Java JTable构造函数的替代方案
在花了无数个小时使用Swing并尽力学习之后,我遇到了这个问题。在讨论确切的问题之前,我想简要介绍一下情况。如果您立即注意到该问题,请随时跳过此部分 在过去的3天里,我一直在使用JTables(或者至少在尝试)。我对JTable构造函数有几个问题:Java JTable构造函数的替代方案,java,swing,jtable,Java,Swing,Jtable,在花了无数个小时使用Swing并尽力学习之后,我遇到了这个问题。在讨论确切的问题之前,我想简要介绍一下情况。如果您立即注意到该问题,请随时跳过此部分 在过去的3天里,我一直在使用JTables(或者至少在尝试)。我对JTable构造函数有几个问题: JTable(Object[][] rowData, Object[] columnNames) 在反复阅读之后,我偶然发现了一组关于JTable构造函数的观点(使用它的缺点): 它们会自动使每个单元格都可编辑 它们将所有数据类型视为相同的(字符
JTable(Object[][] rowData, Object[] columnNames)
在反复阅读之后,我偶然发现了一组关于JTable构造函数的观点(使用它的缺点):
- 它们会自动使每个单元格都可编辑
- 它们将所有数据类型视为相同的(字符串)。例如,如果表列具有布尔数据,则该表可以在复选框中显示数据。但是,如果使用前面列出的两个JTable构造函数中的任何一个,则布尔数据将显示为字符串。您可以在上图的素食列中看到这一差异
- 它们要求您将表的所有数据放在一个数组或向量中,这可能不适合某些数据。例如,如果要从数据库实例化一组对象,可能需要直接查询对象的值,而不是将其所有值复制到数组或向量中
第一点和第三点都给了我一些问题,所以我想问几个问题:
JTable代码:
整个JFrame类:
import javax.swing.*;
导入javax.swing.border.EmptyBorder;
导入javax.swing.table.TableModel;
导入java.awt.*;
公共类JDatabaseMainFrame扩展了JFrame{
私立JTable studentsJTable;
私有JPanel内容窗格;
公共JDatabaseMainFrame(){
JFrame=newjframe(“JDatabase”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle(“JDatabase”);
可设置大小(真);
设置最小尺寸(新尺寸(850350));
contentPane=newjpanel();
setboorder(新的EmptyBorder(5,5,5,5));
setContentPane(contentPane);
setLayout(新的CardLayout(0,0));
//添加选项卡
JTabbedPane tabbedPane=新的JTabbedPane(JTabbedPane.LEFT);
添加(选项卡窗格,“选项卡”);
//添加学生面板
JPanel studentsPanel=新的JPanel();
tabbedPane.addTab(“学生”,null,studentsPanel,null);
studentsPanel.setLayout(新边界布局(0,0));
//将JTable添加到学生面板
JTable studentsJTable=addStudentsJTable();
添加(studentsJTable,BorderLayout.CENTER);
//添加教师面板
JPanel teachersPanel=新的JPanel();
tabbedPane.addTab(“教师”,null,教师面板,null);
//添加Outing的面板
JPanel outingsPanel=newjpanel();
addTab(“Outings”,null,outingsPanel,null);
挫折(200650650);
包装();
setVisible(真);
}
私有void打印数据(JTable JTable){
int numberOfRows=jTable.getRowCount();
int numberOfColumns=jTable.getColumnCount();
TableModel model=jTable.getModel();
for(int i=0;i
请随意编译以查看当前结果 您应该设置一个自定义TableModel,这样您就可以使用您想要的任何数据结构而不是数组: 这还允许您指定哪些单元格是可编辑的 只需在TableColumn类中调用适当的方法,就可以设置JTable列的宽度。更多信息请点击此处: JTable头只有在JScrollPane中才会自动显示。您确实将JTable添加到JScrollPane中,但随后您不会对该JScrollPane执行任何操作。JScrollPane本身必须位于JFrame中的某个位置
private JTable addStudentsJTable(){
String[] columnNames = {
"Teacher ID",
"Student ID",
"Name",
"Surname",
"E-mail",
"Date of Birth",
"Telephone",
"Course",
"OOP",
"Year of Membership",
"Consent"};
Object[][] data = {
{1, 1, "Random", "Student", "Student@email.com", "1/1/1970", 9999999, "MC", true, 2014, true},
{2, 2, "Student", "Surname", "RandomStudent@email.com", "1/1/1970", 11111111, "AIO", true, 2000, true}
};
studentsJTable = new JTable(data, columnNames);
studentsJTable.setPreferredScrollableViewportSize(new Dimension(850,200));
studentsJTable.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(studentsJTable);
add(scrollPane);
return studentsJTable;
}
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.table.TableModel;
import java.awt.*;
public class JDatabaseMainFrame extends JFrame {
private JTable studentsJTable;
private JPanel contentPane;
public JDatabaseMainFrame(){
JFrame frame = new JFrame("JDatabase");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("JDatabase");
setResizable(true);
setMinimumSize(new Dimension(850,350));
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new CardLayout(0, 0));
//Adding tabs
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.LEFT);
contentPane.add(tabbedPane, "Tabs");
//Adding Student's panel
JPanel studentsPanel = new JPanel();
tabbedPane.addTab("Students", null, studentsPanel, null);
studentsPanel.setLayout(new BorderLayout(0, 0));
//Adding JTable to Student's panel
JTable studentsJTable = addStudentsJTable();
studentsPanel.add(studentsJTable, BorderLayout.CENTER);
//Adding Teacher's panel
JPanel teachersPanel = new JPanel();
tabbedPane.addTab("Teachers", null, teachersPanel, null);
//Adding Outing's panel
JPanel outingsPanel = new JPanel();
tabbedPane.addTab("Outings", null, outingsPanel, null);
setBounds(200,200,650,650);
pack();
setVisible(true);
}
private void printData(JTable jTable){
int numberOfRows = jTable.getRowCount();
int numberOfColumns = jTable.getColumnCount();
TableModel model = jTable.getModel();
for(int i = 0; i < numberOfRows; i++){
System.out.println("Row: " + i + ":");
for(int j = 0; j < numberOfColumns; j++){
System.out.println(" " + model.getValueAt(i, j));
}
System.out.println();
}
System.out.println("-------------------------------");
}
private JTable addStudentsJTable(){
String[] columnNames = {
"Teacher ID",
"Student ID",
"Name",
"Surname",
"E-mail",
"Date of Birth",
"Telephone",
"Course",
"OOP",
"Year of Membership",
"Consent"};
Object[][] data = {
{1, 1, "Random", "Student", "Student@email.com", "1/1/1970", 9999999, "MC", true, 2014, true},
{2, 2, "Student", "Surname", "RandomStudent@email.com", "1/1/1970", 11111111, "AIO", true, 2000, true}
};
studentsJTable = new JTable(data, columnNames);
studentsJTable.setPreferredScrollableViewportSize(new Dimension(850,200));
studentsJTable.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(studentsJTable);
add(scrollPane);
return studentsJTable;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JDatabaseMainFrame frame = new JDatabaseMainFrame();
frame.setVisible(true);
}
});
}
}