JAVA实验三
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天津理工大学实验报告
1．
源代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class oyf10_3{
public static void main(String args[])
{ ComputerFrame fr=new ComputerFrame();
fr.setTitle("计算");
}
}
class ComputerFrame extends JFrame implements ActionListener{ JTextField text1,text2,text3;
JButton button1,button2,button3,button4;
JLabel label;
public ComputerFrame(){
setLayout(new FlowLayout());
text1=new JTextField(10);
text2=new JTextField(10);
text3=new JTextField(10);
label=new JLabel(" ",JLabel.CENTER);
label.setBackground(Color.green);
add(text1);
add(label);
add(text2);
add(text3);
button1=new JButton("加");
button2=new JButton("减");
button3=new JButton("乘");
button4=new JButton("除");
add(button1);
add(button2);
add(button3);
add(button4);
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
setSize(300,320);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
validate();
}
public void actionPerformed(ActionEvent e)
{ double n;
if(e.getSource()==button1)
{ double n1,n2;
try{ n1=Double.parseDouble(text1.getText());
n2=Double.parseDouble(text2.getText());
n=n1+n2;
text3.setText(String.valueOf(n));
label.setText("+");
}
catch(NumberFormatException ee)
{ text3.setText("请输入数字字符");
}
}
else if(e.getSource()==button2)
{ double n1,n2;
try{ n1=Double.parseDouble(text1.getText());
n2=Double.parseDouble(text2.getText());
n=n1-n2;
text3.setText(String.valueOf(n));
label.setText("-");
}
catch(NumberFormatException ee)
{ text3.setText("请输入数字字符");
}
}
else if(e.getSource()==button3)
{double n1,n2;
try{ n1=Double.parseDouble(text1.getText());
n2=Double.parseDouble(text2.getText());
n=n1*n2;
text3.setText(String.valueOf(n));
label.setText("*");
}
catch(NumberFormatException ee)
{ text3.setText("请输入数字字符");
}
}
else if(e.getSource()==button4)
{double n1,n2;
try{ n1=Double.parseDouble(text1.getText());
n2=Double.parseDouble(text2.getText());
n=n1/n2;
text3.setText(String.valueOf(n));
label.setText("/");
}
catch(NumberFormatException ee)
{ text3.setText("请输入数字字符");
}
}
validate();
}
}