Question

当我运行以下代码时，出现错误：

java.lang.String无法强制转换为java.lang.Integer

这是我的代码：

try{
       int rows = jTable1.getRowCount();
       String myUrl = "jdbc:mySql://localhost:3306/hospital"; 
       Connection con = DriverManager.getConnection(myUrl,"root","");
       con.setAutoCommit(false);


            String query = "Insert into `test and treatment_has_admission`(`Test and Treatment_id`,`Admission_a_id`,`Test_Result`,`Treatment_Result`,`Date`)"+" values (?, ?, ?, ?, ?)";
            PreparedStatement pst = con.prepareStatement(query);
            for(int row=0; row<rows; row++){
                int TestTreatmentID = (int) jTable1.getValueAt(row, 1);
                String test_result = (String) jTable1.getValueAt(row, 2);
                String treatment_result = (String) jTable1.getValueAt(row, 3);
                String Date = (String) jTable1.getValueAt(row, 4);
                pst.setInt(1,TestTreatmentID);
                pst.setInt(2,Integer.parseInt(t2.getText()));
                pst.setString(3, test_result);
                pst.setString(4, treatment_result);
                pst.setString(5, Date);

                pst.addBatch();
            }
            pst.executeBatch();
            con.commit();
            con.close();
        }


    catch(Exception e){
        e.printStackTrace();
    }



}

错误：java.lang.ClassCastException：java.lang.String不能强制转换为java.lang.Integer

为什么我收到这样的错误？请帮我解决一下。

Answer 1

String无法转换为Integer。使用此

 int TestTreatmentID = Integer.parseInt(jTable1.getValueAt(row, 1));

修改

String string= jTable1.getValueAt(row, 1).toString(); int TestTreatmentID = Integer.parseInt(string);

Answer 2

看来你在线上遇到了问题

int TestTreatmentID = (int) jTable1.getValueAt(row, 1);

让我们使用Integer.parseInt代替

Integer TestTreatmentID = Integer.parseInt(jTable1.getValueAt(row, 1).toString());

Answer 3

你不能简单地对这样的整数进行类型转换

int TestTreatmentID = (int) jTable1.getValueAt(row, 1);

相反，解析此字符串以获取正确的整数值

int TestTreatmentID = Integer.parseInt(jTable1.getValueAt(row, 1));

Answer 4

您需要使用

将从方法返回的值解析为Int

Integer.parseInt(jTable1.getValueAt(row, 1));

Java错误：'java.lang.String无法强制转换为java.lang.Integer'

4 个答案: