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云代码 - java代码库

java表格 JTable实例 (带滚动条,内嵌选择框)

2013-04-06 作者: 小蜜锋举报

[java]代码库

import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
 
public class JTableDemo extends JFrame {
    private boolean DEBUG = true;
 
    public JTableDemo() { // 实现构造方法
        super("RecorderOfWorkers"); // 首先调用父类JFrame的构造方法生成一个窗口
        MyTableModel myModel = new MyTableModel();// myModel存放表格的数据
        JTable table = new JTable(myModel);// 表格对象table的数据来源是myModel对象
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));// 表格的显示尺寸
 
        // 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() {// 注册窗口监听器
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
 
    // 把要显示在表格中的数据存入字符串数组和Object数组中
    class MyTableModel extends AbstractTableModel {
        // 表格中第一行所要显示的内容存放在字符串数组columnNames中
        final String[] columnNames = { "First Name", "Position", "Telephone",
                "MonthlyPay", "Married" };
        // 表格中各行的内容保存在二维数组data中
        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) } };
 
        // 下述方法是重写AbstractTableModel中的方法,其主要用途是被JTable对象调用,以便在表格中正确的显示出来。程序员必须根据采用的数据类型加以恰当实现。
 
        // 获得列的数目
        public int getColumnCount() {
            return columnNames.length;
        }
 
        // 获得行的数目
        public int getRowCount() {
            return data.length;
        }
 
        // 获得某列的名字,而目前各列的名字保存在字符串数组columnNames中
        public String getColumnName(int col) {
            return columnNames[col];
        }
 
        // 获得某行某列的数据,而数据保存在对象数组data中
        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;
            }
        }
 
        // 改变某个数据的值
        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(JTableDemo.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) {
        JTableDemo frame = new JTableDemo();
        frame.pack();
        frame.setVisible(true);
    }
}

[代码运行效果截图]


java表格 JTable实例 (带滚动条,内嵌选择框)


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