public void FitTableColumns(JTable myTable){   JTableHeader header = myTable.getTableHeader();      int rowCount = myTable.getRowCount();      Enumeration columns = myTable.getColumnModel().getColumns();      while(columns.hasMoreElements()){          TableColumn column = (TableColumn)columns.nextElement();          int col = header.getColumnModel().getColumnIndex(column.getIdentifier());          int width = (int)myTable.getTableHeader().getDefaultRenderer()                  .getTableCellRendererComponent(myTable, column.getIdentifier()                          , false, false, -1, col).getPreferredSize().getWidth();          for(int row = 0; row<rowCount; row++){              int preferedWidth = (int)myTable.getCellRenderer(row, col).getTableCellRendererComponent(myTable,                myTable.getValueAt(row, col), false, false, row, col).getPreferredSize().getWidth();              width = Math.max(width, preferedWidth);          }          header.setResizingColumn(column); // 此行很重要          column.setWidth(width+myTable.getIntercellSpacing().width);      }