JLabel jl1=null;JTextField jtf=null;JButton jb1,jb2,jb3,jb4;JTable jt=null;JScrollPane jsp=null;//String sql;public static void main(String[] args) { test1 t1=new test1();} test1(){ jp1=new JPanel();jl1=new JLabel("请输入要查询的编号");jtf=new JTextField(10);jb...