add(fourthButton, 3);
pane.add(fithButton, 4);
pane.add(sixthButton, 5);
pane.add(seventhButton, 6);
pane.add(eighthButton, 7);
pane.add(ninthButton, 8);
pane.add(scoreP1);
pane.add(blank);
pane.add(scoreP2);
gamesPlayed++;
setContentPane(pane);
} // init method
// checks for mouse clicks here.
public void actionPerformed(ActionEvent e) {
if (e.getSource() instanceof JButton) {
if (e.getSource() == firstButton)
revealButton(firstButton, 0);
else if (e.getSource() == secondButton)
revealButton(secondButton, 1);
else if (e.getSource() == thirdButton)
revealButton(thirdButton, 2);
else if (e.getSource() == fourthButton)
revealButton(fourthButton, 3);
else if (e.getSource() == fithButton)
revealButton(fithButton, 4);
else if (e.getSource() == sixthButton)
revealButton(sixthButton, 5);
else if (e.getSource() == seventhButton)
revealButton(seventhButton, 6);
else if (e.getSource() == eighthButton)
revealButton(eighthButton, 7);
else if (e.getSource() == ninthButton)
revealButton(ninthButton, 8);
}
} // actionPerformed method
// respond to button pushed
public void revealButton(JButton button, int index) {
// removes the indicated button from pane
pane.remove(button);
// creates a new text field to take the place of the button, makes it
// uneditable and sets background colour
JTextField textField = new JTextField();
textField.setEditable(false);
textField.setBackground(Color.WHITE);
// sets the alignment for the text in the field
textField.setHorizontalAlignment(SwingConstants.CENTER);
// adds the new textfield to the pane at the location of the old button
pane.add(textField, index);
posCheck[index] = symbol[(turnCounter % 2)];
prevWinner = "Player (" + symbol[(turnCounter % 2)]
+ ") is the winner!";
// re-creates pane with new information
setContentPane(pane);
// this sets the text field to either X or O depending who placed last.
textField.setText(symbol[(turnCounter) % 2]);
button.setEnabled(false);
// this is a counter to check if it is a cats game.
tieChecker++;
// check for winner X here
if (((posCheck[0] == "X") && (posCheck[1] == "X") && (posCheck[2] == "X"))
|| ((posCheck[3] == "X") && (posCheck[4] == "X") && (posCheck[5] == "X"))
|| ((posCheck[6] == "X") && (posCheck[7] == "X") && (posCheck[8] == "X"))
|| ((posCheck[0] == "X") && (posCheck[3] == "X") && (posCheck[6] == "X"))
|| ((posCheck[1] == "X") && (posCheck[4] == "X") && (posCheck[7] == "X"))
|| ((posCheck[2] == "X") && (posCheck[5] == "X") && (posCheck[8] == "X"))
|| ((posCheck[0] == "X") && (posCheck[4] == "X") && (posCheck[8] == "X"))
|| ((posCheck[2] == "X") && (posCheck[4] == "X") && (posCheck[6] == "X"))) {
// this part updates the winner score then refreshes the text field
// to reflect the change
scoreCount1++;
scoreP1.setText("Player (X) score: " + String.valueOf(scoreCount1));
blank.setText("Player (X) Is the winner.");
gameDone = true;
turnCounter++;
}
// this checks if O has won the game.
else if (((posCheck[0] == "O") && (posCheck[1] == "O") && (posCheck[2] == "O"))
|| ((posCheck[3] == "O") && (posCheck[4] == "O") && (posCheck[5] == "O"))
|| ((posCheck[6] == "O") && (posCheck[7] == "O") && (posCheck[8] == "O"))
|| ((posCheck[0] == "O") && (posCheck[3] == "O") && (posCheck[6] == "O"))
|| ((posCheck[1] == "O") && (posCheck[4] == "O") && (posCheck[7] == "O"))
|| ((posCheck[2] == "O") && (posCheck[5] == "O") && (posCheck[8] == "O"))
|| ((posCheck[0] == "O") && (posCheck[4] == "O") && (posCheck[8] == "O"))
|| ((posCheck[2] == "O") && (posCheck[4] == "O") && (posCheck[6] == "O"))) {
// this part updates the winner score then refreshes the text field
// to reflect the change
scoreCount2++;
scoreP2.setText("Player (O) score: " + String.valueOf(scoreCount2));
blank.setText("Player (O) Is the winner.");
gameDone = true;
turnCounter++;
}
// this checks if there has been a tie in the game
else if (tieChecker >= 9) {
prevWinner = ("It's a cat's game!");
tieChecker = 0;
gameDone = true;
turnCounter++;
}
// this makes sure the game doesnt end prematurely
else {
gameDone = false;
}
// this if statement is engaged when the game is done and resets the
// board
if (gameDone == true) {
pane.removeAll();
textField.removeAll();
tieChecker = 0;
init();
posCheck[0] = "";
posCheck[1] = "";
posCheck[2] = "";
posCheck[3] = "";
posCheck[4] = "";
posCheck[5] = "";
posCheck[6] = "";
posCheck[7] = "";
posCheck[8] = "";
posCheck[9] = "";
}// end of reset sequence
turnCounter++;
blank.setText("Games Played: " + gamesPlayed);
}
}
If you insist on keeping it as an Applet, make another class and do this:
import javax.swing.JFrame;
public class Main {
public static void main(String[] args) {
JFrame frame = new JFrame();
Game g = new Game();
g.init();
frame.getContentPane().add(g);
frame.pack();
frame.setVisible(true);
}
}