界面插件显示不出来

Question

package Interface;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JPasswordField;import javax.swing.JTextField;//import com.lhl.score.GUI.login.loginEvent;public class login extends JFrame { private JPanel pane1; private JLabel usernameJL; private JLabel paswordJL; private JButton enter; private JButton cancel; JTextField usernameJT; JPasswordField passworkJT; public login(){ getContentPane().setLayout(null); setTitle("运动会管理系统"); pane1=new JPanel(); enter=new JButton("登录"); enter.addActionListener(null); cancel=new JButton("取消"); cancel.addActionListener(null); usernameJL=new JLabel("用户名"); usernameJT=new JTextField(20); paswordJL=new JLabel("密码"); passworkJT=new JPasswordField("20"); pane1.setLayout(null); enter.setBounds(50, 170, 25, 20); cancel.setBounds(50, 170, 25, 20); usernameJL.setBounds(20, 20, 30, 20); paswordJL.setBounds(20, 60, 30, 20); usernameJT.setBounds(60, 100, 70, 20); passworkJT.setBounds(60, 140, 70, 20); pane1.add(enter); pane1.add(cancel); pane1.add(usernameJL); pane1.add(paswordJL); pane1.add(usernameJT); pane1.add(passworkJT); setBounds(100, 100, 200, 160); getContentPane().add(pane1); validate(); setVisible(true); } public static void main(String[] args){ login login1=new login();  }}