스윙 계산기
6706 단어 swing
package cn.tisson.test;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JTextField txtResult;
private JButton btnZero, btnOne, btnTwo, btnThree, btnFour, btnFive,
btnSix, btnSeven, btnEight, btnNine, btnPlus, btnMinus, btnTimes,
btnDivided, btnEqual, btnPoint, btnC, btnCE, btnSqrt, btnPlusMinus;
int z;
double x, y;
StringBuffer str;
public Calculator() {
super(" ");
this.setSize(311, 231);
this.setLocation(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(new GridLayout(1, 1));//
JPanel panel = new JPanel(new GridLayout(6, 1));// 6 1
this.add(panel);
txtResult = new JTextField("0");
Color BackColor = new Color(255, 255, 255);
Color ForeColor = new Color(0, 0, 0);
txtResult.setBackground(BackColor);
txtResult.setForeground(ForeColor);
panel.add(txtResult);
txtResult.setHorizontalAlignment(JTextField.RIGHT);
txtResult.setEnabled(false);
// text.setEnabled(true);
JPanel panel_1 = new JPanel(new GridLayout(1, 4));
panel.add(panel_1);
btnSqrt = new JButton("sqrt");
panel_1.add(btnSqrt);
btnSqrt.addActionListener(this);
btnPlusMinus = new JButton("+/-");
panel_1.add(btnPlusMinus);
btnPlusMinus.addActionListener(this);
btnCE = new JButton("CE");
panel_1.add(btnCE);
btnCE.addActionListener(this);
btnC = new JButton("C");
panel_1.add(btnC);
btnC.addActionListener(this);
JPanel panel_2 = new JPanel(new GridLayout(1, 4));
panel.add(panel_2);
btnSeven = new JButton("7");
panel_2.add(btnSeven);
btnSeven.addActionListener(this);
btnEight = new JButton("8");
panel_2.add(btnEight);
btnEight.addActionListener(this);
btnNine = new JButton("9");
panel_2.add(btnNine);
btnNine.addActionListener(this);
btnDivided = new JButton("/");
panel_2.add(btnDivided);
btnDivided.addActionListener(this);
JPanel panel_3 = new JPanel(new GridLayout(1, 4));
panel.add(panel_3);
btnFour = new JButton("4");
panel_3.add(btnFour);
btnFour.addActionListener(this);
btnFive = new JButton("5");
panel_3.add(btnFive);
btnFive.addActionListener(this);
btnSix = new JButton("6");
panel_3.add(btnSix);
btnSix.addActionListener(this);
btnTimes = new JButton("*");
panel_3.add(btnTimes);
btnTimes.addActionListener(this);
JPanel panel_4 = new JPanel(new GridLayout(1, 4));
panel.add(panel_4);
btnOne = new JButton("1");
panel_4.add(btnOne);
btnOne.addActionListener(this);
btnTwo = new JButton("2");
panel_4.add(btnTwo);
btnTwo.addActionListener(this);
btnThree = new JButton("3");
panel_4.add(btnThree);
btnThree.addActionListener(this);
btnMinus = new JButton("-");
panel_4.add(btnMinus);
btnMinus.addActionListener(this);
JPanel panel_5 = new JPanel(new GridLayout(1, 4));
panel.add(panel_5);
btnZero = new JButton("0");
panel_5.add(btnZero);
btnZero.addActionListener(this);
btnPoint = new JButton(".");
panel_5.add(btnPoint);
btnPoint.addActionListener(this);
btnEqual = new JButton("=");
panel_5.add(btnEqual);
btnEqual.addActionListener(this);
btnPlus = new JButton("+");
panel_5.add(btnPlus);
btnPlus.addActionListener(this);
str = new StringBuffer();
this.setVisible(true);
}
public void windowClosing(WindowEvent a) {
System.exit(0);
}
public void actionPerformed(ActionEvent e) {
try {
if (e.getSource() == btnC) {
txtResult.setText("0");
str.setLength(0);
} else if (e.getSource() == btnCE) {
txtResult.setText("0.");
str.setLength(0);
} else if (e.getSource() == btnPlusMinus) {
x = Double.parseDouble(txtResult.getText().trim());
txtResult.setText("" + (-x));
}
else if (e.getSource() == btnPlus) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 1;
} else if (e.getSource() == btnMinus) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 2;
} else if (e.getSource() == btnTimes) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 3;
} else if (e.getSource() == btnDivided) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 4;
} else if (e.getSource() == btnEqual) {
str.setLength(0);
switch (z) {
case 1:
txtResult.setText("" + (x + y));
break;
case 2:
txtResult.setText("" + (x - y));
break;
case 3:
txtResult.setText("" + (x * y));
break;
case 4:
txtResult.setText("" + (x / y));
break;
}
}
else if (e.getSource() == btnPoint) {
if (txtResult.getText().trim().indexOf('.') != -1)//
{
} else//
{
if (txtResult.getText().trim().equals("0"))// 0
{
str.setLength(0);
txtResult.setText((str.append("0"
+ e.getActionCommand())).toString());
} else if (txtResult.getText().trim().equals(""))//
{
} else {
txtResult.setText(str.append(e.getActionCommand())
.toString());
}
}
y = 0d;
}
else if (e.getSource() == btnSqrt)//
{
x = Double.parseDouble(txtResult.getText().trim());
txtResult.setText(" ");
if (x < 0)
txtResult.setText(" ");
else
txtResult.setText("" + Math.sqrt(x));
str.setLength(0);
y = 0d;
}
else if (e.getSource() == btnZero)// "0"
{
if (txtResult.getText().trim().equals("0"))//
{
} else {
txtResult.setText(str.append(e.getActionCommand())
.toString());
y = Double.parseDouble(txtResult.getText().trim());
}
}
else//
{
txtResult.setText(str.append(e.getActionCommand()).toString());
y = Double.parseDouble(txtResult.getText().trim());
}
} catch (NumberFormatException ae) {
txtResult.setText(" ");
} catch (StringIndexOutOfBoundsException ae) {
txtResult.setText(" ");
}
}
public static void main(String arg[]) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
new Calculator();
}
}
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