Question

java这个查询条件那个框也和一条线一样的怎么来的 中间还放了4个组件

Answer 1

组件放到JPanel里。JPanel设置边框：

panel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.BLACK),
                                                                "查询条件",
                                                                TitledBorder.LEADING,
                                                                TitledBorder.TOP));

Answer 2

那是一个panle...