实验十一:图形界面二

Posted 2022-01-02 baiyunchao

实验程序：

package shiyan;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class Jisuanqi extends Frame implements ActionListener
public Jisuanqi()
super("计算器");
Frame ff=new Frame("framework test");
ff.setSize(400,100);
ff.setLocation(300,240);
ff.setLayout(new FlowLayout());
final TextField f1=new TextField("10",8);
ff.add(f1);

Label l1=new Label("+");
ff.add(l1);
TextField f2=new TextField("10",8);
ff.add(f2);
Button b1=new Button("=");
ff.add(b1);
TextField f3=new TextField(10);
ff.add(f3);
ff.addWindowListener(new myclose());
ff.setVisible(true);
b1.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
double c;
String s1=f1.getText();
double a=Integer.parseInt(s1);
String s2=f2.getText();
double b=Integer.parseInt(s2);
c=a+b;
String m=String.valueOf(c);
f3.setText(m);

private double Integer(String s)
return 0;

);

class myclose implements WindowListener

public void windowActivated(WindowEvent arg0)

public void windowClosed(WindowEvent arg0)

public void windowClosing(WindowEvent arg0)
System.exit(0);

public void windowDeactivated(WindowEvent arg0)

public void windowDeiconified(WindowEvent arg0)
// TODO Auto-generated method stub

public void windowIconified(WindowEvent arg0)

public void windowOpened(WindowEvent arg0)

public static void main(String[] args)
new Jisuanqi();

public void actionPerformed(ActionEvent arg0)

二、结果

10+10=20

三、心得

 

1、创建按钮以后，要用add把它添加到窗口上

2、得到一个输入框中的内容用gettext

3、要先把输入框中的内容转换成字符串类型