how to convert object to string in java

Question

I have a function that returns map value (String) as a generic Object. How do I convert it back to string. I tried toString() but all i get is end[Ljava.lang.String;@ff2413

public Object getParameterValue(String key) {     Iterator iterator=params.entrySet().iterator();      while(iterator.hasNext())     {         Map.Entry me=(Map.Entry)iterator.next();         String[] arr=(String[])me.getValue();         log.info(me.getKey().toString()+"="+arr[0]);     }     if(params.containsKey(key))     {         log.info(key+"="+params.get(key));         return params.get(key);     }       return null; } 

Receiving end

String temp=data.getParameterValue("request").toString(); log.info("end"+temp); 

log.info(me.getKey().toString()+"="+arr[0]); give me an output

 [email protected] request=login projectid=as 

Answer 1

I'm afraid your map contains something other than String objects. If you call toString() on a String object, you obtain the string itself.

What you get [Ljava.lang.String indicates you might have a String array.

Answer 2

Might not be so related to the issue above. However if you are looking for a way to serialize Java object as string, this could come in hand

package pt.iol.security;  import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; import org.apache.commons.codec.binary.Base64;  public class ObjectUtil {      static final Base64 base64 = new Base64();      public static String serializeObjectToString(Object object) throws IOException {         try (                 ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();                 GZIPOutputStream gzipOutputStream = new GZIPOutputStream(arrayOutputStream);                 ObjectOutputStream objectOutputStream = new ObjectOutputStream(gzipOutputStream);) {             objectOutputStream.writeObject(object);             objectOutputStream.flush();             return new String(base64.encode(arrayOutputStream.toByteArray()));         }     }      public static Object deserializeObjectFromString(String objectString) throws IOException, ClassNotFoundException {         try (                 ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(base64.decode(objectString));                 GZIPInputStream gzipInputStream = new GZIPInputStream(arrayInputStream);                 ObjectInputStream objectInputStream = new ObjectInputStream(gzipInputStream)) {             return objectInputStream.readObject();         }     } }