calculategui.java

简单的计算器程序

package calculate;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.ComponentOrientation;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class CalculateGUI implements ActionListener {
	
	private Calculate calculate;
	
	private Frame frame;
	
	private TextField showTextTxd;
	
	public CalculateGUI() {
		this.calculate = new Calculate();
		
		this.frame = new Frame("计算器");
		this.showTextTxd = new TextField("0.");
		Panel centerPanel = createCenterPanel();
		
		this.frame.add(this.showTextTxd, BorderLayout.NORTH);
		this.frame.add(centerPanel, BorderLayout.CENTER);
		this.frame.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				super.windowClosing(e);
				System.exit(0);
			}
		});
		
		this.frame.pack();
		this.frame.setVisible(true);
	}

	private Panel createCenterPanel() {
		Panel centerPanel = new Panel(new BorderLayout());
		centerPanel.add(createNorthCenterPanel(), BorderLayout.NORTH);
		centerPanel.add(createWestCenterPanel(), BorderLayout.WEST);
		centerPanel.add(createCenterCenterPanel(), BorderLayout.CENTER);
		return centerPanel;
	}

	private Panel createCenterCenterPanel() {
		Panel centerCenterPanel = new Panel(new GridLayout(4, 5));
		Button[][] centerBtns = new Button[4][5];
		centerBtns[0] = new Button[] {
				new Button("7"),
				new Button("8"),
				new Button("9"),
				new Button("/"),
				new Button("sqrt")
		};
		centerBtns[1] = new Button[] {
				new Button("4"),
				new Button("5"),
				new Button("6"),
				new Button("*"),
				new Button("%")
		};
		centerBtns[2] = new Button[] {
				new Button("1"),
				new Button("2"),
				new Button("3"),
				new Button("-"),
				new Button("1/x")
		};
		centerBtns[3] = new Button[] {
				new Button("0"),
				new Button("+/-"),
				new Button("."),
				new Button("+"),
				new Button("=")
		};
		
		for (int i = 0; i < centerBtns.length; ++i) {
			for (int j = 0; j <centerBtns[i].length; ++j) {
				centerBtns[i][j].addActionListener(this);
				centerCenterPanel.add(centerBtns[i][j]);
			}
		}
		
		return centerCenterPanel;
	}

	private Panel createWestCenterPanel() {
		Panel westCenterPanel = new Panel(new GridLayout(4, 1));
		Button mcBtn = new Button("MC");
		Button mrBtn = new Button("MR");
		Button msBtn = new Button("MS");
		Button mAddtn = new Button("M+");
		mcBtn.addActionListener(this);
		mrBtn.addActionListener(this);
		msBtn.addActionListener(this);
		mAddtn.addActionListener(this);
		westCenterPanel.add(mcBtn);
		westCenterPanel.add(mrBtn);
		westCenterPanel.add(msBtn);
		westCenterPanel.add(mAddtn);
		
		return westCenterPanel;
	}

	private Panel createNorthCenterPanel() {
		Panel northCenterPanel = new Panel(new GridLayout(1, 4));
		Button blankBtn = new Button();
		Button backspaceBtn = new Button("Backspace");
		Button ceBtn = new Button("CE");
		Button cBtn = new Button("C");
		backspaceBtn.addActionListener(this);
		ceBtn.addActionListener(this);
		cBtn.addActionListener(this);
		northCenterPanel.add(blankBtn);
		northCenterPanel.add(backspaceBtn);
		northCenterPanel.add(ceBtn);
		northCenterPanel.add(cBtn);
		
		return northCenterPanel;
	}

	public void actionPerformed(ActionEvent e) {
		this.showTextTxd.setText(this.calculate.run(e.getActionCommand()));
	}
	
	public static void main(String[] args) {
		new CalculateGUI();
	}
}