Question

java窗体 两数相加

用java窗体实现两数相加的程序怎么写？

Answer 1

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class FuctJFrame extends JFrame implements ActionListener{
/**
*
*/
private static final long serialVersionUID = 1L;
JLabel jlabel=new JLabel("请输入两个数:");
JLabel jlabel1=new JLabel();
JTextField jtextfield=new JTextField();
JButton jbutton=new JButton("=");
JTextField jtextfield1=new JTextField();
public FuctJFrame(){
setSize(300,300);
setTitle("求两数相加");
setLocation(251,251);
getContentPane().setLayout(null);
jlabel.setBounds(new Rectangle(100,50,100,20));
jtextfield.setBounds(new Rectangle(100,80,100,20));
jtextfield1.setBounds(new Rectangle(100,110,100,20));
jbutton.setBounds(new Rectangle(115,140,70,20));
jlabel1.setBounds(new Rectangle(120,200, 100, 20));
jlabel1.setForeground(Color.RED);
jbutton.addActionListener(this);
getContentPane().add(jlabel);
getContentPane().add(jtextfield);
getContentPane().add(jbutton);
getContentPane().add(jtextfield1);
getContentPane().add(jlabel1);
}
public void actionPerformed(ActionEvent e){
try{
double sum;
sum=Double.parseDouble(jtextfield.getText())+Double.parseDouble(jtextfield1.getText());
jlabel1.setText(""+sum);
}catch(Exception ex){
JOptionPane.showMessageDialog(this,"请输入数字");
}
}
public static void main(String[]arqs){
FuctJFrame x=new FuctJFrame();
x.setVisible(true);
}

}

Answer 2

分别从文本框中得到输入的数据，然后将数据转换成int类型直接相加，再将相加的结果转换成字符串显示在窗体中就行了！

Answer 3

才五分?太少了...