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Java Java Data Structures Getting There Type Casting

Stuck with Objects and packages in Java Datastructures

Im stuck getting the code right for object typcasting. I believe i understand the concept, but im not sure i have everything yet.

Help would be appreciated.

Chris

com/example/BlogPost.java
package com.example;

import java.util.Date;

public class BlogPost {
    private String mAuthor;
    private String mTitle;
    private String mBody;
    private String mCategory;
    private Date mCreationDate;

  String returnString = getTitleFromObject("Testing", new com.example.BlogPost)

  public Object getTitleFromObject ( (String passedopj) || (String passedob2 && com.example.BlogPost)) {
     if (instanceof passedobj == "String") {
        return ((String)) passedobj; 
      }
      if (passedobj2 && instanceof  passedobj2 == "String") {
           return ((String)) passedobj2; 
      }
      if ( (passedobj2 && instanceof passwdobj2 == "String");
          return  ((String)) passedobj2;
      else { 
          return passedobj2;
      }
      if ( com.example.BlogPost  && instanceof (com.example.BlogPost) == "String") {
          return ((String)) com.example.BlogPost;
      }
      else {
        return com.example.BlogPost;
      }

    }
    public BlogPost(String author, String title, String body, String category, Date creationDate) {
      mAuthor = author;
      mTitle = title;
      mBody = body;
      mCategory = category;
      mCreationDate = creationDate;
    }

    public String getAuthor() {
      return mAuthor;
    }

    public String getTitle() {
      return mTitle;
    }

    public String getBody() {
      return mBody;
    }

    public String getCategory() {
      return mCategory;
    }

    public Date getCreationDate() {
      return mCreationDate;
    }
}
TypeCastChecker.java
import com.example.BlogPost;

public class TypeCastChecker {
  /***************
  I have provided 2 hints for this challenge.
  Change `false` to `true` in one line below, then click the "Check work" button to see the hint.
  NOTE: You must set all the hints to false to complete the exercise.
  ****************/
  public static boolean HINT_1_ENABLED = false;
  public static boolean HINT_2_ENABLED = false;

  public static String getTitleFromObject(Object obj) {
    // Fix this result variable to be the correct string.
    String result = "";
    return result;
  }
}

2 Answers

Michael Clark
Michael Clark
16,324 Points

HI Chris

Looks like you need to put the code in the TypeCastChecker.java. For example to pass the first task

import com.example.BlogPost;

public class TypeCastChecker {
  /***************
  I have provided 2 hints for this challenge.
  Change `false` to `true` in one line below, then click the "Check work" button to see the hint.
  NOTE: You must set all the hints to false to complete the exercise.
  ****************/
  public static boolean HINT_1_ENABLED = false;
  public static boolean HINT_2_ENABLED = false;

  public static String getTitleFromObject(Object obj) {
    // Fix this result variable to be the correct string.
    String result = "";
    if (obj instanceof java.lang.String){
      result = (String) obj;
    }
  return result;
  }
}```

Yup, got both challenges from this one.

Thanks Chris