[英]how to edit awt textfield via code
我找不到如何在AWT文本框中更改文本的方法。 我已经尝试过了:
textBox1.setText("text");
textBox1.validate();
要么
textBox1.setText("text");
textBox1.repaint();
它们都不起作用。 这可能是什么问题?
看这个例子,我如何设置文本到文本字段
import java.awt.*;
import java.awt.event.*;
public class AwtControlDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
public AwtControlDemo(){
prepareGUI();
}
public static void main(String[] args){
AwtControlDemo awtControlDemo = new AwtControlDemo();
awtControlDemo.showTextFieldDemo();
}
private void prepareGUI(){
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showTextFieldDemo(){
headerLabel.setText("Control in action: TextField");
Label namelabel= new Label("User ID: ", Label.CENTER);
final TextField userText = new TextField(16);
userText.setText("name");
Button displayButton = new Button("Display");
displayButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String data = "Username: " + userText.getText();
statusLabel.setText(data);
}
});
controlPanel.add(namelabel);
controlPanel.add(userText);
controlPanel.add(displayButton);
mainFrame.setVisible(true);
}
}
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