import java.awt.BorderLayout;
import java.awt.Font;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * Implements to get the font type.
 * @author Wind
 */
public class TestFont extends JFrame{
    private static final long serialVersionUID = 1L;
    JLabel lblTest = new JLabel("test");
    JPanel pnlMain = new JPanel();
    public TestFont(){
        lblTest.setFont(new Font(Font.DIALOG, Font.BOLD, 12));
        pnlMain.setLayout(new BorderLayout());
        pnlMain.add(lblTest, BorderLayout.CENTER);
        this.add(pnlMain);
        printFontType();
    }
    
    private void printFontType(){
        System.out.println(lblTest.getFont().getFontName());
    }
    
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        TestFont t = new TestFont();
        t.setSize(300, 200);
        t.setLocation(300, 200);
        t.setVisible(true);
    }

}

------解决方案--------------------
String str=String.valueOf(BOLD);