为什么在try处提示illegal start of type,怎么回事？

Question

这里不用try怎么捕获读取数据库的异常呢？

Answer 1

像下面这么写显示是true或false,而不是钩package fee7;import java.awt.*;
import javax.swing.JFrame;
import com.borland.jbcl.layout.*;
import java.awt.event.*;
import opendb.opendb;
import java.sql.*;
import javax.swing.*;public class importData extends JFrame {
  private XYLayout xYLayout1 = new XYLayout();
  private Button button2 = new Button();
  private Button button1 = new Button();
  private Button button3 = new Button();
  private JTable jTable1 = new JTable();
  private JScrollPane jScrollPane1 = new JScrollPane(jTable1);  public importData(final JFrame mainFrame) {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }    mainFrame.setEnabled(false);
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    void button2_actionPerformed(ActionEvent e) {
      mainFrame.setEnabled(true);
      importData.this.dispose();
    }});
  }
  private void jbInit() throws Exception {
    this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
    this.setResizable(false);
    this.setTitle("导入数据");
    this.setSize(new Dimension(600, 400));
    java.awt.Dimension d = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
    this.setLocation((d.width - this.getSize().width) / 2,
                       (d.height - this.getSize().height) / 2 );
      // the above is sure for middle showing
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button1.setLabel("导入");
    button1.setFont(new java.awt.Font("Dialog", 0, 14));
    button2.setFont(new java.awt.Font("Dialog", 0, 14));
    button2.setLabel("取消");    this.getContentPane().setLayout(xYLayout1);
    button3.setFont(new java.awt.Font("Dialog", 0, 14));
    button3.setLabel("显示未导数据");
    button3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button3_actionPerformed(e);
      }
    });
    this.getContentPane().add(button1, new XYConstraints(185, 315, 76, 32));
    this.getContentPane().add(button2,  new XYConstraints(338, 316, 76, 32));
    this.getContentPane().add(button3, new XYConstraints(242, 28, 122, 32));
  }
  //***********page变量**********
  opendb imData=new opendb();
  Object[][] data=new Object[20][8];
  //****************************
  void button1_actionPerformed(ActionEvent e) {  }
  void button3_actionPerformed(ActionEvent e) {
    String sqlblock="select * from block where blockname!='null'";
         try
          {
            ResultSet rs;
            rs=imData.dbstatement.executeQuery(sqlblock);
         }catch(Exception error){error.printStackTrace();}            //************显示表格**************
                   try
                     {
                   String block="select blockname,buildingNumber,buildingNumberReal,wholeArea,wholeAreaReal,wholePrice,wholePriceReal from block where blockname!='null'";
                   ResultSet rs1=imData.dbstatement.executeQuery(block);
                   String[] columnNames={"小区名称","应收楼数","实收楼数","应收总面积","实收总面积","应收总金额","实收总金额","状态"};
                   rs1.last();
                   int a=rs1.getRow();
                   data = new Object[a][8];
                   rs1.beforeFirst();
                   int i=0;
                   while(rs1.next())
                          {
                                  for(int col=1; col<=7; col++)//取列值
                                          data[i][col-1] = rs1.getString(col);
                                  data[i][7]=new Boolean(false);
                                  i++;
                                  data[0][7].getClass();
                          }
                   jTable1=new JTable(data,columnNames);
                   jTable1.setEnabled(false);
                   jTable1.getTableHeader( ).setReorderingAllowed( false );
                   this.getContentPane().add(jScrollPane1,  new XYConstraints(47, 88, 500, 200));
                   jScrollPane1.getViewport().add(jTable1, null);
                   this.show();
                   rs1.close();
                   }catch(Exception ar){ar.printStackTrace();}
            //*******************************
  }
  public Object getValueAt(int row, int col) {
       return data[row][col];
   }  public Class getColumnClass(int c) {
       return getValueAt(0, c).getClass();
  }}