import java.sql.Connection;    import java.sql.DriverManager;    import java.sql.PreparedStatement;    import java.sql.ResultSet;    import java.util.ArrayList;        import junit.framework.TestCase;        import org.junit.After;    import org.junit.Before;    import org.junit.Test;        public class TableVoHelper extends TestCase {            @Test        public void testOp() throws Exception {            pstmt = con.prepareStatement("delete from tableB");            pstmt.execute();            pstmt = con.prepareStatement("select * from tableA  ");            rs = pstmt.executeQuery();            ArrayList<TableVo> tVoList = new ArrayList<TableVo>();            while (rs.next()) {                TableVo tVo = new TableVo();                tVo.setId(rs.getInt(1));                tVoList.add(tVo);            }                pstmt = con.prepareStatement("insert into tableB(id)values (?)");            for (TableVo tVo : tVoList) {                pstmt.setInt(1, tVo.getId());                pstmt.execute();            }            }            @Before        public void setUp() throws Exception {            String CLASSNAME = "com.mysql.jdbc.Driver";            String URL = "jdbc:mysql://localhost:3306/fiona";            String UNAME = "root";            String PWD = "root";            Class.forName(CLASSNAME);            con = DriverManager.getConnection(URL, UNAME, PWD);        }            @After        public void tearDown() throws Exception {            if (rs != null) {                rs.close();            }            if (pstmt != null) {                pstmt.close();            }            if (con != null) {                con.close();            }        }            Connection con = null;        PreparedStatement pstmt = null;        ResultSet rs = null;            class TableVo {            public int getId() {                return id;            }                public void setId(int id) {                this.id = id;            }                private int id;        }    }