Latest questions in Java

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1 answer

Tail call optimization in JVM

The tail call optimization in JVM is difficult ...READ MORE

Oct 10, 2018 in Java by geek.erkami
 • 2,680 points • 1,520 views
0 votes
1 answer

$ in a variable name in Java

Java compiler uses "$" symbol internally to decorate ...READ MORE

Oct 10, 2018 in Java by code.reaper12
 • 3,500 points • 6,873 views
0 votes
2 answers

How to parse/format dates with LocalDateTime? (Java 8)

Converting LocalDateTime to Time Zone ISO8601 String LocalDateTime ...READ MORE

Dec 6, 2018 in Java by Sushmita
 • 6,920 points • 5,007 views
0 votes
1 answer

Creating an instance using the class name and calling constructor

Yes: Class<?> clazz = Class.forName(className); Constructor<?> ctor = clazz.getConstructor(String.class); Object ...READ MORE

Oct 9, 2018 in Java by Daisy
 • 8,140 points • 3,206 views
0 votes
1 answer

Java's default package

Yes, technically, using the package names should ...READ MORE

Oct 9, 2018 in Java by code.reaper12
 • 3,500 points • 1,293 views
0 votes
1 answer

Can't access static fields in inner classes in Java

Well, the major idea behind this concept ...READ MORE

Oct 9, 2018 in Java by anto.trigg4
 • 3,440 points • 2,230 views
0 votes
2 answers

Reading an InputStream & coverting it into a String in Java?

Apache Commons allows: String myString = IOUtils.toString(myInputStream, "UTF-8"); And ...READ MORE

Aug 30, 2019 in Java by Karan
 • 19,550 points • 1,535 views
0 votes
1 answer

How to display an animated GIF?

Android actually can decode and display animated ...READ MORE

Oct 8, 2018 in Java by sharth
 • 3,370 points • 959 views
0 votes
1 answer

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: How to handle this exception?

You have a com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure java.net.ConnectException: ...READ MORE

Oct 8, 2018 in Java by Parth
 • 4,640 points • 3,026 views
0 votes
2 answers

Why are you not able to declare a class as static in Java?

A static keyword  can be used with ...READ MORE

Jun 11, 2019 in Java by Neha
 • 330 points • 1,964 views
0 votes
2 answers

How to parse a date?

SimpleDateFormat parser=new SimpleDateFormat("EEE MMM d HH:mm:ss zzz ...READ MORE

Dec 6, 2018 in Java by Sushmita
 • 6,920 points • 1,184 views
0 votes
1 answer

Escaping strings in JSON

You can find a JSON library in your ...READ MORE

Oct 4, 2018 in Java by geek.erkami
 • 2,680 points • 24,879 views
0 votes
1 answer

How do you produce a double in Java

double num = 5; When you do this, ...READ MORE

Oct 4, 2018 in Java by anto.trigg4
 • 3,440 points • 1,165 views
0 votes
1 answer

How to Read/Write String from a File in Android

Writing a File in android: private void writeToFile(String ...READ MORE

Oct 3, 2018 in Java by sharth
 • 3,370 points • 7,815 views
0 votes
3 answers

How does the “final” keyword in Java work?

Final is a keyword that is used ...READ MORE

Sep 1, 2019 in Java by DEEPAK KUMAR GUPTA
 • 3,176 views
0 votes
1 answer

Non-static method within Static method in Java

As per my knowledge, you are getting this error ...READ MORE

Sep 28, 2018 in Java by anto.trigg4
 • 3,440 points • 1,670 views
0 votes
1 answer

System.exit() method in Java

System.exit() is a method of System class ...READ MORE

Sep 28, 2018 in Java by code.reaper12
 • 3,500 points • 1,831 views
0 votes
1 answer

“Missing return statement” within if / for / while in Java

Putting a return statement in any of the ...READ MORE

Sep 27, 2018 in Java by code.reaper12
 • 3,500 points • 9,642 views
0 votes
2 answers

Does Java thread.sleep() puts swing ui to sleep?

You are correct about the code putting ...READ MORE

Oct 24, 2018 in Java by Sushmita
 • 6,920 points • 5,628 views
0 votes
1 answer

Find Oracle JDBC driver in Maven repository

Download the jar and place it in ...READ MORE

Sep 26, 2018 in Java by Daisy
 • 8,140 points • 3,723 views
0 votes
1 answer

What is the best Java email address validation method?

Apache Commons is generally known as a ...READ MORE

Sep 26, 2018 in Java by Parth
 • 4,640 points • 1,081 views
0 votes
1 answer

Calling remove in foreach loop in Java

To safely remove from a collection while ...READ MORE

Sep 26, 2018 in Java by sharth
 • 3,370 points • 9,609 views
0 votes
1 answer

Using Jackson to deserialise an array of object

First create a mapper : import com.fasterxml.jackson.databind.ObjectMapper;// in ...READ MORE

Sep 26, 2018 in Java by Sushmita
 • 6,920 points • 5,742 views
0 votes
1 answer

How to convert a string representation of a hex dump to a byte array using Java?

public static byte[] hexStringToByteArray(String s) { ...READ MORE

Sep 26, 2018 in Java by sharth
 • 3,370 points • 2,703 views
0 votes
1 answer

object references an unsaved transient instance - save the transient instance before flushing

You should add cascade="all" (if using xml) ...READ MORE

Sep 26, 2018 in Java by Parth
 • 4,640 points • 35,301 views
0 votes
1 answer

How can we get the current location in Android?

First you need to define a LocationListener to handle ...READ MORE

Sep 25, 2018 in Java by Parth
 • 4,640 points • 1,266 views
0 votes
2 answers

How can I address the unchecked cast warnings?

@SuppressWarnings("unchecked") READ MORE

Mar 21, 2019 in Java by anonymous
 • 26,440 views
0 votes
1 answer

Increasing the JVM memory using command line

You can adjust your JVM memory needs by ...READ MORE

Sep 25, 2018 in Java by geek.erkami
 • 2,680 points • 964 views
0 votes
1 answer

Unescaping HTML character entities in Java

I guess you can use this function: StringEscapeUtils.unescapeH ...READ MORE

Sep 25, 2018 in Java by anto.trigg4
 • 3,440 points • 808 views
0 votes
1 answer

notify() vs. notifyAll() in Java

notify() is used to wake any thread in the wait ...READ MORE

Sep 20, 2018 in Java by code.reaper12
 • 3,500 points • 2,368 views
0 votes
1 answer

Fetching screen resolution using Java

You can fetch the screen resolution using the Toolkit.getScreenSize() method ...READ MORE

Sep 20, 2018 in Java by anto.trigg4
 • 3,440 points • 5,490 views
0 votes
1 answer

revalidate() vs repaint() in Java Swing

You need to call repaint() and revalidate() both in order ...READ MORE

Sep 20, 2018 in Java by code.reaper12
 • 3,500 points • 12,216 views
0 votes
1 answer

Array indexOf() in Java

You can use this indexOf() method through Arrays utility class. If the ...READ MORE

Sep 20, 2018 in Java by geek.erkami
 • 2,680 points • 3,404 views
0 votes
1 answer

Various Advice in Spring AOP

Below are the various advices available in AOP: Before: These types ...READ MORE

Sep 12, 2018 in Java by geek.erkami
 • 2,680 points • 1,734 views
0 votes
1 answer

@RequestMapping annotation in Java Spring

The @RequestMapping annotation in Spring Framework is ...READ MORE

Sep 12, 2018 in Java by code.reaper12
 • 3,500 points • 4,077 views
0 votes
1 answer

Spring AOP vs AspectJ AOP

Well, below I have listed down few ...READ MORE

Sep 10, 2018 in Java by v.liyyah
 • 1,300 points • 1,667 views
0 votes
1 answer

@Qualifier annotation in Spring Framework

When you create more than one bean ...READ MORE

Sep 10, 2018 in Java by code.reaper12
 • 3,500 points • 2,163 views
0 votes
1 answer

Executing commands with parameters in Java

Try using the below command: Runtime.getRuntime().exec(new String[]{"php","/var/www/script.php", "-m", ...READ MORE

Sep 5, 2018 in Java by geek.erkami
 • 2,680 points • 3,548 views
0 votes
1 answer

Java anonymous code blocks

The anonymous code blocks in Java are ...READ MORE

Sep 5, 2018 in Java by anto.trigg4
 • 3,440 points • 2,189 views
0 votes
1 answer

How to download a file from spring controllers?

@RequestMapping(value = "/files/{file_name}", method = RequestMethod.GET) public void ...READ MORE

Sep 4, 2018 in Java by code.reaper12
 • 3,500 points • 3,331 views
0 votes
1 answer

SuppressWarnings (“unchecked”) in Java

@SuppressWarnings("unchecked") is used when Java generics just don't ...READ MORE

Sep 4, 2018 in Java by anto.trigg4
 • 3,440 points • 9,416 views
0 votes
1 answer

Bean life cycle in Spring Bean Factory Container

Bean life cycle in Spring Bean Factory ...READ MORE

Aug 30, 2018 in Java by code.reaper12
 • 3,500 points • 3,750 views
0 votes
1 answer

Add jars to maven 2 build class path without installing them?

wn voteA quick&dirty batch solution (based on Alex's answer): libs.bat @ECHO ...READ MORE

Aug 30, 2018 in Java by samarth295
 • 2,220 points • 1,613 views
0 votes
1 answer

Constructor injection vs Setter injection in Spring Framework

Here, I have listed down few differences. ...READ MORE

Aug 30, 2018 in Java by anto.trigg4
 • 3,440 points • 3,529 views
0 votes
1 answer

Generate UML diagrams from Java code?

You could also give the netbeans UML ...READ MORE

Aug 30, 2018 in Java by samarth295
 • 2,220 points • 1,606 views
0 votes
2 answers

How to check if a string has only letters

You could probably use Java 8 lambda ...READ MORE

Aug 30, 2019 in Java by Karan
 • 19,550 points • 3,896 views
0 votes
1 answer

How to calculate the interval between 2 dates

The following code might be helpful: public static ...READ MORE

Aug 29, 2018 in Java by bug_seeker
 • 15,520 points • 1,334 views
0 votes
1 answer

Enums be subclassed to add new elements?

I suggest you take the other way ...READ MORE

Aug 29, 2018 in Java by Parth
 • 4,640 points • 1,226 views
0 votes
1 answer

Simple HTTP server in Java using only Java SE API

You can write a pretty simple embedded Jetty Java ...READ MORE

Aug 29, 2018 in Java by Parth
 • 4,640 points • 2,169 views
0 votes
2 answers

How do we convert only the second letter of every word in a string to uppercase ?

The following code will perform your desired ...READ MORE

Aug 29, 2018 in Java by curious
 • 560 points • 12,791 views
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