Most voted questions in Java

+29 votes
3 answers

How can we set java.library.path in Eclipse?

Go into the library settings for your ...READ MORE

Jul 3, 2018 in Java by sharth
 • 3,370 points • 23,884 views
+17 votes
25 answers

How can I convert String to JSON object in Java?

Hi @Daisy You can use Google gson  for more ...READ MORE

Feb 7, 2019 in Java by Suresh
 • 720 points • 258,632 views
+12 votes
3 answers

How do I set or change the PATH system variable?

First make sure you have installed JDK ...READ MORE

Aug 28, 2018 in Java by slayer
 • 29,370 points • 1,997 views
+11 votes
13 answers

What are the default xmx and xms values ?

Run this code to see all the ...READ MORE

Nov 13, 2018 in Java by anonymous
 • 407,304 views
+9 votes
16 answers

javac' is not recognized as an internal or external command, operable program or batch file.

Check your javac path on Windows using Windows Explorer C:\Program Files\Java\jdk1.7.0_02\bin and ...READ MORE

May 23, 2018 in Java by Rishabh
 • 3,620 points • 477,898 views
+5 votes
11 answers

How to import a jar file in Eclipse?

Click on File > Import. The Import ...READ MORE

Aug 23, 2018 in Java by Daisy
 • 8,140 points • 365,870 views
+5 votes
4 answers

How to execute a python file with few arguments in java?

You can use Java Runtime.exec() to run python script, ...READ MORE

Mar 27, 2018 in Java by DragonLord999
 • 8,450 points
edited Nov 7, 2018 by Omkar • 83,520 views
+4 votes
0 answers

How to Download the Certificate for completion?

How Can I download the the Course ...READ MORE

Apr 17, 2020 in Java by Ajaaypranav
 • 180 points • 7,063 views
+4 votes
1 answer

How to print the individual occurance of elements in Java?

You can use a HashMap to serve ...READ MORE

Dec 4, 2018 in Java by Priyaj
 • 58,020 points • 1,679 views
+4 votes
4 answers

Using while loop i want to print 10 even numbers

Hello @Nitesh, you are pretty much there. ...READ MORE

Nov 22, 2018 in Java by Priyaj
 • 58,020 points • 95,905 views
+4 votes
3 answers

What are the steps to set Java_home on Windows?

Set Java Home JAVA_HOME = C:\Program Files\Java\jdk1.7.0 [Location ...READ MORE

Sep 18, 2018 in Java by Sushmita
 • 6,920 points • 3,008 views
+3 votes
2 answers

How to find all the classes of a package in Java?

Looking on internet I found this page with ...READ MORE

Nov 16, 2020 in Java by Juan
 • 350 points • 349,142 views
+3 votes
14 answers

com.mysql.cj.jdbc.exceptions.communicationsexception :Communications link failure

Exception in thread "main" com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link ...READ MORE

Dec 12, 2024 in Java by jack
edited Mar 6 • 255,716 views
+3 votes
14 answers

“A Non-static method cannot be referenced from a static context” error

Hey Techies, Non-static variables are part of the objects ...READ MORE

Dec 10, 2020 in Java by Roshni
 • 10,440 points • 252,442 views
+3 votes
13 answers

Unable to execute jar- file: “no main manifest attribute”

add a jar/manifest/attributes setting like this: apply plugin: ...READ MORE

Nov 27, 2018 in Java by krishti
 • 219,273 views
+2 votes
1 answer

please someone tell the code to launch an instance in digital ocean using java

In order to create a digital ocean ...READ MORE

Jan 14, 2020 in Java by Sirajul
 • 59,190 points • 1,507 views
+2 votes
0 answers

How can I assign unicode to a variable in JavaScript, but have the script then populate a PDF field not in the unicode, but in the Chinese characters the unicode represents?

Here is the code I am using. ...READ MORE

Jan 13, 2020 in Java by anonymous
 • 140 points • 2,164 views
+2 votes
0 answers

How to add external Jar in modular JavaFX 11 project correctly?

I'm using Java 11 and JavaFX 11. ...READ MORE

Aug 8, 2019 in Java by invzbl3
 • 6,748 views
+2 votes
4 answers

Javac command not working in my windows 10

Check your javac path on Windows using Windows Explorer C:\Program Files\Java\jdk1.7.0_02\bin and ...READ MORE

Aug 6, 2019 in Java by Sirajul
 • 59,190 points • 52,313 views
+2 votes
2 answers

Can you give me the proper difference between java.util.Date vs java.sql.Date ?

 java.sql.Date is a thin wrapper around millisecond value ...READ MORE

Aug 2, 2019 in Java by sampriti
 • 1,120 points • 16,236 views
+2 votes
1 answer

How to pass dynamic JSON request with parameter in POST request using Rest assured java?

here payload is short you can also ...READ MORE

Jul 23, 2020 in Java by Vivek
 • 21,017 views
+2 votes
1 answer

How to import an existing x509 certificate and private key in Java keystore to use in SSL?

keytool does not provide such basic functionality ...READ MORE

Dec 19, 2018 in Java by Daisy
 • 8,140 points • 2,995 views
+2 votes
1 answer

How do I ask the Selenium-WebDriver to wait for few seconds in Java?

There are two ways to wait: explicit ...READ MORE

Dec 19, 2018 in Java by Daisy
 • 8,140 points
edited Dec 19, 2018 by Daisy • 1,337 views
+2 votes
1 answer

What is the meaning of "this" keyword in Java?

public class MyThisTest { private int ...READ MORE

Oct 10, 2018 in Java by Daisy
 • 8,140 points • 1,212 views
+2 votes
2 answers

How to connect to Oracle using Service Name instead of SID?

HII.. I hope this information may help you- Thin-style ...READ MORE

Sep 29, 2020 in Java by SRI
 • 10,672 views
+2 votes
13 answers

How does java.net.SocketException: Connection reset happen ?

You can use wireshark to view the ...READ MORE

Dec 7, 2018 in Java by tushh
 • 256,759 views
+2 votes
3 answers

Listing all the subclasses of a specific class in Java

Try with BurningWave core library. Here an ...READ MORE

Dec 29, 2019 in Java by anonymous
 • 460 points
edited Jan 9, 2020 by anonymous • 15,762 views
+2 votes
10 answers

Convert Java Byte Array - String - Byte Array

Character Stream Vs Byte Stream Character oriented are ...READ MORE

Sep 25, 2018 in Java by carldivin
 • 180 points • 11,499 views
+1 vote
1 answer

error creating bean with name 'entitymanagerfactory' defined in class path resource

To solve your ERROR, I would suggest ...READ MORE

Feb 18, 2022 in Java by Aditya
 • 7,680 points • 162,027 views
+1 vote
1 answer

Google Conversions Not Working - Script Won't Load

To give you a suggestion, you will ...READ MORE

Feb 10, 2022 in Java by Soham
 • 9,730 points • 3,601 views
+1 vote
0 answers

What happens when we pass one invalid argument and valid argument to mvn command? Eg mvn clean -DskipTests -DNgbuild where -DNgbuild is invalid argument and -DskipTests is valid argument

I execute a command "Mvn clean -DskipTests ...READ MORE

Oct 11, 2021 in Java by anonymous
 • 130 points • 864 views
+1 vote
1 answer

Multithreading in Java with priorities

HI, @Juan, By default, a thread inherits the priority of its parent thread. ...READ MORE

Nov 6, 2020 in Java by Gitika
 • 65,730 points • 3,084 views
+1 vote
1 answer

if i given invalid data how to get alert in selenium using java

Hello, Here is some of the method you ...READ MORE

Jul 20, 2020 in Java by Niroj
 • 82,800 points • 1,535 views
+1 vote
1 answer

How to get Alias name of AWS Lambda function from java code?

Hey @Abhishek, you could probably use the ...READ MORE

Apr 1, 2020 in Java by Sirajul
 • 59,190 points • 2,814 views
+1 vote
1 answer

How to generate a class at runtime in Java?

Yes: you can do it with Burningwave ...READ MORE

Mar 16, 2020 in Java by Roberto
 • 460 points
edited Apr 14, 2020 by Roberto • 1,517 views
+1 vote
1 answer

Program for nth prime number without using scanner

Hi @Sneha, you could use something like ...READ MORE

Jan 13, 2020 in Java by Kalgi
 • 52,340 points • 1,704 views
+1 vote
0 answers

I am getting below error "The method readerFor(Class<Map>) is undefined for the type CsvMapper"

I Have requirement to convert csv to ...READ MORE

Dec 29, 2019 in Java by anonymous
 • 160 points • 3,764 views
+1 vote
0 answers

getting below error when trying to conver csv file to json :The method readerFor(Class<Map>) is undefined for the type CsvMapper [closed]

PFB source code: import java.io.File; import java.lang.*; import java.util.Arrays; import java.util.List; import ...READ MORE

Dec 29, 2019 in Java by anonymous
 • 160 points
closed Jan 14, 2020 by Kalgi • 2,416 views
+1 vote
1 answer

Is Java a compiled language or interpreted?

Compiled languages are directly converted into machine ...READ MORE

Dec 18, 2019 in Java by Hannah
 • 18,520 points • 2,197 views
+1 vote
1 answer

how to print this statement in java print(' '*(r-x-1)+'*'*(2*x+1)) ( logic used in python .its perfect) but java wrong output came

In ' '*(r-x-1) and '*'*(2*x+1), you used multiplication ...READ MORE

Dec 22, 2019 in Java by Utsab Bandyopadhyay
 • 1,391 views
+1 vote
0 answers

output occurs but invisible immediately how to rectify this ?

public class evenodd { public static void main(String[] ...READ MORE

Oct 17, 2019 in Java by BIPLAB
 • 130 points • 1,124 views
+1 vote
1 answer

How to create database in MySql using Java?

First, you will have to create connection ...READ MORE

Sep 30, 2019 in Java by Shri
 • 3,705 views
+1 vote
1 answer

How can I solve this example in an easy way??

You can use this code: import java.util.*; public class ...READ MORE

Sep 23, 2019 in Java by Omkar
 • 69,180 points • 1,138 views
+1 vote
1 answer

Adding Jar file to project

Changing the JRE System Library might work.  Right-click ...READ MORE

Sep 4, 2019 in Java by Esha
 • 3,455 views
+1 vote
0 answers

i open the spinner and can save document , but i am not able to save spinner information with my document in android, can u help?

Aug 28, 2019 in Java by DT
 • 130 points • 939 views
+1 vote
2 answers

Java: Nested Methods

public class ObjClass {     ObjClass anyMethod() ...READ MORE

Jan 19, 2020 in Java by zemiak
 • 14,866 views
+1 vote
1 answer

Facing "Unresolved compilation problem : Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )" error when trying to launch firefox from selenium. Can anyone please help me

I think the problem is with this ...READ MORE

Jul 26, 2019 in Java by Venu
 • 5,049 views
+1 vote
0 answers

Initially autowired object has value,it becomes null after paging(using JSF 2.2 and spring 4.01.)

i'm trying to create basic crud operations ...READ MORE

Jul 5, 2019 in Java by swats
 • 1,853 views
+1 vote
1 answer

Can you please explain the difference between string, string buffer and string builder?

String are immutable where as StringBuffer and ...READ MORE

Jul 5, 2019 in Java by Akash
 • 160 points • 1,626 views
+1 vote
0 answers

How to install java on linux operating system?

I read good info about java but ...READ MORE

May 16, 2019 in Java by Vicky
reopened Nov 15, 2024 by Neelam • 921 views
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