package 計算器程序;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class myWindows extends JFrame implements ActionListener
{
boolean tag=true; //判斷輸入的數據是否為整數，初始為整數。
boolean signal=true;//符號，即正數或負數，初始為正數。
JTextField text1;
public myWindows(int w,int h)
{
setTitle("計算器程序");
this.setBounds(100,100,350,300);
Container con = getContentPane();
con.setLayout(new GridLayout(3,1));
JPanel p1 = new JPanel();
p1.setLayout(new GridLayout(2,1));
text1 = new JTextField(150);
text1.setHorizontalAlignment(text1.RIGHT);
text1.setText("0.");
JPanel p1_1 = new JPanel();
p1_1.setLayout(new GridLayout(1,4));
JButton btn_BackSpace = new JButton("BackSpace");
btn_BackSpace.setForeground(Color.red);
btn_BackSpace.addActionListener(this);
JButton btn_CE = new JButton("CE");
btn_CE.setForeground(Color.red);
JButton btn_C = new JButton("C");
btn_C.setForeground(Color.red);
btn_C.addActionListener(this);
p1.add(text1);
p1_1.add(new JLabel());
p1_1.add(btn_BackSpace);
p1_1.add(btn_CE);
p1_1.add(btn_C);
p1.add(p1_1);
JPanel p2 = new JPanel();
p2.setLayout(new GridLayout(2,1));
JPanel p2_1 = new JPanel();
p2_1.setLayout(new GridLayout(1,6));
JButton btn_MC = new JButton("MC");
btn_MC.setForeground(Color.red);
JButton btn_7 = new JButton("7");
btn_7.setForeground(Color.BLUE);
btn_7.addActionListener(this);
JButton btn_8 = new JButton("8");
btn_8.setForeground(Color.BLUE);
btn_8.addActionListener(this);
JButton btn_9 = new JButton("9");
btn_9.setForeground(Color.BLUE);
btn_9.addActionListener(this);
JButton btn_wind= new JButton("/");
btn_wind.setForeground(Color.red);
JButton btn_sqrt = new JButton("sqrt");
btn_sqrt.setForeground(Color.BLUE);
p2_1.add(btn_MC); p2_1.add(btn_7);
p2_1.add(btn_8); p2_1.add(btn_9);
p2_1.add(btn_wind);p2_1.add(btn_sqrt);
JPanel p2_2 = new JPanel();
p2_2.setLayout(new GridLayout(1,6));
JButton btn_MR = new JButton("MR");
btn_MR.setForeground(Color.red);
JButton btn_4 = new JButton("4");
btn_4.setForeground(Color.BLUE);
btn_4.addActionListener(this);
JButton btn_5 = new JButton("5");
btn_5.setForeground(Color.BLUE);
btn_5.addActionListener(this);
JButton btn_6 = new JButton("6");
btn_6.setForeground(Color.BLUE);
btn_6.addActionListener(this);
JButton btn_star= new JButton("*");
btn_star.setForeground(Color.red);
JButton btn_mod = new JButton("%");
btn_mod.setForeground(Color.BLUE);
p2_2.add(btn_MR);
p2_2.add(btn_4); p2_2.add(btn_5);
p2_2.add(btn_6);
p2_2.add(btn_star);p2_2.add(btn_mod);
p2.add(p2_1);p2.add(p2_2);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(2,1));
JPanel p3_1 = new JPanel();
p3_1.setLayout(new GridLayout(1,6));
JButton btn_MS = new JButton("MS");
btn_MS.setForeground(Color.red);
JButton btn_1 = new JButton("1");
btn_1.setForeground(Color.BLUE);
btn_1.addActionListener(this);
JButton btn_2 = new JButton("2");
btn_2.setForeground(Color.BLUE);
btn_2.addActionListener(this);
JButton btn_3 = new JButton("3");
btn_3.setForeground(Color.BLUE);
btn_3.addActionListener(this);
JButton btn_sub= new JButton("-");
btn_sub.setForeground(Color.red);
JButton btn_reverse = new JButton("1/x");
btn_reverse.setForeground(Color.BLUE);
p3_1.add(btn_MS); p3_1.add(btn_1);
p3_1.add(btn_2); p3_1.add(btn_3);
p3_1.add(btn_sub);p3_1.add(btn_reverse);
JPanel p3_2 = new JPanel();
p3_2.setLayout(new GridLayout(1,6));
JButton btn_Madd = new JButton("M+");
btn_Madd.setForeground(Color.red);
JButton btn_0= new JButton("0");
btn_0.setForeground(Color.BLUE);
btn_0.addActionListener(this);
JButton btn_singal = new JButton("+/-");
btn_singal.setForeground(Color.BLUE);
btn_singal.addActionListener(this);
JButton btn_dot = new JButton(".");
btn_dot.addActionListener(this);
JButton btn_add= new JButton("+");
btn_add.setForeground(Color.red);
JButton btn_equal = new JButton("=");
btn_equal.setForeground(Color.red);
p3_2.add(btn_Madd);
p3_2.add(btn_0); p3_2.add(btn_singal);
p3_2.add(btn_dot);
p3_2.add(btn_add);p3_2.add(btn_equal);
p3.add(p3_1);p3.add(p3_2);
con.add(p1);con.add(p2);con.add(p3);
setVisible(true);
}
public void press_dot()
{
tag=false;
}
public void press_C()
{
text1.setText("0.");
tag=true;
}
public void press_BackSpace()
{
String orginStr = text1.getText();
if(orginStr.equals("0."))
text1.setText("0.");
else
{//是小數，即小數點後面有數字的情形
if(orginStr.indexOf(".")<orginStr.length()-1)
text1.setText(orginStr.substring(0,orginStr.length()-1));
else
{
if(orginStr.length()==2)
text1.setText("0.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf(".")-1)+".");
tag=true;
}
}
}
}
public void press_0()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("0.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"0.");
}
}
else
{
text1.setText(orginStr+"0");
}
}
public void press_1()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("1.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"1.");
}
}
else
{
text1.setText(orginStr+"1");
}
}
public void press_2()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("2.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"2.");
}
}
else
{
text1.setText(orginStr+"2");
}
}
public void press_3()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("3.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"3.");
}
}
else
{
text1.setText(orginStr+"3");
}
}
public void press_4()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("4.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"4.");
}
}
else
{
text1.setText(orginStr+"4");
}
}
public void press_5()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("5.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"5.");
}
}
else
{
text1.setText(orginStr+"5");
}
}
public void press_6()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("6.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"6.");
}
}
else
{
text1.setText(orginStr+"6");
}
}
public void press_7()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("7.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"7.");
}
}
else
{
text1.setText(orginStr+"7");
}
}
public void press_8()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("8.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"8.");
}
}
else
{
text1.setText(orginStr+"8");
}
}
public void press_9()
{
String orginStr=text1.getText();
if(tag)
{
if( orginStr.equals("0."))
text1.setText("9.");
else
{
text1.setText(orginStr.substring(0,orginStr.indexOf("."))+"9.");
}
}
else
{
text1.setText(orginStr+"9");
}
}
public void press_singal()
{
String orginStr=text1.getText();
if(signal)
{
text1.setText("-"+orginStr);
signal=false;
}
else
{
text1.setText(orginStr.substring(1,orginStr.length()));
signal=true;
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("C"))
this.press_C();
if(e.getActionCommand().equals("BackSpace"))
this.press_BackSpace();
if(e.getActionCommand().equals("."))
this.press_dot();
if(e.getActionCommand().equals("0"))
this.press_0();
if(e.getActionCommand().equals("1"))
this.press_1();
if(e.getActionCommand().equals("2"))
this.press_2();
if(e.getActionCommand().equals("3"))
this.press_3();
if(e.getActionCommand().equals("4"))
this.press_4();
if(e.getActionCommand().equals("5"))
this.press_5();
if(e.getActionCommand().equals("6"))
this.press_6();
if(e.getActionCommand().equals("7"))
this.press_7();
if(e.getActionCommand().equals("8"))
this.press_8();
if(e.getActionCommand().equals("9"))
this.press_9();
if(e.getActionCommand().equals("+/-"))
this.press_singal();
}
}
public class Calculator {
public static void main(String[] args)
{
new myWindows(200,200);
}
}
