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Java (not to be confused with JavaScript) is a class-based, object-oriented, strongly typed, reflective language and runtime environment (JRE). Java programs are compiled to bytecode and run in a virtual machine (JVM) enabling a "write once, run anywhere" (WORA) methodology.

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How to look for subset in a collection for a collection using lambdaj?

I have a list Class A { int id; String name; String dept; String x; String y; } List<A> multipleA = new Arraylist<A>(); Class B { int id; String dept; ...
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3 views

Refresh Navigation View in eclipse application

I want to Refresh Navigation View in eclipse application. The project explorer in the eclipse application does not show the projects , untill it is refreshed or right clicked on it. How to refresh it ...
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10 views

'e24PaymentPipe' cannot be resolved to payment type

I'm using Tomcat 6 to run a payment script written in Java. This involves running a basic .jsp file and importing some .class files that then redirect the user to the payment platform. Easy. The ...
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3answers
35 views

How do I pass variables between methods in java?

In the main method of my program I have a bunch of scanner input which I have passed into various methods using parameters. In those various methods I have done calculations, creating new variables. ...
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19 views

Java OutOfMemoryError when allocating byte[] within max heap

I'm trying to figure out why I am getting an OOM error even though the byte array I am initializing plus the currently used memory is less than the max heap size (1000MB). Right before the array is ...
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1answer
27 views

Shifting bit values

I have recently started learning java of my own back and I am having trouble with one part in particular. Today I read up on shifting bit values and I was wondering if what I am doing is correct? I ...
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10 views

Regex NOT Operation

I have condition where I have to select anything which is not part of span tag. Input - the <span class='ptc-highlightedSearchResult'>PISTON</span> has their <span ...
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0answers
8 views

How to get content type from blobstore by blobkey?

I get blobkey from datastore. Now I want to use this blobkey to get content type of blob in blobstore. How to do it?
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2answers
12 views

JPA Query Exception to fetch data with join

Dao class @Query("select pt from com.ctpm.rrh.basket.model.user.User as u inner join u.userPaymentTransaction as pt where u = ?") List<UserPaymentTransaction> ...
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1answer
16 views

How to make multiple JTextFields write to one file

I have a project involving a recipe book that saves info like ingredients, utilities, etc. and i need to make the fields that those details are entered in, save that text to a file. Each field is a ...
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2answers
33 views

How to search database within less time

I have near about 10 lakh (1 lakh = 100,000, so 1 million) entries in my database table and I need to use some logic by which I can search within minimum time, is there any algorithms or logic by ...
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2answers
21 views

Concatenating JSTL

I have a HashMap in the controller: HashMap<String, ArrayList<String> map = new HashMap<String, ArrayList<String>(); In the JSP page i want to access this through something like ...
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2answers
46 views

Method Name in Java [on hold]

I need to print from which class the method is called and from which line the method is,how to get the method name,line number of calling class in java and in android?
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Robospice: Sending JSON data inside HTTP request body

I need to send a POST HTTP request using Robospice for Android that will have data in the following format: Content-Type: application/json {'var1':'var1val','telNumber':'var2val'} There ...
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5answers
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“Int cannot be Dereferenced” in Java. Hope for assistance

I'm fairly new to Java and I'm using BlueJ. I keep getting this "Int cannot be dereferenced" error when trying to compile and I'm not sure what the problem is. The error is specifically happening in ...

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