?? textfieldframe.java
字號:
package component;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextFieldFrame extends JFrame implements FocusListener {
JPanel contentPane;
JTextField jTextField1 = new JTextField();
JTextField jTextField2 = new JTextField();
public TextFieldFrame() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
TextFieldFrame frame = new TextFieldFrame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
//居中對齊
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(null);
this.setSize(new Dimension(400, 300));
this.setTitle("編輯框示例");
jTextField1.setText("編輯框示例");
jTextField1.setBounds(new Rectangle(83, 83, 235, 33));
jTextField1.addFocusListener(this);
jTextField2.setText("編輯框示例");
jTextField2.setBounds(new Rectangle(83, 150, 235, 33));
jTextField2.addFocusListener(this);
contentPane.add(jTextField1, null);
contentPane.add(jTextField2, null);
}
public void focusGained(FocusEvent e) {
//取得激發事件的控件
JTextField tempTextField = (JTextField)e.getSource();
//選擇編輯框的字符串
tempTextField.setSelectionStart(0);
tempTextField.setSelectionEnd(tempTextField.getText().length());
}
public void focusLost(FocusEvent e) {
//取得激發事件的控件
JTextField tempTextField = (JTextField)e.getSource();
//取消編輯框的字符串的選擇
tempTextField.setSelectionStart(0);
tempTextField.setSelectionEnd(0);
}
}
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