JTable单元格中的数字或字符串等怎样实现居中显示？

Question

从DefaultTableCellRenderer  继承,重写
public Component getTableCellRendererComponent( JTable jTable,
                                                      Object value,
                                                      boolean pSelected,
                                                      boolean pHasFocus,
                                                      int rowIndex,
                                                      int columnIndex ){
    //
}

Answer 1

下面是一个简单的例子，你需要使用jtable.setCellRenderer(TableCellRenderer的实例);来引用下面的类。这里只是简单的例子，你还可以用其他参数完成更加复杂的功能。
public class Render extends JLabel implements TableCellRenderer{
 public Component getTableCellRendererComponent(JTable table, Object value,
                                                 boolean isSelected,
                                                 boolean hasFocus, int row,
                                                 int column) {
    if(value instanceof String)
    {
      this.setHorizontalAlignment(CENTER);
    }
    else if (value instanceof Integer)
    {
      this.setHorizontalAlignment(LEFT);
    }
    return this;
  }
}

Answer 2

没那么麻烦只要继承一下JTable，重载getCellRenderer方法就可以了
getCellRenderer(int x, int y)
{
  TableCellRenderer renderer = super.getCellRenderer();
  if (renderer instanceof JLabel)
{
  ((JLabel)renderer).setHorizontalAlignment(CENTER);
}
}