更改JFrame标题

Question

这段代码可以编译，我只是无法在标题栏上更改名称。

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import javax.swing.JButton;  
import javax.swing.JFrame;  
import javax.swing.JLabel;  
import javax.swing.JPanel;  
import javax.swing.JTabbedPane;  
import javax.swing.JTextArea;  
import javax.swing.JTextField;  
public class VolumeCalculator extends JFrame implements ActionListener  
{  
    private JTabbedPane jtabbedPane;  
    private JPanel options;  
    JTextField poolLengthText, poolWidthText, poolDepthText, poolVolumeText, hotTub,  
            hotTubLengthText, hotTubWidthText, hotTubDepthText, hotTubVolumeText, temp, results,
            myTitle;  
    JTextArea labelTubStatus;  
    public VolumeCalculator()  
    {  
        setSize(400, 250);  
        setVisible(true);  
        setSize(400, 250);  
        setVisible(true);  
        setTitle("Volume Calculator");  
        setSize(300, 200);  
        JPanel topPanel = new JPanel();  
        topPanel.setLayout(new BorderLayout());  
        getContentPane().add(topPanel);

        createOptions();

        jtabbedPane = new JTabbedPane();

        jtabbedPane.addTab("Options", options);

        topPanel.add(jtabbedPane, BorderLayout.CENTER);  
    } 
    /* CREATE OPTIONS */

    public void createOptions()  
    {  
        options = new JPanel();  
        options.setLayout(null);  
        JLabel labelOptions = new JLabel("Change Company Name:");  
        labelOptions.setBounds(120, 10, 150, 20);  
        options.add(labelOptions);  
        JTextField newTitle = new JTextField("Some Title"); 
        newTitle.setBounds(80, 40, 225, 20);  
        options.add(newTitle);
        myTitle = new JTextField();   
        myTitle.setBounds(80, 40, 225, 20); 
        myTitle.add(labelOptions); 
        JButton newName = new JButton("Set New Name");  
        newName.setBounds(60, 80, 150, 20);  
        newName.addActionListener(this);  
        options.add(newName);  
        JButton Exit = new JButton("Exit");  
        Exit.setBounds(250, 80, 80, 20);  
        Exit.addActionListener(this);  
        options.add(Exit);  
    }  
    public void actionPerformed(ActionEvent event)  
    {  
        JButton button = (JButton) event.getSource();  
        String buttonLabel = button.getText();  
        if ("Exit".equalsIgnoreCase(buttonLabel))  
        {  
            Exit_pressed();  
            return;  
        }  
        if ("Set New Name".equalsIgnoreCase(buttonLabel))  
        {  
            New_Name();  
            return;  
        }  
    }  
    private void Exit_pressed()  
    {  
        System.exit(0);  
    }  
    private void New_Name()  
    {  
        this.setTitle(myTitle.getText());  
    }  
    private void Options()  
    {  
    }  
    public static void main(String[] args)  
    {  
        JFrame frame = new VolumeCalculator();  
        frame.setSize(380, 350);  
        frame.setVisible(true);  
    }  
}

Answer 1

如果您的课程扩展了JFrame，请使用 this.setTitle(newTitle.getText());

如果没有，并且包含一个名为myFrame的JFrame，则使用 myFrame.setTitle(newTitle.getText());

现在，您已经发布了程序，很明显，您只需要一个JTextField即可获得新标题。这些更改将达到目的：

JTextField poolLengthText, poolWidthText, poolDepthText, poolVolumeText, hotTub,
        hotTubLengthText, hotTubWidthText, hotTubDepthText, hotTubVolumeText, temp, results,
        newTitle;

和：

    public void createOptions()
    {
        options = new JPanel();
        options.setLayout(null);
        JLabel labelOptions = new JLabel("Change Company Name:");
        labelOptions.setBounds(120, 10, 150, 20);
        options.add(labelOptions);
        newTitle = new JTextField("Some Title");
        newTitle.setBounds(80, 40, 225, 20);
        options.add(newTitle);
//        myTitle = new JTextField("My Title...");
//        myTitle.setBounds(80, 40, 225, 20);
//        myTitle.add(labelOptions);
        JButton newName = new JButton("Set New Name");
        newName.setBounds(60, 80, 150, 20);
        newName.addActionListener(this);
        options.add(newName);
        JButton Exit = new JButton("Exit");
        Exit.setBounds(250, 80, 80, 20);
        Exit.addActionListener(this);
        options.add(Exit);
    }

和：

private void New_Name()
{
    this.setTitle(newTitle.getText());
}