我试图使用DefaultTableModel将数据动态地添加到JTable中,但是它不起作用。
我创建了两个类:一个类(Input.java)代表一个弹出窗口,该弹出窗口允许您写入数据(名称,选项和约束)并保存。另一个类表示一个包含表(InputMain.java)的弹出窗口。然后,InputMain将这些信息(如果收到)转换为表中的一行,并在三列中列出所有这些信息。在Input中,我创建了InputMain的实例,并将表的模型设置为新的DefaultTableModel()(如果不这样做,它将引发错误)(在InputMain中已经创建了表,因此如果我创建了InputMain的实例,可能是在InputMain中调用了该表。然后,根据actionPerformed(ActionEvent e),在JPanel中单击“输入”按钮后,它将创建一个具有nameText,optionText和约束Text的新数据数组。最后,数据将添加到模型中。
我不知道为什么不能将所有这些数据添加到表中,除了上面的方法对我来说听起来很合逻辑。
这是InputMain.java类:
package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* Created by paull on 14/5/2016.
*/
public class InputMain {
JButton add;
JButton change;
JButton delete;
JTable table;
String[] columns;
String[][] data;
JButton create;
JPanel labelPanel;
JPanel bigPanel;
JPanel centerPanel;
public InputMain() {
int fontSize = 50;
add = new JButton("add");
change = new JButton("change");
delete = new JButton("delete");
create = new JButton("create");
columns = new String[]{"name","option","constraint"};
data = new String[][]{{"","",""}};
table = new JTable(data,columns) {
@Override
public boolean isCellEditable(int row, int column) {
return false; //to avoid it from being changable by double clicking any data
}
};
table.setPreferredScrollableViewportSize(new Dimension(450,63));
table.setFillsViewportHeight(true);
JScrollPane jsp = new JScrollPane(table); // not always can the table be fully shown --> add a scrollbar
add.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
change.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
delete.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
create.setFont(new Font(add.getName(),Font.PLAIN,fontSize));
table.setFont(new Font(table.getName(),Font.PLAIN,fontSize));
//table.getEditorComponent().setFont(new Font(add.getName(),Font.PLAIN,fontSize));
table.getTableHeader().setFont(new Font(table.getName(),Font.PLAIN,fontSize));
labelPanel = new JPanel();
labelPanel.add(add);
labelPanel.add(change);
labelPanel.add(delete);
labelPanel.setLayout(new FlowLayout(10,30,10));
centerPanel = new JPanel();
centerPanel.add(labelPanel);
centerPanel.setLayout(new GridBagLayout());
bigPanel = new JPanel();
bigPanel.setLayout(new GridLayout(3,0));
bigPanel.add(centerPanel);
bigPanel.add(jsp);
bigPanel.add(create);
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
Input i = new Input();
s.add(i.labelPanel);
s.setVisible(true);
}
}); // pressing add button pops up the Input Frame
}
}
这是Input.java类:
package com.company;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* Created by paull on 14/5/2016.
*/
public class Input extends JPanel{
JLabel nameLabel;
JLabel optionLabel;
JLabel constraintLabel;
JButton enter;
JPanel labelPanel;
JPanel jp2;
JPanel jp3;
JPanel jp4;
JTextField nameText;
String[] optionStrings;
JComboBox<String> optionText;
JCheckBox wk1;
JCheckBox wk2;
JCheckBox wk3;
JCheckBox wk4;
JCheckBox wk5;
public Input() {
nameLabel = new JLabel("name: ");
optionLabel = new JLabel("option: ");
constraintLabel = new JLabel("constraint:");
enter = new JButton("add");
nameText = new JTextField(10);
Options c = new Options();
optionStrings = new String[]{c.satNight,c.sunEight,c.sunNineThirty,c.sunEleven,c.sunNight};
optionText = new JComboBox<String>(optionStrings);
wk1 = new JCheckBox("1");
wk2 = new JCheckBox("2");
wk3 = new JCheckBox("3");
wk4 = new JCheckBox("4");
wk5 = new JCheckBox("5");
int fontSize = 50;
nameLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
optionLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
constraintLabel.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
enter.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
nameText.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
optionText.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk1.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk2.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk3.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk4.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
wk5.setFont(new Font(nameLabel.getName(),Font.PLAIN,fontSize));
labelPanel = new JPanel();
labelPanel.add(nameLabel);
labelPanel.add(nameText);
labelPanel.add(optionLabel);
labelPanel.add(optionText);
labelPanel.add(constraintLabel);
labelPanel.add(wk1);
labelPanel.add(wk2);
labelPanel.add(wk3);
labelPanel.add(wk4);
labelPanel.add(wk5);
labelPanel.add(enter);
labelPanel.setLayout(new FlowLayout(10,30,10));
InputMain i = new InputMain();
i.table.setModel(new DefaultTableModel());
DefaultTableModel model = (DefaultTableModel) i.table.getModel();
enter.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String constraintText = "";
String[] data = new String[]{nameText.getText(),optionText.getSelectedItem().toString(),constraintText};
model.addRow(data);
nameText.setText("");
}
});
}
}
提前致谢。
最佳答案
我认为问题出在InputMain的actionPerformed上。
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
Input i = new Input();
s.add(i.labelPanel);
s.setVisible(true);
}
});
您构造
Input
的新实例。这意味着您每次单击添加按钮时都会创建一个新的空DefaultTableModel并将其附加到表中。尝试将输入的构造移到actionPerformed之外: Input i = new Input();
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
InputFrame s = new InputFrame();
s.add(i.labelPanel);
s.setVisible(true);
}
更新
当然,Input内部的InputMain实例化也应该删除。而是在Input中具有TypeInputMain类型的成员:
private InputMain inputMain;
并更改Input的构造函数以设置值:
public Input (InputMain inputMain) {
this.inputMain = inputMain;
...
并将InputMain中Input的实例化为
Input i = new Input(this);