界面运行出来后l1.setHorizontalTextPosition(SwingConstants.LEFT );l1.setVerticalTextPosition(SwingConstants.BOTTOM);没效果啊！import java.awt.*;import javax.swing.*;public class LabelTest {JFrame f=new JFrame("Test");Container cp=f.getContentPane();JLabel l1;/** * @param args */public static void main(String[] args) {// TODO 自动生成方法存根 LabelTest that=new LabelTest(); that.go();}void go(){l1=new JLabel("This is a label");l1.setToolTipText("Label1"); l1.setHorizontalTextPosition(SwingConstants.LEFT ); l1.setVerticalTextPosition(SwingConstants.BOTTOM);cp.add(l1);f.setVisible(true);f.pack();}}