java - 错误无法在同一包中找到具有接口(interface)的符号

Question

你好，我的软件向导网络。我有一个问题，为什么我无法编译我的类(class)。我不断收到错误:找不到符号。所有这些类都在同一包 blocklaw 中。我已经尝试了导入语句的每种变体，但似乎无法消除此错误。目录结构是blocklaw --> src --> all_classes_here。 我也尝试更改包声明 blocklaw.src 但仍然没有帮助。 我将在这里分享我的代码，

 package blocklaw;

    import java.security.MessageDigest;
    /*
    * returns a string value of the true fact
    */
    public class TrueFact implements Hashable {
      private String trueFact;
      private String hashFact;
      private String source;
      private String hashSource;
      private int bytesLength;
      private String hashedBytesLength;
      private String hashedHash;

      public TrueFact(String trueFact, String source){
        this.trueFact = trueFact;
        this.source = new Source(source).getSource();
        byte[] bytes = trueFact.getBytes("UTF-8");
        this.bytesLength = bytes.length;
        setHashCode();
      }

      public String getTrueFact(){
         return this.trueFact;
      }

      public String getHashFact(){
        return this.hashFact;
      }

      public String getSource(){
        return this.source;
      }

      public int getbytesLength(){
        return this.bytesLength;
      }

      public String getHashedBytesLength(){
        return this.hashedBytesLength;
      }

      public void setHashCode(){
        this.hashFact = hash(this.trueFact);
        this.hashSource = hash(this.source);
        this.hashedBytesLength = hash(String.valueOf(this.bytesLength));
        this.hashedHash = hash(this.hashFact+this.hashSource+this.hashedBytesLength);
      }

      public String getHashSource(){
        return this.hashSource;
      }

      public String hash(String input){
        try {
           MessageDigest digest = MessageDigest.getInstance("SHA-256");

           //Applies sha256 to our input,
           byte[] hash = digest.digest(input.getBytes("UTF-8"));

           StringBuffer hexString = new StringBuffer(); // This will contain hash as hexidecimal
           for (int i = 0; i < hash.length; i++) {
              String hex = Integer.toHexString(0xff & hash[i]);
              if(hex.length() == 1) hexString.append('0');
              hexString.append(hex);
           }
           return hexString.toString();
        }
        catch(Exception e) {
           throw new RuntimeException(e);
        }
      }
     }

据我了解，同一包中的所有类不需要显式导入。那么为什么我的错误是找不到该符号呢？

以下是Hashable的接口(interface)...

package blocklaw;

public interface Hashable{
    public String hash();
}

Answer 1

正如所讨论的，这些是纠正答案所需遵循的步骤。

Compile Source.java
And the String input parameter to the hash function in Hashable.java
Compile Hashable.java
Now go one folder level up.
Add necessary try catch blocks in TrueFact.java
Build blocklaw/TrueFact.java

这将编译 TrueFact.java。