java工程编程错误帮忙修改

Question

package com.zong.demo;import java.awt.Color;import java.awt.Container;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;import com.setandget.Renshu;@SuppressWarnings("serial")public class RenshuDemo extends JFrame {    public RenshuDemo() {/* JFrame frame */        // super(frame, "������ѯ", true);        setBounds(450, 250, 550, 500);        setDefaultCloseOperation(EXIT_ON_CLOSE);        final Renshu renshu1 = new Renshu();                // final Renshu renshu3 = new Renshu();        // final Renshu renshu4 = new Renshu();        // final Renshu renshu5 = new Renshu();        // final Renshu renshu6 = new Renshu();        Container con = getContentPane();        con.setBackground(Color.PINK);        setResizable(false);        setLayout(null);        final JCheckBox box1 = new JCheckBox();        final JTextField field1_1 = new JTextField();        final JTextField field1_2 = new JTextField();        field1_1.setBounds(30, 5, 20, 20);        JLabel jLabel1 = new JLabel(":");        jLabel1.setBounds(53, 5, 20, 20);        field1_2.setBounds(60, 5, 20, 20);        field1_1.requestFocus();        box1.setBounds(5, 5, 20, 20);        con.add(box1);        con.add(field1_1);        con.add(jLabel1);        con.add(field1_2);        final Renshu renshu2 = new Renshu();        final JCheckBox box2 = new JCheckBox();        final JTextField field2_1 = new JTextField();        final JTextField field2_2 = new JTextField();        field2_1.setBounds(30, 40, 20, 20);        JLabel jLabel2 = new JLabel(":");        jLabel2.setBounds(53, 40, 20, 20);        field2_2.setBounds(60, 40, 20, 20);        box2.setBounds(5, 40, 20, 20);        con.add(box2);        con.add(field2_1);        con.add(jLabel2);        con.add(field2_2);        final JCheckBox box3 = new JCheckBox();        final JTextField field3_1 = new JTextField();        final JTextField field3_2 = new JTextField();        field3_1.setBounds(30, 75, 20, 20);        JLabel jLabel3 = new JLabel(":");        jLabel3.setBounds(53, 75, 20, 20);        field3_2.setBounds(60, 75, 20, 20);        box3.setBounds(5, 75, 20, 20);        con.add(box3);        con.add(field3_1);        con.add(jLabel3);        con.add(field3_2);        final JCheckBox box4 = new JCheckBox();        final JTextField field4_1 = new JTextField();        final JTextField field4_2 = new JTextField();        field4_1.setBounds(130, 5, 20, 20);        JLabel jLabel4 = new JLabel(":");        jLabel4.setBounds(153, 5, 20, 20);        field4_2.setBounds(160, 5, 20, 20);        field4_1.requestFocus();        box4.setBounds(105, 5, 20, 20);        con.add(box4);        con.add(field4_1);        con.add(jLabel4);        con.add(field4_2);        final JCheckBox box5 = new JCheckBox();        final JTextField field5_1 = new JTextField();        final JTextField field5_2 = new JTextField();        field5_1.setBounds(130, 40, 20, 20);        JLabel jLabel5 = new JLabel(":");        jLabel5.setBounds(153, 40, 20, 20);        field5_2.setBounds(160, 40, 20, 20);        box5.setBounds(105, 40, 20, 20);        con.add(box5);        con.add(field5_1);        con.add(jLabel5);        con.add(field5_2);        //        final JCheckBox box6 = new JCheckBox();        final JTextField field6_1 = new JTextField();        final JTextField field6_2 = new JTextField();        field6_1.setBounds(130, 75, 20, 20);        JLabel jLabel6 = new JLabel(":");        jLabel6.setBounds(153, 75, 20, 20);        field6_2.setBounds(160, 75, 20, 20);        box6.setBounds(105, 75, 20, 20);        con.add(box6);        con.add(field6_1);        con.add(jLabel6);        con.add(field6_2);        JButton queding = new JButton("ȷ��");        queding.setBounds(5, 120, 175, 30);        queding.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                {                    String string = field1_1.getText().toString();                    String string2 = field1_2.getText().toString();                    char a = string.charAt(0);// �п�                    char b = string.charAt(1);// �п�                    char c = string2.charAt(0);// ����                    char d = string2.charAt(1);// ����                    renshu1.setColnum1_1(a);                    renshu1.setColnum2_1(b);                    renshu1.setRownum1_1(c);                    renshu1.setRownum2_1(d);                    System.out.println(renshu1.getColnum1_1() + " "                            + renshu1.getColnum2_1() + " "                            + renshu1.getRownum1_1() + " "                            + renshu1.getRownum2_1());                }                {                    String string = field2_1.getText().toString();                    String string2 = field2_2.getText().toString();                    char a = string.charAt(0);// �п�                    char b = string.charAt(1);// �п�                    char c = string2.charAt(0);// ����                    char d = string2.charAt(1);// ����                    renshu2.setColnum1_2(a);                    renshu2.setColnum2_2(b);                    renshu2.setRownum1_2(c);                    renshu2.setRownum2_2(d);                    System.out.println(renshu2.getColnum1_2() + " "                            + renshu2.getColnum2_2() + " "                            + renshu2.getRownum1_2() + " "                            + renshu2.getRownum2_2());                }            }        });        con.add(queding);    }    public static void main(String[] args) {        RenshuDemo demo = new RenshuDemo();        demo.setVisible(true);    }}