我刚刚在2个月前开始使用Java，所以我在使用FILE I / O时不够好。我是Stackoverflow的新手，这是我的第一篇文章，希望有人能帮我解决问题。顺便说一句，我正在创建一个可以使用JOptionPane.showInputDialog在文本文件中“写”，“删除”项目，价格等的清单系统，并且还可以允许用户“搜索”所选项目并显示JOptionPane.showMessageDialog中的适当输出。到目前为止，我完成了在文本文件中编写项目和其他信息。我现在的问题是更新价格，删除和搜索它。
这是示例输入和输出：
//sample data in text file
ITEM NAME: PAPER
QUANTITY: 15
ORIGINAL PRICE: P10.00
SRP PRICE: P11.00
ITEM NAME: BALLPEN
QUANTITY: 20
ORIGINAL PRICE: P15.00
SRP PRICE: P16.00
//DELETE and SEARCH sample input and output:
IF USER WANT TO DELETE
Example:
ITEM YOU WANT TO DELETE: PAPER
//all information of Item paper in the text file will be deleted
IF USER WANT TO SEARCH
Example:
ITEM YOU WANT TO SEARCH: BALLPEN
Output In JOptionPane:
ITEM NAME: BALLPEN
//the quantity, original and srp price will be displayed
提前致谢： - ）
这是我在文本文件中写入数据的代码 公共类DataInventory {
public void AddNewItem (String itemName, String qntity, String costPrice, String sellPrice) throws IOException{
BufferedWriter writeOnFile = new BufferedWriter(new FileWriter(new File(
"Storage.txt"), true));
double cnvrtCostPrice = Double.parseDouble(costPrice);
double cnvrtSellPrice = Double.parseDouble(sellPrice);
for (int i = 0; i < invStorage.length; i++){
if (invStorage[i] == null){
invStorage[i] = itemName;
JOptionPane.showMessageDialog(null, qntity + " " + itemName.toUpperCase()
+ " SUCCESSFULLY ADDED TO INVENTORY","Done", JOptionPane.PLAIN_MESSAGE);
writeOnFile.write("ITEM NAME: " + itemName.toUpperCase() + "\n");
writeOnFile.write("QUANTITY: " + qntity + "\n");
writeOnFile.write("ORIGINAL PRICE: P" + String.format("%.2f", cnvrtCostPrice) + "\n");
writeOnFile.write("SRP PRICE: P" + String.format("%.2f", cnvrtSellPrice) + "\n\n");
writeOnFile.write("___________________________________________\n\n");
writeOnFile.close();
return;
}
}
}
private static String invStorage[] = new String [1000];
}