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import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; public class DB extends JFrame { static Hashtable idTable; static int idNum=1; private JLabel jLabel1 = new JLabel("ID"); private JLabel jLabel2 ; private JTextField jTextField1 = new JTextField(8); private JTextArea jTextField5 = new JTextArea(); private JButton jButton1; private JButton jButton2; public DB() ..