textField1 과 textField2의 숫자를 입력하고 버튼을 누르면 textField3에 답이 나온다.
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
public class MyClass extends JFrame{
JTextField[] jTextField = new JTextField[3];
JButton[] jb = new JButton[5];
int i;
int location = 50;
public MyClass(){
setTitle("JTextfiled");
setSize(500,500);
setVisible(true);
JPanel panel = new JPanel();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.setLayout(null);
add(panel);
for(i = 0; i<jTextField.length; i++){
jTextField[i] = new JTextField();
jTextField[i].setBounds(location, 100, 80, 30);
location += 100;
panel.add(jTextField[i]);
}
location = 50;
for(i = 0; i<jb.length;i++){
jb[i] = new JButton(" ");
jb[i].setBounds(location, 300, 50, 30);
jb[i].addActionListener(new MyListen());
location += 50;
panel.add(jb[i]);
}
jb[0].setText("+");
jb[1].setText("-");
jb[2].setText("*");
jb[3].setText("/");
jb[4].setText("%");
}
public static void main(String args[]){
new MyClass();
}
class MyListen implements ActionListener{
double temp;
public void actionPerformed(ActionEvent e){
DecimalFormat df = new DecimalFormat("0.###");
double a = Double.parseDouble(jTextField[0].getText());
double b = Double.parseDouble(jTextField[1].getText());
if(e.getSource() == jb[0]){
temp = a + b);
}
if(e.getSource() == jb[1]){
temp = a - b;
}
if(e.getSource() == jb[2]){
temp = a * b;
}
if(e.getSource() == jb[3]){
temp = a / b;
}
if(e.getSource() == jb[4]){
temp = a % b;
}
//jTextField[2].setText(Double.toString(temp));
jTextField[2].setText(df.format(temp));
}
}
}
| cs |
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