restaurant.java

JAVA编写的小餐厅用户界面式的点餐算价器,还带有外框Boder

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class Restaurant extends JFrame implements ActionListener {
	JMenuBar	menuBar;
	JMenu		options, calcu;
	JMenuItem	rest, quit, starters, mains, desserts;
	JPanel		Starters = new JPanel(new GridLayout(4,2,2,2));
	JPanel		Mains = new JPanel(new GridLayout(4,2,2,2));
	JPanel		Desserts = new JPanel(new GridLayout(4,2,2,2));
	JPanel		total = new JPanel(new GridLayout(3,1,2,2));
	JPanel		cost = new JPanel(new FlowLayout(FlowLayout.LEFT));
	JLabel		A[],B[],C[],D;
	JComboBox	a[],b[],c[];
	JTextField	text4;
	Border		blackline = BorderFactory.createLineBorder(Color.black);
	double		aprice[],bprice[],cprice[];
	static double	cost1=0, cost2=0, cost3=0, cost4=0;

	public Restaurant() {

		menuBar = new JMenuBar();
		setJMenuBar(menuBar);
		options = new JMenu("options");
		menuBar.add(options);
		rest = new JMenuItem("Rest");
		rest.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, InputEvent.CTRL_MASK));
		rest.addActionListener(this);
		options.add(rest);
		options.addSeparator();
		quit = new JMenuItem("Quit");
		quit.addActionListener(this);
		quit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, InputEvent.CTRL_MASK));
		options.add(quit);

		calcu = new JMenu("calculation cost");
		menuBar.add(calcu);
		starters = new JMenuItem("Starters");
		starters.addActionListener(this);
		starters.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
		calcu.add(starters);
		mains = new JMenuItem("Mains");
		mains.addActionListener(this);
		mains.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_M, InputEvent.CTRL_MASK));
		calcu.add(mains);
		desserts = new JMenuItem("Desserts");
		desserts.addActionListener(this);
		desserts.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, InputEvent.CTRL_MASK));
		calcu.add(desserts);

		String[] num = {"0","1","2","3","4","5","6"};
		Border title1 = BorderFactory.createTitledBorder(blackline, "Starters");

		A = new JLabel[5];
		A[0] = new JLabel("Chickens Lettuce Wraps - 7.95");
		A[1] = new JLabel("Bruschetta - 6.95");
		A[2] = new JLabel("Chilli Cheese Fries - 6.25");
		A[3] = new JLabel("Total Starter Cost:");
		A[4] = new JLabel("£0.00");
		a = new JComboBox[3];
		for (int l=0; l<3; l++) {
			a[l] = new JComboBox (num);
			a[l].addActionListener(this);
		}
		addToJPanel(Starters, A, a);
		Starters.setBorder(title1);

		Border title2 = BorderFactory.createTitledBorder(blackline, "Mains");
		B = new JLabel[5];
		B[0] = new JLabel("Gardenburger(v) - 7.45");
		B[1] = new JLabel("Angel Hair Pasta - 9.45");
		B[2] = new JLabel("Pot Roast Dinner - 12.95");
		B[3] = new JLabel("Total Main Course Cost:");
		B[4] = new JLabel("£0.00");
		b = new JComboBox [3];
		for (int k=0; k<3; k++) {
			b[k] = new JComboBox (num);
			b[k].addActionListener(this);
		}
		addToJPanel(Mains, B, b);
		Mains.setBorder(title2);

		Border title3 = BorderFactory.createTitledBorder(blackline, "Desserts");
		C = new JLabel[5];
		C[0] = new JLabel("BJ's Famous Pizookie - 4.75");
		C[1] = new JLabel("Cookies and Cream, Party Platter - 14.95");
		C[2] = new JLabel("BJ's Brownie - 3.75");
		C[3] = new JLabel("Total Dessert Cost:");
		C[4] = new JLabel("£0.00");
		c = new JComboBox[3];
		for (int m=0; m<3; m++) {
			c[m] = new JComboBox(num);
			c[m].addActionListener(this);
		}
		addToJPanel(Desserts, C, c);
		Desserts.setBorder(title3);

		total.add(Starters);
		total.add(Mains);
		total.add(Desserts);

		D = new JLabel("Total Cost:");
		cost.add(D);
		text4 = new JTextField("£0.00");
		text4.setEditable(false);
		cost.add(text4);

		setTitle("BJ's Brewhouse");
		setSize(450,500);
		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		getContentPane().setLayout(new BorderLayout());
		this.getContentPane().add(total, BorderLayout.CENTER);
		this.getContentPane().add(cost, BorderLayout.SOUTH);
		setVisible(true);
	}

	static void addToJPanel (JPanel panel, JLabel[] label, JComboBox[] box) {
		for(int i=0; i<8; i++) {
			if (i%2==0) {
				panel.add(label[i/2]);
			} else if(i==7) {
				panel.add(label[(i+1)/2]);
			} else {
				box[(i-1)/2].setSelectedIndex(0);
				panel.add(box[(i-1)/2]);
			}
		}
	}

	static void calculate (JComboBox[] box, double price[], double cost, JLabel[] label, JTextField text4) {
		int times =0;
		for (int i=0; i<3; i++) {
			times+=box[i].getSelectedIndex();
			cost=cost+(box[i].getSelectedIndex())*price[i];
		}
		if(times>6) {
			for(int n=0;n<3;n++) {
				box[n].setSelectedIndex(0);
			}
			label[4].setText("£0.00");
			text4.setText("£0.00");
		} else {
			cost4+=cost;
			label[4].setText("£"+cost);
			text4.setText("£"+cost4);
		}
	}

	public void actionPerformed(java.awt.event.ActionEvent e) {
		if(e.getActionCommand()=="Rest") {
			for(int n=0;n<3;n++) {
				a[n].setSelectedIndex(0);
				b[n].setSelectedIndex(0);
				c[n].setSelectedIndex(0);
			}
			cost4=0;
			A[4].setText("£0.00");
			B[4].setText("£0.00");
			C[4].setText("£0.00");
			text4.setText("£0.00");
		} else if(e.getActionCommand()=="Quit") {
			System.exit(0);
		} else if(e.getActionCommand()=="Starters") {
			double[] aprice ={7.95,6.95,6.25};
			calculate(a, aprice, cost1, A, text4);
		} else if(e.getActionCommand()=="Mains") {
			double[] bprice = {7.45,9.45,12.95};
			calculate(b, bprice, cost2, B, text4);
		} else if(e.getActionCommand()=="Desserts"){
			double[] cprice = {4.75,14.95,3.75};
			calculate(c,cprice, cost3, C, text4);
		}
	}


	public static void main(String args[]) {

		JFrame meal = new Restaurant();

	}

}