guiuse.java

一个关于表格处理的小程序。java编写。可供初学者学习。

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 GUIUse extends JFrame {

	private boolean DEBUG = true;

	public GUIUse() {
		//首先调用父类JFrame的构造方法生成一个窗口
		super("Phone"); 

		//生成表格数据对象myModel
		MyTableModel myModel = new MyTableModel();
		//生成表格对象table，并将其数据来源关联为myModel
		JTable table = new JTable(myModel);
		//设置表格的显示尺寸
		table.setPreferredScrollableViewportSize(new Dimension(400, 200));

		//生成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);
		//生成事件监听器
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}


	//MyTableModel类，用于存放表格数据
	class MyTableModel extends AbstractTableModel {

		//表格中第一行的内容保存在字符串数组columnNames中
		final String[] columnNames = {"First Name","Sex","Telephone"};
		//其余各行的内容保存在二维数组data中
		final Object[][] data = {{"Wenjian", "male","0105521534"},
					{"zyiyi", "female","0105548762"},
					{"Xiaoxia", "female","01055687142"},
					{"Lala", "male","0103656965"},
					{"Wangyong", "male","0105846925"},
					{"Guanyuan", "female","0106685932"},
					{"Liusong", "male","0105569865"},
					{"Shenghao", "male","01013696596"},
					{"Sasa", "female","0105565452"},
					{"Bobo", "female","01012345678"},
					{"Tuding", "male","01098745632"},
					{"ChenLei", "male","01025896336"}};

		/*重载AbstractTableModel中的方法，以便为JTable对象所调用。
		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，必须重载
		public int getColumnCount() {
			return columnNames.length;
		}

		//获得行的数目，必须重载
		public int getRowCount() {
			return data.length;
		}

		//获得某列的名字，必须重载
		public String getColumnName(int col) {
			return columnNames[col];
		}

		//获得某行某列的数据，必须重载
		public Object getValueAt(int row, int col) {
			return data[row][col];
		}

		//判断每个单元格的类型，根据需要进行重载
		public Class getColumnClass(int c) {
			return getValueAt(0, c).getClass();
		}

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

		//改变某个数据的值，根据需要进行重载
		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(GUIUse.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();
			}
		}

		//打印数据，必须重载
		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) {
		GUIUse frame = new GUIUse();
		frame.pack();
		frame.setVisible(true);
	}
}