java设置表格内容居中 javaswing表格

JAVA swing 表格

package swing;

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() { //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 = {

        {"Wang Yi", "Executive", 

        "01068790231", new Integer(5000), new Boolean(false)},

        {"Li Si", "Secretary", 

        "01069785321", new Integer(3500), new Boolean(true)},

        {"Li Wu", "Manager",

        "01065498732", new Integer(4500), new Boolean(false)},

        {"Zhao Liu", "Safeguard",

        "01062796879", new Integer(2000), new Boolean(true)},

        {"Chen Qi", "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(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);

  }

 }