import java.awt.*;
import javax.swing.*;import java.awt.event.*;
import java.util.EventObject;public class texttest {
public static void main(String args[]){
new frame();
frame f = new frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setSize(60, 100);
f.setBounds(500,500,500,100);
}
}class frame extends JFrame{
public frame(){
panel p= new panel();
Container c = getContentPane();
c.add(p,BorderLayout.EAST);}
}class panel extends JPanel{
public panel(){
JTextField text = new JTextField();
add(text);
text.setColumns(50);
text.addActionListener(new action());
text.setEchoChar('*');
}
}class action implements ActionListener{
public void actionPerformed(ActionEvent e){
JTextField text=(JTextField)e.getSource();
System.out.println(text.getText());
text.setText(" ");
}
}
我想在textfield输入时显示星号,但弄不好,text.setEchoChar('*');,但会报错
另外界面默认的布局是显示不到textfield的,需要手动拖动下上边框,请问如何解决呢?
import javax.swing.*;import java.awt.event.*;
import java.util.EventObject;public class texttest {
public static void main(String args[]){
new frame();
frame f = new frame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setSize(60, 100);
f.setBounds(500,500,500,100);
}
}class frame extends JFrame{
public frame(){
panel p= new panel();
Container c = getContentPane();
c.add(p,BorderLayout.EAST);}
}class panel extends JPanel{
public panel(){
JTextField text = new JTextField();
add(text);
text.setColumns(50);
text.addActionListener(new action());
text.setEchoChar('*');
}
}class action implements ActionListener{
public void actionPerformed(ActionEvent e){
JTextField text=(JTextField)e.getSource();
System.out.println(text.getText());
text.setText(" ");
}
}
我想在textfield输入时显示星号,但弄不好,text.setEchoChar('*');,但会报错
另外界面默认的布局是显示不到textfield的,需要手动拖动下上边框,请问如何解决呢?
要不你把窗口放大些不就行了?
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.EventObject; public class TextTest {
public static void main(String args[]){
new PasswordJFrame();
PasswordJFrame f = new PasswordJFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setSize(60, 500);
f.setBounds(500,500,500,100);
}
} class PasswordJFrame extends JFrame{
public PasswordJFrame(){
PasswordJPanel p= new PasswordJPanel();
Container c = getContentPane();
c.add(p,BorderLayout.EAST);
}
} class PasswordJPanel extends JPanel{
public PasswordJPanel(){
JPasswordField text = new JPasswordField();
add(new JLabel("请输入密码"));
add(text);
text.setColumns(10);
text.addActionListener(new Action());
}
} class Action implements ActionListener{
public void actionPerformed(ActionEvent e){
JTextField text=(JTextField)e.getSource();
System.out.println(text.getText());
text.setText("");
}
}