Question

try {
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

    Connection conn = DriverManager.getConnection("jdbc:odbc:oradsn","mahesh","genius");

    Statement stmt = conn.createStatement();
    ResultSet rs= stmt.executeQuery("select count(*) from std");
    rs.next();
    int maxno= Integer.parseInt(rs.getString(1));
    String[] ColumnNames = {"Roll No","Name","English","Maths","Computer"};
    Object[][] rowdata=new Object[maxno][5]; 
    Statement stmt1 = conn.createStatement();
    ResultSet rs1= stmt1.executeQuery("select * from std");
    int r=0;
    while(rs1.next()) {
        rowdata[r][0]=rs1.getString(1);
        rowdata[r][1]=rs1.getString(2);
        rowdata[r][2]=rs1.getString(3);
        rowdata[r][3]=rs1.getString(4);
        rowdata[r][4]=rs1.getString(5);
        r++;
    }
    JTable table = new JTable(rowdata,ColumnNames);
    jPanel1.add(table.getTableHeader(), BorderLayout.NORTH);
    jPanel1.setLayout(new FlowLayout());
    jPanel1.add(new JScrollPane().add(table));
    this.pack();
}

在此代码中，我希望ColumnNames位于表格之上。但是当我运行程序时，左边有ColumnNames，右边有桌子。我认为问题出在最后5行。请帮忙。

Answer 1

删除

jPanel1.add(table.getTableHeader(), BorderLayout.NORTH);

然后改变

jPanel1.add(new JScrollPane().add(table));

到

jPanel1.add(new JScrollPane(table));

我可能也会改变

jPanel1.setLayout(new FlowLayout());

到

jPanel1.setLayout(new BorderLayout());

还要记住，一个容器有一个布局管理器，如果你改变它，它会影响到之前添加到它的其他组件

我们建议您查看How to use Scroll Panes和How to use tables，因为它们提供了有关如何使用它们的更多信息

columnNames可见表左侧而不是TOP

1 个答案: