tabledemo.java

来自「java的书上例子」· Java 代码 · 共 131 行

//例13.3 RecorderOfWorkers
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;

public class TableDemo extends JFrame {
    private boolean DEBUG = true;
    public TableDemo() {
        super("RecorderOfWorkers");
        MyTableModel myModel = new MyTableModel();
        JTable table = new JTable(myModel);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        //产生一个带滚动条的面板 
        JScrollPane scrollPane = new JScrollPane(table);

        //将带滚动条的面板添加入窗口中
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
		//将要写入的数据存入字符串数组和Object数组中
    class MyTableModel extends AbstractTableModel {
        final String[] columnNames = {"First Name", 
                                      "Position",
                                      "Telephone",
                                      "MonthlyPay",
                                      "Married"};
        final Object[][] data = {
            {"Wangdong", "Executive", 
             "01068790231", new Integer(5000), new Boolean(false)},
            {"LiHong", "Secretary", 
             "01069785321", new Integer(3500), new Boolean(true)},
            {"LiRui", "Manager",
             "01065498732", new Integer(4500), new Boolean(false)},
            {"ZhaoXin", "Safeguard",
             "01062796879", new Integer(2000), new Boolean(true)},
            {"ChenLei", "Salesman",
             "01063541298", new Integer(4000), new Boolean(false)}
        };

        public int getColumnCount() {
            return columnNames.length;
        }
        public int getRowCount() {
            return data.length;
        }

        public String getColumnName(int col) {
            return columnNames[col];
        }

        public Object getValueAt(int row, int col) {
            return data[row][col];
        }

        //判断每个单元格的类型
        public Class getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }

        //将表格声明为可编辑的
        public boolean isCellEditable(int row, int col) {
            
            if (col < 2) { 
                return false;
            } else {
                return true;
            }
        }

        public void setValueAt(Object value, int row, int col) {
            if (DEBUG) {
                System.out.println("Setting value at " + row + "," + col
                                   + " to " + value
                                   + " (an instance of " 
                                   + value.getClass() + ")");
            }

            if (data[0][col] instanceof Integer                        
                    && !(value instanceof Integer)) {                  
                try {
                    data[row][col] = new Integer(value.toString());
                    fireTableCellUpdated(row, col);
                } catch (NumberFormatException e) {
                    JOptionPane.showMessageDialog(TableDemo.this,
                        "The \"" + getColumnName(col)
                        + "\" column accepts only integer values.");
                }
            } else {
                data[row][col] = value;
                fireTableCellUpdated(row, col);
            }

            if (DEBUG) {
                System.out.println("New value of data:");
                printDebugData();
            }
        }

        private void printDebugData() {
            int numRows = getRowCount();
            int numCols = getColumnCount();

            for (int i=0; i < numRows; i++) {
                System.out.print("    row " + i + ":");
                for (int j=0; j < numCols; j++) {
                    System.out.print("  " + data[i][j]);
                }
                System.out.println();
            }
            System.out.println("--------------------------");
        }
    }

    public static void main(String[] args) {
        TableDemo frame = new TableDemo();
        frame.pack();
        frame.setVisible(true);
    }
}