ADD file via upload

CartTableModel.java

@@ -0,0 +1,74 @@
+package com.mbz.ui;
+
+import javax.swing.table.AbstractTableModel;
+
+public class CartTableModel extends AbstractTableModel{
+
+	//表格列表名columnNames
+    private  String[] columnNames = {"商品编号","商品名","商品单价","数量","商品应付金额"};
+
+    //表格中数据保存在data二维数组中
+    private  Object[][] data = null;
+
+    public CartTableModel(Object [][] data) {
+        this.data = data;
+    }
+
+    //返回列数
+    @Override
+    public int getColumnCount() {
+        return columnNames.length;
+    }
+
+    //返回行数
+    @Override
+    public int getRowCount() {
+        return data.length;
+    }
+
+
+    //获得某行某列的数据，而数据保存在对象数组data中
+    @Override
+    public Object getValueAt(int rowIndex, int columnIndex) {
+        return data[rowIndex][columnIndex];
+    }
+
+    @Override
+    public String getColumnName(int columnIndex){
+        return columnNames[columnIndex];
+    }
+
+    @Override
+    public  boolean isCellEditable(int rowIndex, int columnIndex) {
+        //数量列可以修改
+        if(columnIndex == 3){
+            return true;
+        }
+        return false;
+    }
+    @Override
+    public  void setValueAt(Object aValue, int rowIndex, int columnIndex) {
+        //只允许修改数量列
+        if(columnIndex != 3){
+            return;
+        }
+        try{
+            //从表中获得修改之后的商品数量，从表而来的数据都String类型
+            int quantity = new Integer((String) aValue);
+            //商品数量不能小于0
+            if(quantity < 0){
+                return;
+            }
+            //更新数量列
+            data[rowIndex][3] = quantity;
+            //计算商品应付金额
+            double unitcost = (double) data[rowIndex][2];
+            double totalPrice = unitcost * quantity;
+            //更新商品应付金额列
+            data[rowIndex][4] = new Double(totalPrice);
+        }catch(Exception e){
+
+        }
+    }
+}
+