设置 JTextArea 的字体

Question

我想用Java创建一个文本编辑器。这是我到目前为止写的：

package com.thundercrust.applications;
import java.awt.BorderLayout;
public class TextEditor implements ActionListener{
private static String[] fontOptions = {"Serif", "Agency FB", "Arial", "Calibri", "Cambrian", "Century Gothic", "Comic Sans MS", "Courier New", "Forte", "Garamond", "Monospaced", "Segoe UI", "Times New Roman", "Trebuchet MS", "Serif"};
private static String[] sizeOptions = {"8", "10", "12", "14", "16", "18", "20", "22", "24", "26", "28"};
ImageIcon newIcon = new ImageIcon("res/NewIcon.png");
ImageIcon saveIcon = new ImageIcon("res/SaveIcon.png");
ImageIcon openIcon = new ImageIcon("res/OpenIcon.png");
ImageIcon fontIcon = new ImageIcon("res/FontIcon.png");
ImageIcon changeFontIcon = new ImageIcon("res/ChangeFontIcon.png");
JButton New = new JButton(newIcon);
JButton Save = new JButton(saveIcon);
JButton Open = new JButton(openIcon);
JButton changeFont = new JButton(changeFontIcon);
JLabel fontLabel = new JLabel(fontIcon);
JLabel fontLabelText = new JLabel("Font: ");
JLabel fontSizeLabel = new JLabel("Size: ");
JComboBox <String> fontName = new JComboBox<>(fontOptions);
JComboBox <String> fontSize = new JComboBox<>(sizeOptions);
JToolBar tool = new JToolBar();
JTextArea texty = new JTextArea();
JScrollPane scroll = new JScrollPane(texty);
private static final int WIDTH = 1366;
private static final int HEIGHT = WIDTH / 16 * 9;
private static String name = "Text Editor"; 
private static JFrame frame = new JFrame();
public void Display() {
    frame.setTitle(name);
    frame.setSize(WIDTH, HEIGHT);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setResizable(false);
    frame.setVisible(true);
    New.addActionListener(this);
    New.setToolTipText("Creates a new File");
    Save.addActionListener(this);
    Save.setToolTipText("Saves the current File");
    Open.addActionListener(this);
    Open.setToolTipText("Opens a file");
    changeFont.addActionListener(this);
    changeFont.setToolTipText("Change the Font");
    fontLabel.setToolTipText("Font");
    fontLabelText.setToolTipText("Set the kind of Font");
    fontSizeLabel.setToolTipText("Set the size of the Font");
    tool.add(New);
    tool.addSeparator();
    tool.add(Save);
    tool.addSeparator();
    tool.add(Open);
    tool.addSeparator();
    tool.addSeparator();
    tool.addSeparator();
    tool.add(fontLabel);
    tool.addSeparator();
    tool.add(fontLabelText);
    tool.add(fontName);
    tool.addSeparator();
    tool.add(fontSizeLabel);
    tool.add(fontSize);
    tool.addSeparator();
    tool.add(changeFont);
    JPanel pane = new JPanel();
    pane.setLayout(new BorderLayout());
    pane.add(tool, "North");
    pane.add(scroll, "Center");
    frame.setContentPane(pane);
}
public static void main(String args[]) {
    TextEditor editor = new TextEditor();
    editor.Display();
}
public void actionPerformed(ActionEvent evt) {
    String fontNameSet;
    String fontSizeSetTemp;
    int fontSizeSet;
    Object source = evt.getSource();
    if(source == New) {
        texty.setText("");
    }
    else if(source == changeFont) {
        fontNameSet = (String) fontName.getSelectedItem();
        fontSizeSetTemp = (String) fontSize.getSelectedItem();
        fontSizeSet = Integer.parseInt(fontSizeSetTemp);
        System.out.println(fontNameSet + fontSizeSet);
        scroll.setFont(new Font(fontNameSet, fontSizeSet, Font.PLAIN));
    }
}
}

我的问题是为JTextArea设置字体。 当我单击实际程序上的changeFont按钮时，没有任何反应。我该怎么办？

Answer 1

new Font(fontNameSet, fontSizeSet, Font.PLAIN)

这有错误的参数顺序。它应该是：

new Font(fontNameSet, Font.PLAIN, fontSizeSet)

另外，正如评论中提到的：

scroll.setFont(new Font(fontNameSet, fontSizeSet, Font.PLAIN));

应该是：

texty.setFont(new Font(fontNameSet, Font.PLAIN, fontSizeSet));