Question

我正在学习超类，抽象类和抽象类，所以我必须从文件中读取一个单词并依赖于我找到的单词，让我的程序运行三种不同的方法之一。但是，我总是遇到这个例外：

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - incompatible types: int cannot be converted to java.lang.String
    at encryption.EncryptorFactory.create(EncryptorFactory.java:23)
    at superencryptor.SuperEncryptor.main(SuperEncryptor.java:15)
C:\Users\Linda\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53:

这是我试图运行该程序的主要包：

package superencryptor;

import encryption.EncryptorFactory;
import encryption.*;

public class SuperEncryptor
{
    public static void main(String[] args)
    {
        String strTestData = "This is a test";
        /* V3 - using a factory */
        EncryptorFactory obFactory = new EncryptorFactory();
        IEncryptor obEncryptor = obFactory.create();

        String strOutEnc = obEncryptor.encrypt(strTestData);
        System.out.println("The encrypted value is: " + strOutEnc);
        String strOutDec = obEncryptor.decrypt(strOutEnc);
        System.out.println("The decrypted value is: " + strOutDec);
    }
}

以下是我尝试运行的方法：

package encryptor;

public class BasicEncryptor implements IEncryptor
{
    @Override
    public String encrypt(String strData)  // "abc"
    {
        String strEncrypted = "";

        for (int nIndex = 0; nIndex < strData.length(); ++nIndex)
        {
            strEncrypted += strData.charAt(nIndex);  
            strEncrypted += "@";
        }

        return strEncrypted;
    }

    @Override
    public String decrypt(String strData) // "a@b@c@"
    {
        String strDecrypted = "";

        // Start at the first character (index = 0) and add 2 to it each time
        // through to skip the accompanying @ symbol.
        for (int nIndex = 0; nIndex < strData.length(); nIndex += 2)
        {
            strDecrypted += strData.charAt(nIndex);
        }

        return strDecrypted;
    }
}

这是我的界面：

package encryptor;

public interface IEncryptor
{
    public String encrypt(String strData);
    public String decrypt(String strData);
}

工厂类：

package encryptor;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public  class EncryptorFactory
{
    public IEncryptor create() throws IOException
    {
        IEncryptor obEncryptor = null;

        FileReader fileReader = new FileReader ( "C:\\config.dat");
        try 
        {
            BufferedReader br = new BufferedReader(fileReader);
            String line = br.readLine();

            if (  line.equals ("BasicEncrypto")&& br != null)
            {
                obEncryptor= new BasicEncryptor ();
            }

            br.close();
        }
        catch (IOException e) 
        {
            System.err.println("Error: " + e);
        } 
        catch (NumberFormatException e) 
        {
            System.err.println("Invalid number");
        }
        return obEncryptor;
    }
}

Answer 1

您真正需要的是在代码中添加类转换以将int类型转换为字符串类型。以下是您的示例：

String sTest = Integer.toString(2);

从文本文件中读取行并将该类调用到我的主文件中

1 个答案: