Trending questions in Java

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How can I seperate digits of a double number in java?

For example : input = 123.456 output = 1 2 3 4 5 6 READ MORE

Apr 4, 2021 in Java by Mehrnaz
edited 4 days ago • 7 views
0 votes
3 answers

How to check if a String is numeric in Java?

Check if a string is numeric public class ...READ MORE

Dec 29, 2020 in Java by Carlos
 • 3,048 views
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2 answers

What's the difference between @JoinColumn and mappedBy when using a JPA @OneToMany association?

JPA mapping annotation can be classified as ...READ MORE

Oct 28, 2020 in Java by bjjj
 • 140 points • 21,741 views
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1 answer

How to get comments by given user in Facebook Graph API? Can we get list of comments made by given user?

Hii kartik, You can get the list of ...READ MORE

May 7, 2020 in Java by Niroj
 • 82,840 points • 13,033 views
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I am getting error in Conversion of csv file to Json

import java.io.File; import java.util.List; import java.util.Map; import com.fasterxml.jackson.databind.MappingIterator; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.SerializationFeature; import ...READ MORE

Mar 5, 2021 in Java by Priya
edited 4 days ago • 13 views
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0 answers

Hi Can someone please guide me

I have a task to convert csv ...READ MORE

Mar 5, 2021 in Java by Priya
edited 4 days ago • 9 views
0 votes
1 answer

How to read all files in a folder from Java?

public void listFilesForFolder(final File folder) { ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 2,532 views
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1 answer

Can't execute jar- file: “no main manifest attribute”

First, it's kind of weird, to see ...READ MORE

Dec 23, 2020 in Java by Gitika
 • 65,770 points • 2,832 views
0 votes
0 answers

how create popup in reactjs for a form like please fill the fill and lenght of the password....???

i want to create the form and ...READ MORE

Feb 20, 2021 in Java by mythili
edited 4 days ago • 8 views
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1 answer

How do I save a String to a text file using Java?

If you're simply outputting text, rather than ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points
edited Jul 6, 2023 by Khan Sarfaraz • 2,194 views
0 votes
1 answer

Can anyone help me i have been struggling for weeks now to solve this problem

Hello, @Tafadzwa, Any way just navigate to C:\Users\user.gradle\caches\ ...READ MORE

Dec 24, 2020 in Java by Gitika
 • 65,770 points • 2,453 views
0 votes
1 answer

How to install Java 8 on Mac

Oracle has a poor record for making ...READ MORE

Dec 23, 2020 in Java by Gitika
 • 65,770 points • 2,412 views
0 votes
1 answer

How do I count the number of occurrences of a char in a String?

My 'idiomatic one-liner' for this is: int count ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 2,107 views
0 votes
1 answer

Implements vs extends: When to use? What's the difference?

Extends is for extending a class. implements are for implementing an interface The difference between ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 2,104 views
0 votes
1 answer

What is a serialVersionUID and why should we use it?

Hello @kartik, SerialVersionUID is a unique identifier for each ...READ MORE

May 28, 2020 in Java by Niroj
 • 82,840 points • 11,326 views
0 votes
2 answers

Reading a plain text file in Java

Read a plain text file: Java Code: import java.io.BufferedReader; import ...READ MORE

Dec 29, 2020 in Java by Nikita
 • 1,842 views
0 votes
1 answer

How to convert Java String into byte[]?

The object your method decompressGZIP() needs is a byte[]. So the ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 1,672 views
0 votes
1 answer

How to round a number to n decimal places in Java?

Use setRoundingMode, set the RoundingMode explicitly to handle your issue ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points
edited Jul 6, 2023 by Khan Sarfaraz • 1,919 views
0 votes
1 answer

When to use LinkedList over ArrayList in Java?

LinkedList and ArrayList are two different implementations of the List ...READ MORE

Dec 21, 2020 in Java by Gitika
 • 65,770 points • 1,919 views
0 votes
4 answers

How to convert a char to a String?

There are two ways you can do ...READ MORE

Dec 29, 2020 in Java by Roshni
 • 10,480 points • 1,412 views
0 votes
2 answers

Java string to date conversion

We can convert String to Date in java using parse() method ...READ MORE

Dec 29, 2020 in Java by Nikita
 • 1,433 views
0 votes
1 answer

How to get the current date/time in Java?

It depends on what form of date/time ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 1,387 views
0 votes
1 answer

How to append text to an existing file in Java?

Java 7+ If you just need to do ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points
edited Jul 6, 2023 by Khan Sarfaraz • 1,316 views
0 votes
1 answer

Sort ArrayList of custom Objects by property

Since Date implements Comparable, it has a compareTo method just like String does. So your ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points • 1,584 views
0 votes
0 answers

How to find all annotated classes in Java?

How can I find all the annotated ...READ MORE

Jan 28, 2021 in Java by Marion
 • 130 points
edited 4 days ago • 7 views
0 votes
2 answers

When to use static methods

Java main() method is always static, so that compiler ...READ MORE

Dec 29, 2020 in Java by Reshma
 • 1,101 views
0 votes
1 answer

Convert ArrayList<String> to String[] array

Use like this. List<String> stockList = new ArrayList<String>(); stockList.add("stock1"); stockList.add("stock2"); String[] ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points • 1,388 views
0 votes
1 answer

What does “Could not find or load main class” mean?

First of all, you need to understand ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points • 1,382 views
0 votes
1 answer

How do I determine whether an array contains a particular value in Java?

Arrays.asList(yourArray).contains(yourValue) Warning: this doesn't work for arrays of ...READ MORE

Dec 21, 2020 in Java by Gitika
 • 65,770 points • 1,390 views
0 votes
1 answer

How to return JSON response from Flask view?

Hello, Pass the summary data to the jsonify function, which ...READ MORE

Nov 20, 2020 in Java by Niroj
 • 82,840 points • 2,699 views
0 votes
0 answers

i got this error "TypeError: require(...).listen is not a function"

var express = require('express')   , http = require('http'); //make ...READ MORE

Jan 21, 2021 in Java by tanimowo
edited 4 days ago • 6 views
0 votes
1 answer

How to install the JDK on Ubuntu Linux?

Open Terminal from Application Dash or press Ctrl+Alt+T Update repository: sudo add-apt-repository ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 863 views
0 votes
2 answers

How to make a new List in Java?

Initializing a List in Java The Java.util.List is a child ...READ MORE

Dec 28, 2020 in Java by Thomas Walenta
 • 904 views
0 votes
2 answers

File to byte[] in Java?

Example 1: Convert File to byte[] import java.io.IOException; import ...READ MORE

Dec 28, 2020 in Java by Reshma
 • 854 views
0 votes
1 answer

How can I solve this: To prevent a memory leak, the JDBC Driver has been forcibly unregistered

What can you do? Ignore these warnings. Tomcat ...READ MORE

Jan 8, 2019 in Java by Daisy
 • 8,140 points • 31,996 views
0 votes
1 answer

How do I convert from int to String?

Normal ways would be Integer.toString(i) or String.valueOf(i). The concatenation will work, ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 789 views
0 votes
1 answer

How to remove the last character from a string?

Hi@akhtar, You can use the StringBuffer class. It provides ...READ MORE

Dec 30, 2020 in Java by MD
 • 95,460 points • 754 views
0 votes
1 answer

What are the differences between a HashMap and a Hashtable in Java?

There are several differences between HashMap and Hashtable in Java: Hashtable is synchronized, whereas HashMap is ...READ MORE

Dec 21, 2020 in Java by Gitika
 • 65,770 points • 1,133 views
0 votes
1 answer

Static Classes In Java

Java has static nested classes but it sounds like ...READ MORE

Dec 23, 2020 in Java by Gitika
 • 65,770 points
edited Jul 5, 2023 by Khan Sarfaraz • 1,008 views
0 votes
1 answer

How to convert a Set to List in Java?

Hi@MD, The most straightforward way to convert a ...READ MORE

Dec 30, 2020 in Java by akhtar
 • 38,260 points
edited Jun 22, 2023 by Khan Sarfaraz • 699 views
0 votes
1 answer

How do I copy an object in Java?

Create a copy constructor: class DummyBean { ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points
edited Jul 4, 2023 by Khan Sarfaraz • 695 views
0 votes
1 answer

Converting array to list in Java

In your example, it is because you ...READ MORE

Dec 23, 2020 in Java by Gitika
 • 65,770 points • 980 views
0 votes
1 answer

How do I join two lists in Java?

In Java 8: List<String> newList = Stream.concat(listOne.stream(), listTwo.stream()) ...READ MORE

Dec 30, 2020 in Java by Gitika
 • 65,770 points • 595 views
0 votes
1 answer

Is it possible to upload a file from desktop to web using Selenide?

Hi, @Nikhil, Yes it's possible to drop a ...READ MORE

Dec 16, 2020 in Java by Gitika
 • 65,770 points • 1,146 views
0 votes
1 answer

How do I generate random integers within a specific range in Java?

Before Java 1.7, the standard way to ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points • 893 views
0 votes
1 answer

Iterate through a HashMap.

Iterate through the entrySet() like so: public static void printMap(Map ...READ MORE

Dec 22, 2020 in Java by Gitika
 • 65,770 points • 856 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
 • 65,770 points • 2,712 views
0 votes
0 answers

I want to switch from technical support to java developer after working 1.6 years in support. Is that possible?

i have working as an administrator and ...READ MORE

Jan 8, 2021 in Java by Edureka
edited 4 days ago • 6 views
0 votes
1 answer

IllegalArgumentException: navigation destination xxx is unknown to this NavController

Hello @kartik, Check currentDestination before calling navigate might be helpful. For ...READ MORE

May 26, 2020 in Java by Niroj
 • 82,840 points • 9,762 views
0 votes
1 answer

Error:serializable class Foo does not declare a static final serialVersionUID field of type long

Hello @kartik, If you're serializing just because you ...READ MORE

Jul 28, 2020 in Java by Niroj
 • 82,840 points • 7,022 views
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