Use UIManager to set fonts, foreground color, background color, select color, border for Swing components

Once you set the properties in the UIManager, all your Swing components will have the corresponding look and feel.

public void setLookAndFeel () {

        Font plainFont = new Font("Serif", Font.PLAIN, 12);
        Font boldFont = new Font("Serif", Font.BOLD, 12);

        Color focusColor = Color.BLUE;
        Color backgroundColor = Color.YELLOW;
        Color disabledForgroundColor = Color.GREY;
        Color selectColor = Color.LIGHT_GRAY;

        UIManager.put("Text.font", new FontUIResource(plainFont));
        UIManager.put("TextField.font", new FontUIResource(plainFont));
        UIManager.put("FormattedTextField.font", new FontUIResource(plainFont));
        UIManager.put("PasswordField.font", new FontUIResource(boldFont));
        UIManager.put("TextArea.font", new FontUIResource(plainFont));
        UIManager.put("TextPane.font", new FontUIResource(plainFont));
        UIManager.put("List.font", new FontUIResource(plainFont));
        UIManager.put("Table.font", new FontUIResource(plainFont));
        UIManager.put("TableHeader.font", new FontUIResource(plainFont));
                   
        UIManager.put("CheckBox.font", new FontUIResource(plainFont));
        UIManager.put("RadioButton.font", new FontUIResource(plainFont));
        UIManager.put("Button.font",new FontUIResource(boldFont));
        UIManager.put("Button.focus", new ColorUIResource(focusColor));
        UIManager.put("Button.border", new LineBorder(Color.ORANGE, 5, true));
        UIManager.put("ComboBox.font", new FontUIResource(plainFont));
        UIManager.put("ComboBox.TableHeader.font", new FontUIResource(plainFont)); 
        UIManager.put("Label.font", new FontUIResource(plainFont));
        UIManager.put("ToolTip.font", new FontUIResource(boldFont));
        UIManager.put("ToggleButton.font", new FontUIResource(plainFont));
        UIManager.put("TitledBorder.font", new FontUIResource(boldFont));
     
        UIManager.put("Menu.font", new FontUIResource(boldFont));
        UIManager.put("MenuItem.font", new FontUIResource(boldFont));
        UIManager.put("MenuBar.font", new FontUIResource(boldFont));
        UIManager.put("PopupMenu.font", new FontUIResource(boldFont));
        UIManager.put("RadioButtonMenuItem.font", new FontUIResource(boldFont));
        UIManager.put("CheckBoxMenuItem.font", new FontUIResource(boldFont));
        UIManager.put("MenuItem.acceleratorFont", new FontUIResource(boldFont));
        UIManager.put("CheckBoxMenuItem.acceleratorFont", new FontUIResource(boldFont));
        UIManager.put("Menu.acceleratorFont", new FontUIResource(boldFont));
        UIManager.put("RadioButtonMenuItem.acceleratorFont", new FontUIResource(boldFont));
     
        UIManager.put("ToolBar.font", new FontUIResource(boldFont));
        UIManager.put("MenuBar.font", new FontUIResource(boldFont));
        UIManager.put("Panel.font", new FontUIResource(boldFont));
        UIManager.put("ProgressBar.font", new FontUIResource(boldFont));
        UIManager.put("OptionPane.font", new FontUIResource(boldFont));
        UIManager.put("OptionPane.buttonFont", new FontUIResource(boldFont));
        UIManager.put("OptionPane.messageFont", new FontUIResource(plainFont));
        UIManager.put("ScrollPane.font", new FontUIResource(boldFont));
        UIManager.put("EditorPane.font", new FontUIResource(plainFont));
        UIManager.put("ColorChooser.font", new FontUIResource(boldFont));
        UIManager.put("InternalFrame.titleFont", new FontUIResource(boldFont));
        UIManager.put("TabbedPane.font", new FontUIResource(boldFont));

        UIManager.put("Panel.background", backgroundColor);
        UIManager.put("CheckBox.background", backgroundColor);
        UIManager.put("RadioButton.background", backgroundColor);
        UIManager.put ("Button.select", selectColor);
UIManager.put ("ToggleButton.select", selectColor);
        UIManager.put("ComboBox.disabledBackground", backgroundColor);
        UIManager.put("ComboBox.fieldBackground", backgroundColor);
        UIManager.put("ComboBox.disabledForeground", disabledForgroundColor);
        UIManager.put("OptionPane.background", backgroundColor);
        UIManager.put("OptionPane.warningDialog.border.background", backgroundColor);

        UIManager.put("Label.background", backgroundColor);

        UIManager.put("TextField.shadow", backgroundColor);
        UIManager.put("TextField.background", backgroundColor); 
    }

Reference:

1. Swing UIManager Keys
2. Nimbus Defaults

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