Trending questions in Java

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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
• 6,890 points
189 views
0 votes
1 answer

Why do we use threads in Java?

Reasons for using Multithreading in Java: When a ...READ MORE

Nov 2, 2018 in Java by nsv999
• 5,520 points
329 views
0 votes
2 answers

How can we Split Java String by New Line?

If you don’t want empty lines: String.split("[\\r\\n]+") READ MORE

Aug 22, 2018 in Java by Daisy
• 8,110 points
5,017 views
0 votes
1 answer

Retrieving the path of a running jar file

Its quite simple. Try using the below ...READ MORE

May 25, 2018 in Java by geek.erkami
• 2,680 points
7,184 views
0 votes
2 answers

Exception found while using Thread.sleep() and wait() in Java

A simpler way to wait is to ...READ MORE

Aug 13, 2018 in Java by samarth295
• 2,220 points
5,760 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
• 8,110 points
1,813 views
0 votes
1 answer

Writing a UTF-8 file with Java

You can make use of a FileOutputStream rather than ...READ MORE

Oct 15, 2018 in Java by anto.trigg4
• 3,440 points
962 views
0 votes
1 answer

Escaping strings in JSON

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

Oct 3, 2018 in Java by geek.erkami
• 2,680 points
1,451 views
0 votes
2 answers

How to play .mp3 and .wav in Java?

We can use Java API to play ...READ MORE

Dec 7, 2018 in Java by Sushmita
• 6,890 points
1,862 views
0 votes
1 answer

Affinity in Java thread

Well, as far as I know, I ...READ MORE

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

How to tell Jackson to ignore a field during serialization if its value is null?

To suppress serializing properties with null values ...READ MORE

Jul 4, 2018 in Java by Rishabh
• 3,640 points
5,354 views
0 votes
1 answer

Default Object.toString() in hashcode

Well, the hash code object is the ...READ MORE

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

varargs in Java

Well, varargs are generally used to deal ...READ MORE

Oct 31, 2018 in Java by code.reaper12
• 3,500 points
198 views
0 votes
1 answer

Trusting all certificates using HttpClient over HTTPS

Note: Do not implement this in production ...READ MORE

Jun 25, 2018 in Java by Rishabh
• 3,640 points
5,726 views
0 votes
1 answer

HTML Parsing in Java

Well, to parse HTML I used JTidy.  Basically, ...READ MORE

Nov 2, 2018 in Java by geek.erkami
• 2,680 points
93 views
0 votes
1 answer

Error - trustAnchors parameter must be non-empty

This bizarre message means that the truststore ...READ MORE

Oct 29, 2018 in Java by Daisy
• 8,110 points
223 views
0 votes
1 answer

How can we handle the javax.net.ssl.SSLHandshakeException?

import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; import java.io.OutputStream; // ...READ MORE

Oct 10, 2018 in Java by Daisy
• 8,110 points
1,005 views
0 votes
2 answers

How to initialize multi-dimensional array in java?

a multidimensional array can define an array ...READ MORE

Mar 18, 2019 in Java by monica jesvina
220 views
0 votes
1 answer

How can we encrypt a String in Java?

Let's assume the bytes to encrypt are ...READ MORE

Oct 26, 2018 in Java by Sushmita
• 6,890 points
250 views
0 votes
1 answer

Array indexOf() in Java

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

Sep 19, 2018 in Java by geek.erkami
• 2,680 points
1,811 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
• 8,110 points
927 views
0 votes
2 answers

Is there a SortedList in Java?

Since all lists are already "sorted" by ...READ MORE

Nov 2, 2018 in Java by Sushmita
• 6,890 points
2,433 views
0 votes
1 answer

Java String interning

The String.intern() method of Java Strings ensures ...READ MORE

Oct 25, 2018 in Java by geek.erkami
• 2,680 points
174 views
0 votes
2 answers

How can we add the local JAR files to the Maven Project in Java?

Firstly I would like to give credit ...READ MORE

Nov 5, 2018 in Java by Sushmita
• 6,890 points
3,019 views
0 votes
1 answer

Why “non-static method cannot be referenced from a static context”?

You can't call something that doesn't exist. ...READ MORE

Oct 17, 2018 in Java by sharth
• 3,350 points
488 views
0 votes
1 answer

How to encode the HTTP URL address in Java?

Use one of the constructors with more ...READ MORE

Oct 23, 2018 in Java by Sushmita
• 6,890 points
215 views
0 votes
1 answer

Usage of abstract class and interface

Well let me draw a clear line ...READ MORE

Oct 23, 2018 in Java by geek.erkami
• 2,680 points
212 views
0 votes
1 answer

Arrays are passed by value or passed by reference in Java?

Arrays are not a primitive type in ...READ MORE

Jul 18, 2018 in Java by sophia
• 1,400 points
4,390 views
0 votes
1 answer

Remote debugging a Java application

I noticed that some people are cutting ...READ MORE

Oct 16, 2018 in Java by Sushmita
• 6,890 points
514 views
0 votes
1 answer

Optional return type of getter() in Java 8

Well, you can do that but originally ...READ MORE

Oct 23, 2018 in Java by code.reaper12
• 3,500 points
110 views
0 votes
1 answer

Play MP3 files usng Java API

I don't believe the java AudioStream class ...READ MORE

May 10, 2018 in Java by Rishabh
• 3,640 points
7,268 views
0 votes
1 answer

Recursively delete directories in Java

You can try using the FileUtils class of Apache's commons-io: FileUtils.deleteDirectory(new ...READ MORE

Oct 22, 2018 in Java by code.reaper12
• 3,500 points
121 views
0 votes
1 answer

Number of Characters in Java String

I think you can make use of ...READ MORE

Oct 22, 2018 in Java by anto.trigg4
• 3,440 points
87 views
0 votes
2 answers

Performing HTTP POST operation in JAVA

I'm using JSON-Java to build my JSON object: JSONObject json ...READ MORE

Nov 26, 2018 in Java by Sushmita
• 6,890 points
2,337 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 8, 2018 in Java by anto.trigg4
• 3,440 points
557 views
0 votes
1 answer

$ in a variable name in Java

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

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

What is the meaning of 'Synchronized'?

The synchronized keyword is about different threads reading and ...READ MORE

Oct 17, 2018 in Java by Parth
• 4,630 points
158 views
0 votes
1 answer

Importing properties file from Java package

In case your class is present within ...READ MORE

Oct 15, 2018 in Java by code.reaper12
• 3,500 points
95 views
0 votes
1 answer

System.exit() method in Java

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

Sep 27, 2018 in Java by code.reaper12
• 3,500 points
864 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
• 8,110 points
218 views
0 votes
1 answer

Java equals() vs Arrays.equals()

Here, array1.equals(array2)meansarray1 == array2 That is, it checks whether ...READ MORE

Oct 11, 2018 in Java by code.reaper12
• 3,500 points
252 views
0 votes
1 answer

Static methods can't be abstract in Java

Well, Java doesn't allow this because of ...READ MORE

Oct 12, 2018 in Java by v.liyyah
• 1,300 points
193 views
0 votes
1 answer

How to use ThreadLocal variable

You can use a ThreadLocal variable when you have some ...READ MORE

Oct 10, 2018 in Java by code.reaper12
• 3,500 points
142 views
0 votes
1 answer

Randomly selecting an element from an array

For randomly selecting an element, java.util.Random provides ...READ MORE

Oct 11, 2018 in Java by anto.trigg4
• 3,440 points
76 views
0 votes
1 answer

Tail call optimization in JVM

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

Oct 9, 2018 in Java by geek.erkami
• 2,680 points
145 views
0 votes
1 answer

How to convert or cast hashmap to JSON object in Java, and again convert JSON object to JSON string?

You can use: new JSONObject(map); READ MORE

Jun 27, 2018 in Java by Akrati
• 3,170 points
4,628 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
• 3,350 points
684 views
0 votes
1 answer

How can we return a JSON object from a Java Servlet?

response.setContentType("application/json"); // Get the printwriter object from response ...READ MORE

Jul 6, 2018 in Java by sharth
• 3,350 points
4,208 views
0 votes
2 answers

How can I get current time in YYYY:MM:DD HH:MI:Sec:Millisecond format in Java?

public String getCurrentTimeStamp() { ...READ MORE

Sep 21, 2018 in Java by Parth
• 4,630 points
4,045 views
0 votes
1 answer

Java's default package

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

Oct 8, 2018 in Java by code.reaper12
• 3,500 points
114 views