有人知道 怎么用jtable显示 表格内数据的合计或者列数吗？像dbgrid中合计行那样的，或者其他的解决方案 100分

Question

可以自已写一个TableModel， 最后一行的值为这一列相加就可以。

Answer 1

那就是每个不同查询结果的显示都要写不同的model了
在java里只有这一种方法吗？？

Answer 2

自己重载public Object getValueAt(int nRow, int nCol)方法了
这个不难的！！

Answer 3

给一段tableModel的例子，你看看吧。public class MyTableModel extends AbstractTableModel {
  private final String[] names = {
          "商品编号","商品名称","规格","单位",
          "数量","单价","总价","备注"
  };
  private final Object[][] data = {  //10row  8column
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""},
          {"","","","","","","",""}
  };  public MyTableModel() {
  }
  public int getRowCount() {
    return data.length;
  }
  public int getColumnCount() {
    return names.length;
  }
  public Object getValueAt(int rowIndex, int columnIndex) {
    return data[rowIndex][columnIndex];
    //throw new java.lang.UnsupportedOperationException("Method getValueAt() not yet implemented.");
  }
  public String getColumnName(int column){
    return names[column];
  }
  public boolean isCellEditable(int row,int col){
    switch (col){
      case 3 : return true;
      case 4 : return true;
      case 5 : return true;
      case 7 : return true;
     default : return false;
    }
  }
  public void setValueAt(Object aValue,int row,int col){
    data[row][col] = aValue;
  }
  public Object[][] getData(){
    return data;
  }
}