实验十一：图形界面二
一、源代码
package jisuanqi2;
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());
//this.add(new TextField("10",8));
final TextField f1=new TextField("10",8);
ff.add(f1);
//this.add(new Label("+"));
Label l1=new Label("+");
ff.add(l1);
//this.add(new TextField("20",8));
TextField f2=new TextField("20",8);
ff.add(f2);
//this.add(new Button("="));
Button b1=new Button("=");
ff.add(b1);
//this.add(new TextField(10));
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) {
// TODO Auto-generated method stub
return 0;
}
});
}
class myclose implements WindowListener{
public void windowActivated(WindowEvent arg0) {
// TODO Auto-generated method stub
}
public void windowClosed(WindowEvent arg0) {
// TODO Auto-generated method stub
}
public void windowClosing(WindowEvent arg0) {
// TODO Auto-generated method stub
System.exit(0);
}
public void windowDeactivated(WindowEvent arg0) {
// TODO Auto-generated method stub
}
public void windowDeiconified(WindowEvent arg0) {
// TODO Auto-generated method stub
}
public void windowIconified(WindowEvent arg0) {
// TODO Auto-generated method stub
}
public void windowOpened(WindowEvent arg0) {
// TODO Auto-generated method stub
}
}
public static void main(String[] args) {
// TODO 自动生成的方法存根
new Jisuanqi();
}
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
}
二、结果
三、心得
1、可以自己创建一个frame,可以不用书上的方法创建一个窗口
2、创建按钮以后，要用add把它添加到窗口上
3、得到一个输入框中的内容用gettext
4、要先把输入框中的内容转换成字符串类型
