gistfile1.java

/**
 * @(#)calculator.java
 *
 *
 * @author 
 * @version 1.00 2012/4/26
 */
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
public class calculator {
        
    /**
     * Creates a new instance of <code>calculator</code>.
     */
    public calculator() {
    }
    public static class formchinh extends Frame implements ActionListener, ItemListener
    {
    
    	Label lbm=new Label("");
    	JTextField tf=new JTextField();
    
    	Button btce = new Button("CE");
    	Button btc = new Button("C");
    
    	Button btam = new Button("+/-");
    	Button btcham = new Button(".");
    	Button btcong = new Button("+");
    	Button bttru = new Button("-");
    	Button btnhan = new Button("*");
    	Button btchia = new Button("/");
    	Button btcan = new Button("sqrt");
    	Button btphantram = new Button("%");
    	Button bt1tren = new Button("1/x");
    	Button btbang = new Button("=");
    	Button bt0 = new Button("0");
    	Button bt1 = new Button("1");
    	Button bt2 = new Button("2");
    	Button bt3 = new Button("3");
    	Button bt4 = new Button("4");
    	Button bt5 = new Button("5");
    	Button bt6 = new Button("6");
    	Button bt7 = new Button("7");
    	Button bt8 = new Button("8");
    	Button bt9 = new Button("9");
    	GridBagLayout gb=new GridBagLayout();
    	GridBagConstraints gbc=new GridBagConstraints();
    	Double a=0.0,b=0.0;
    	String pheptinh="";
    	public formchinh(String title)
    	{
    		super(title);
    		setLayout(gb);
	        this.addWindowListener
	        (
	            new WindowAdapter() {
	                public void windowClosing(WindowEvent e) {
	                    System.exit(1);
	                }
	            }
	        );
	       
	        
	        gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(tf,0,0,6,1); tf.setHorizontalAlignment(JTextField.RIGHT);
    		
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(lbm,0,1,1,1);
    	
    		btce.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btce,3,1,2,1);
    		btc.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btc,5,1,2,1);
    		
    	
    		bt7.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt7,1,2,1,1);
    		bt8.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt8,2,2,1,1);
    		bt9.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt9,3,2,1,1);
    		btchia.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btchia,4,2,1,1);
    		btcan.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btcan,5,2,1,1);
    		
    	
    		bt4.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt4,1,3,1,1);
    		bt5.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt5,2,3,1,1);
    		bt6.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt6,3,3,1,1);
    		btnhan.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btnhan,4,3,1,1);
    		btphantram.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btphantram,5,3,1,1);
    		
    	
    		bt1.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt1,1,4,1,1);
    		bt2.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt2,2,4,1,1);
    		bt3.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt3,3,4,1,1);
    		bttru.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bttru,4,4,1,1);
    		bt1tren.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt1tren,5,4,1,1);
    		
    	
    		bt0.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(bt0,1,5,1,1);
    		btam.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btam,2,5,1,1);
    		btcham.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btcham,3,5,1,1);
    		btcong.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btcong,4,5,1,1);
    		btbang.addActionListener(this);
    		gbc.fill=GridBagConstraints.HORIZONTAL;
    		addComponent(btbang,5,5,1,1);
    		
    		setSize(200,200);
    	}
    	public void addComponent(Component c, int col, int row, int ncol, int nrow)
    	{
    		gbc.gridx=col;
    		gbc.gridy=row;
    		gbc.gridwidth=ncol;
    		gbc.gridheight=nrow;
    		gb.setConstraints(c,gbc);
    		add(c);
    	}
    	public void actionPerformed(ActionEvent ae)
    	{
    	
    		if(ae.getSource()==bt0) tf.setText(tf.getText()+"0");
    		if(ae.getSource()==bt1) tf.setText(tf.getText()+"1");
    		if(ae.getSource()==bt2) tf.setText(tf.getText()+"2");
    		if(ae.getSource()==bt3) tf.setText(tf.getText()+"3");
    		if(ae.getSource()==bt4) tf.setText(tf.getText()+"4");
    		if(ae.getSource()==bt5) tf.setText(tf.getText()+"5");
    		if(ae.getSource()==bt6) tf.setText(tf.getText()+"6");
    		if(ae.getSource()==bt7) tf.setText(tf.getText()+"7");
    		if(ae.getSource()==bt8) tf.setText(tf.getText()+"8");
    		if(ae.getSource()==bt9) tf.setText(tf.getText()+"9");
    		if(ae.getSource()==btcham) if(!tf.getText().contains(".")) tf.setText(tf.getText()+".");
    		if(ae.getSource()==btcong) {pheptinh="+"; if(a==0.0)a=Double.parseDouble(tf.getText()); tf.setText("");}
    		if(ae.getSource()==bttru) {pheptinh="-"; if(a==0.0)a=Double.parseDouble(tf.getText()); tf.setText("");}
    		if(ae.getSource()==btnhan) {pheptinh="*"; if(a==0.0)a=Double.parseDouble(tf.getText()); tf.setText("");}
    		if(ae.getSource()==btchia) {pheptinh="/"; if(a==0.0)a=Double.parseDouble(tf.getText()); tf.setText("");}
    		if(ae.getSource()==btbang) {b=Double.parseDouble(tf.getText());
    			if(pheptinh=="+") {a=a+b; tf.setText(String.valueOf(a));};
    			if(pheptinh=="-") {a=a-b; tf.setText(String.valueOf(a));};
    			if(pheptinh=="*") {a=a*b; tf.setText(String.valueOf(a));};
    			if(pheptinh=="/") {a=a/b; tf.setText(String.valueOf(a));};
    			if(tf.getText().endsWith(".0")) tf.setText(tf.getText().substring(0,tf.getText().length()-2));
    		}
    		if(ae.getSource()==btc) {tf.setText("");}
    		if(ae.getSource()==btce) {pheptinh=""; tf.setText(""); a=0.0; b=0.0;}
    		if(ae.getSource()==btcan){tf.setText(String.valueOf(Math.sqrt(Double.parseDouble(tf.getText()))));}
    		if(ae.getSource()==bt1tren){tf.setText(String.valueOf(1/Double.parseDouble(tf.getText())));}
    		if(ae.getSource()==btphantram){tf.setText(String.valueOf(Double.parseDouble(tf.getText())/100));}
    	
    		if(ae.getSource()==btam) {
    			tf.setText(String.valueOf(Double.parseDouble(tf.getText())*-1));
    			if(tf.getText().endsWith(".0")) tf.setText(tf.getText().substring(0,tf.getText().length()-2));
    		
    			}
    	}
    	public void itemStateChanged(ItemEvent ie)
    	{
    	
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws Exception {
        // TODO code application logic here
        formchinh fc =new formchinh("CALCULATOR");
        fc.show();
    }
}
}