public class E4 extends JFrame{
private JDialog jd;
private JButton jb;
private JLabel jl;
public E4(){
JFrame jf=new JFrame("事件");
jb=new JButton("开始");
jl=new JLabel("结果");
jd=new JDialog(this,"对话框",true);
jd.setBounds(200,200,200,200);
JTextField jta=new JTextField("");
String s=jta.getText();
jl.setText(s);
jb.addActionListener(new MyListener());
jf.setLayout(new FlowLayout());
jf.add(jb);
jd.add(jl);
jf.add(jta);
setBounds(400,400,400,400);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(400,400);
jf.setVisible(true);
}
class MyListener implements ActionListener{
public void actionPerformed(ActionEvent e){
jd.setVisible(true);
}}
public static void main(String[] args) {
// TODO Auto-generated method stub
new E4();
}一个小练习,在文本域输入字符,然后在JDialog显示刚才输入的字符,可是这个程序的结果是JDialog没显示刚才输入的结果,求大神指点
private JDialog jd;
private JButton jb;
private JLabel jl;
public E4(){
JFrame jf=new JFrame("事件");
jb=new JButton("开始");
jl=new JLabel("结果");
jd=new JDialog(this,"对话框",true);
jd.setBounds(200,200,200,200);
JTextField jta=new JTextField("");
String s=jta.getText();
jl.setText(s);
jb.addActionListener(new MyListener());
jf.setLayout(new FlowLayout());
jf.add(jb);
jd.add(jl);
jf.add(jta);
setBounds(400,400,400,400);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(400,400);
jf.setVisible(true);
}
class MyListener implements ActionListener{
public void actionPerformed(ActionEvent e){
jd.setVisible(true);
}}
public static void main(String[] args) {
// TODO Auto-generated method stub
new E4();
}一个小练习,在文本域输入字符,然后在JDialog显示刚才输入的字符,可是这个程序的结果是JDialog没显示刚才输入的结果,求大神指点
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;public class E4 extends JFrame {
private JDialog jd; private JButton jb; private JLabel jl;
JTextField jta = new JTextField("");
public E4() {
JFrame jf = new JFrame("事件");
jb = new JButton("开始");
jl = new JLabel("结果");
jd = new JDialog(this, "对话框", true);
jd.setBounds(200, 200, 200, 200);
jta.setPreferredSize(new Dimension(100,20));
String s = jta.getText();
jl.setText(s);
jb.addActionListener(new MyListener());
jf.setLayout(new FlowLayout());
jf.add(jb);
jd.add(jl);
jf.add(jta);
setBounds(400, 400, 400, 400);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(400, 400);
jf.setVisible(true);
} class MyListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
jl.setText(jta.getText());
jd.setVisible(true);
}
} public static void main(String[] args) {
// TODO Auto-generated method stub
new E4();
}
}
你需要在里面加上jl.setText(jta.getText()).
这样的话你的jta也要声明在构造方法以外
否则后面识别不了