各位大神，如何用TableModel实例化JTable？
package myeditmytable;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.table.AbstractTableModel;
class Mytable extends AbstractTableModel{
Object [][] computer={{"CPU","p4赛扬346",540},{"主板","foxconnPM800",564},{"内存","infinen",320},{"硬盘","seagate80G",410},{"液晶显示器","LG",1860},{"光驱","LGDVD",180},{"机箱电源","foxconn",260},{"鼠标键盘","套件",50}};
String []items={"部件","名称","价格"};
public int getRowCount(){
return computer.length;
}
public int getColumnCount(){
return items.length;
}
public boolean isCellEditable(int rowIndex,int columnIndex){
if(columnIndex==1)
return false;
else
return true;
}
public Object getValueAt(int row,int column){
return 0;
}
public void setValueAt(Object aValue,int rowIndex,int columnIndex){
computer[rowIndex][columnIndex]=aValue;
this.fireTableCellUpdated(rowIndex, columnIndex);
}
}
public class EditJTable {
public static void main(String[]args){
final Mytable mytable=new Mytable();
final JTable tab=new JTable(mytable);
JLabel lab1=new JLabel("个人电脑配置",JLabel.CENTER);
JScrollPane scroll=new JScrollPane(tab);
final JLabel lab2=new JLabel("所选部件的价格为：");
JButton pricebtn=new JButton("计算总价格");
JFrame frame=new JFrame();
frame.getContentPane().add(scroll);
JPanel pane=new JPanel();
pane.add(pricebtn);
pane.add(lab2);
frame.add(lab1,BorderLayout.NORTH);
//frame.add(tab,BorderLayout.CENTER);
frame.add(pane,BorderLayout.SOUTH);
frame.setVisible(true);
frame.pack();
pricebtn.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
double price=0.0;
for(int i=0;i<mytable.getRowCount();i++){
price+=Double.parseDouble(mytable.computer[i][2].toString());
}
lab2.setText("所选部件的价格为："+String.valueOf(price));
}
});
}
}
我的这段代码TableModel为什么不能实例化JTable？
各位大神请赐教。
[解决办法]
package test;import javax.swing.*;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;import javax.swing.table.AbstractTableModel;import javax.swing.table.TableColumn;import javax.swing.table.TableModel;import java.awt.*;public class TableModelDemo extends JFrame { private JTable table; public TableModelDemo() { Container container = getContentPane(); addTable(container); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(600, 400); setLocationRelativeTo(null); setVisible(true); } protected void addTable(Container container) { String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian" }; Object[][] rowData = { {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)}, {"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)} }; table = new JTable(new MyTableModel(rowData, columnNames)); table.setFillsViewportHeight(true); container.add(new JScrollPane(table)); // 设置列宽 TableColumn column = null; for (int i = 0; i < columnNames.length; ++i) { column = table.getColumnModel().getColumn(i); if (2 == i) { column.setPreferredWidth(150); } else { column.setPreferredWidth(50); } } table.getSelectionModel().addListSelectionListener(new ListSelectionListener() { @Override public void valueChanged(ListSelectionEvent event) { if (!event.getValueIsAdjusting()) { TableModel model = table.getModel(); int row = table.getSelectedRow(); int column = table.getSelectedColumn(); System.out.println(model.getValueAt(row, column)); } } }); } public static void main(String[] args) { new TableModelDemo(); } protected class MyTableModel extends AbstractTableModel { private String[] columnNames; private Object[][] rowData; public MyTableModel(Object[][] rowData, String[] columnNames) { this.rowData = rowData; this.columnNames = columnNames; } @Override public int getColumnCount() { return columnNames.length; } @Override public int getRowCount() { return rowData.length; } @Override public String getColumnName(int col) { return columnNames[col]; } @Override public Class getColumnClass(int col) { // 如果是boolean，则显示为JCheckBox // 如果是Integer，则只能输入整数 return getValueAt(0, col).getClass(); } @Override public boolean isCellEditable(int row, int col) { // 第一列不能编辑 return col == 0 ? false : true; } @Override public Object getValueAt(int row, int col) { return rowData[row][col]; } @Override public void setValueAt(Object value, int row, int col) { // 双击时cell editor显示，然后输入值 // 当cell失去焦点或者按下回车键后，setValueAt方法被调用，更新cell renderer System.out.println("setValuAt: Value: " + value + ", [" + row + ", " + col + "]"); rowData[row][col] = value; fireTableCellUpdated(row, col); } }}
[解决办法]
那是因为你没有返回：
public Object getValueAt(int row,int column){return 0;}//所以你显示的都是0应该为：public Object getValueAt(int row, int col) { return computer[row][col]; //return 0;}显示表头：必须实现getColumnName();public String getColumnName(int col) { return items[col];}完整代码贴给你：class Mytable extends AbstractTableModel{ Object [][] computer={{"CPU","p4赛扬346",540},{"主板","foxconnPM800",564},{"内存","infinen",320},{"硬盘","seagate80G",410},{"液晶显示器","LG",1860},{"光驱","LGDVD",180},{"机箱电源","foxconn",260},{"鼠标键盘","套件",50}}; String []items={"部件","名称","价格"}; public int getRowCount(){ return computer.length; } public int getColumnCount(){ return items.length; } public boolean isCellEditable(int rowIndex,int columnIndex){ if(columnIndex==1) return false; else return true; } public String getColumnName(int col) {//返回表头内容 return items[col]; } public Object getValueAt(int row, int col) {//返回表格内容 return computer[row][col]; //return 0; } public void setValueAt(Object aValue,int rowIndex,int columnIndex){ computer[rowIndex][columnIndex]=aValue; this.fireTableCellUpdated(rowIndex, columnIndex); } } public class EditJTable { public static void main(String[]args){ final Mytable mytable=new Mytable(); final JTable tab=new JTable(mytable); JLabel lab1=new JLabel("个人电脑配置",JLabel.CENTER); JScrollPane scroll=new JScrollPane(tab); final JLabel lab2=new JLabel("所选部件的价格为："); JButton pricebtn=new JButton("计算总价格"); JFrame frame=new JFrame(); frame.getContentPane().add(scroll); JPanel pane=new JPanel(); pane.add(pricebtn); pane.add(lab2); frame.add(lab1,BorderLayout.NORTH); //frame.add(tab,BorderLayout.CENTER); frame.add(pane,BorderLayout.SOUTH); frame.setVisible(true); frame.pack(); pricebtn.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ double price=0.0; for(int i=0;i<mytable.getRowCount();i++){ price+=Double.parseDouble(mytable.computer[i][2].toString()); } lab2.setText("所选部件的价格为："+String.valueOf(price)); } }); } }