show()过时了怎么办？

Question

大家帮忙看下,下面这个简单程序,问题是show()用不了怎么办.
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.FlowLayout;
import javax.swing.ImageIcon;
class ShowJButton extends JFrame{
            JButton jbutton1=new JButton("上一笔");//文字按钮
            ImageIcon imageIcon1=new ImageIcon("f:\\code\\image\\ace.jpg");
            JButton jbutton2=new JButton("下一笔",imageIcon1);//文字图形按钮
            ImageIcon imageIcon2=new ImageIcon("f:\\code\\image\\ace.jpg");
            JButton jbutton3=new JButton(imageIcon2); //图形按钮
            FlowLayout flowLayout1=new FlowLayout();
            ShowJButton(){
                setTitle("按钮演示窗口");
                setSize(200,150);
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                jbutton3.setToolTipText("退出程序"); //设置按钮3的提示文字
                this.getContentPane().setLayout(flowLayout1);
                this.getContentPane().add(jbutton1);
                this.getContentPane().add(jbutton2);
                this.getContentPane().add(jbutton3);
                show();
              }
      public static void main(String[] args){
             ShowJButton sjb=new ShowJButton();
    }}