如何更改所有私有JLabel的字体大小

Question

我也有类似的问题,比如这个,但对我来说我有25+私人Jlabel之下,我给了,当我宣布它的值.我在构造函数中使用GridBagLayout将这些JLabel添加到JPanel.如果我按照链接中给出的答案行使用某些内容,则只会更改构造函数中添加的JLabel.

所以在我看来,如果我想改变我的私有JLabel的字体大小,我将不得不单独定义它们的字体大小,或者更改构造函数中的默认值,然后添加我的JLabel.但是,我确信必须有另一种更简单的方法,但我只是没有经验或理解来解决它,或者从其他类似问题的答案中做出适当的调整.

我不认为这确实需要我展示我的代码,但如果它有帮助我可以这样做.

public class LaborRecordPanel implements
Printable, ActionListener {

private Color shade = new Color(201,201,201);

private ImageIcon logoIcon = new ImageIcon("Images/fici_logo1.jpg");
private JLabel logoLabel = new JLabel(logoIcon);

private JLabel authorizedBy = new JLabel("AUTHORIZED BY:");
private JLabel toCertify = new JLabel("THIS IS TO CERTIFY THAT THE ABOVE LABOR HAS BEEN PERFORMED.");

private JLabel laborRecordNO = new JLabel("NO.");
private JLabel nameOfJob = new JLabel("NAME OF JOB:");
private JLabel customerPO = new JLabel("CUSTOMER PO #:");
private JLabel contractNO = new JLabel("CONTRACT NO.");
private JLabel weekEnding = new JLabel("WEEK ENDING");
private JComboBox laborRateDescription = new JComboBox();
//...

JPanel rp = new JPanel();
JScrollPane scrollPane = new JScrollPane(rp);
LaborRecordPanel(){
    //Font oldLabelFont = UIManager.getFont("Label.font");
    //UIManager.put("Label.font",oldLabelFont.deriveFont(Font.PLAIN));
    //UIManager.put("Label.font", UIManager.getFont("Label.font").deriveFont(40));
    //SwingUtilities.updateComponentTreeUI(rp);
    rp.setPreferredSize(new Dimension(1295,1830 ));
    scrollPane.getVerticalScrollBar().setUnitIncrement(16); //increase the scroll speed

    GridBagLayout gridbag = new GridBagLayout();
    rp.setBackground(Color.WHITE);
    rp.setBorder(BorderFactory.createLineBorder(Color.BLACK, 1));
    GridBagConstraints gbc = new GridBagConstraints();
    rp.setLayout(gridbag);
    //gbc.insets = new Insets(5, 5, 5, 5);

    //row 0////////////////////////////////////////////////////////////
    gbc.fill = GridBagConstraints.BOTH;
    gbc.gridx = 10;
    gbc.gridy = 0;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridheight = 1;
    gbc.gridwidth = 1;
    laborRecordNO.setHorizontalAlignment(JLabel.CENTER);
    laborRecordNO.setFont(new Font("Dialog", Font.PLAIN, 18));
    gridbag.setConstraints(laborRecordNO, gbc);
    rp.add(laborRecordNO, gbc);

    //row 1////////////////////////////////////////////////////////////
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.gridwidth = 13;
    gridbag.setConstraints(logoLabel, gbc);
    rp.add(logoLabel, gbc);

    //row 2////////////////////////////////////////////////////////////
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.gridheight = 1;
    gbc.gridwidth = 1;
    gridbag.setConstraints(nameOfJob, gbc);
    rp.add(nameOfJob, gbc);

    gbc.gridx = 6;
    gbc.gridy = 2;
    gbc.gridheight = 1;
    gbc.gridwidth = 3;
    gridbag.setConstraints(contractNO, gbc);
    rp.add(contractNO, gbc);
 //... more setting constraints and adding
 }
 }

Answer 1

您可以更改UIManager标签的默认值.deriveFont()在现有默认值上使用可能更美观.应在使用之前构建GUI 之前进行更改EventQueue.invokeLater().

Font f = (Font) UIManager.get("Label.font");
UIManager.put("Label.font", f.deriveFont(36f));
EventQueue.invokeLater(new Runnable() {…}