This question already has answers here:
Java Serializable Object to Byte Array
(12 answers)
Closed 8 years ago.
I have requirement where i want to store Hash Set i have to byte[] in database. I have searched through internet haven't found a solution.
I have following hashset of custom class.
HashSet<MyClass> set = new HashSet<MyClass>();
Please help.
You can serialize it, if the stored data is serializable. Then convert to bytes.
Related
This question already has answers here:
Fastest way to set all values of an array?
(14 answers)
How do I declare and initialize an array in Java?
(31 answers)
Closed 2 years ago.
I have a byte array I want to set to a set X amount of bytes, but I want to initialize it first then assign bytes to it later, index by index.
What should I do? So far I've been just creating a byte array of X bytes, all just filled with FF to make things simple but I feel like this is not the best way.
Thanks
edit: Would the best way just be
byte[] bArr = new byte[X];
??
This question already has answers here:
How to convert byte[] to Byte[] and the other way around?
(9 answers)
Closed 3 years ago.
I want to convert a Byte array into a byte array, but I don't see any way to do so in java without using a loop.
Can someone please tell me a way to make it ?
There is no need for that, because Java has an auto-unboxing system that automatically converts Bytes to bytes. So, you can use them the same way. But if you really have to, you have to use a loop.
This question already has answers here:
Converting 'ArrayList<String> to 'String[]' in Java
(17 answers)
Closed 3 years ago.
I am trying to initialize an array object with a get method which returns an arraylist object. I have tried using .toArray() to convert but it didn't work.
Would Project[] projects = list.toArray(new Project[[0]]) work? The reason it doesn't work normally is because by default toArray returns an Object[], and the JVM is unable to cast that to a Project[]. Passing in the project array allows it to determine the type of the desired array.
This question already has answers here:
Why isn't there a java.lang.Array class? If a java array is an Object, shouldn't it extend Object?
(4 answers)
Closed 3 years ago.
I would like to know what is the base class for byte array (byte[]) in java. For example for String it is java.lang.String.
The answer is byte[].class.
Example:
byte[] receivedMessage = consumer.receiveBody(byte[].class, 15000); // in ms or 15 seconds
This question already has answers here:
Convert string to JSON array
(10 answers)
Closed 7 years ago.
I'm looking for a way to convert this String
[{"season":"w15","club":"belle-plagne"},{"season":"w15","club":"belle-plagne"},{"season":"w15","club":"belle-plagne"}]
that looks like a json array to a json array using the java library json simple
Thx in advance,
best regards
Mayes
you should have check out this example url from json example first. if you have any specific problem, then you should ask specific question.
http://code.google.com/p/json-simple/wiki/DecodingExamples