Most answered questions in Java

0 votes
2 answers

What is the use of final class in java?

In Java, items with the final modifier cannot be ...READ MORE

Oct 5, 2018 in Java by Daisy
 • 8,120 points • 1,645 views
0 votes
2 answers

Can we catch multiple exceptions in the same catch clause in Java?

In Java 6 and before versions, we ...READ MORE

Aug 10, 2018 in Java by sharth
 • 3,370 points • 1,213 views
0 votes
2 answers

How can I Copy files from one directory to another in Java

Java 8 Path sourcepath = Paths.get("C:\\data\\temp\\mydir"); ...READ MORE

Aug 10, 2018 in Java by samarth295
 • 2,220 points • 4,154 views
0 votes
2 answers

Can the size of dynamic array be changed?

import java.util.List; import java.util.ArrayList; import java.util.Random; public class A ...READ MORE

Aug 31, 2018 in Java by Sushmita
 • 6,910 points • 994 views
0 votes
2 answers

How an object array can be converted to string array in java?

System.arraycopy is the most efficient way, but ...READ MORE

Aug 8, 2018 in Java by Sushmita
 • 6,910 points • 4,836 views
0 votes
2 answers

How to convert a JSON String into Object in Java?

You could probably check out Google's Gson: ...READ MORE

Aug 21, 2019 in Java by Sirajul
 • 59,230 points • 3,062 views
0 votes
2 answers

how can we Create instance for generic type in java

private static class SomeContainer<E> { ...READ MORE

Aug 27, 2018 in Java by Sushmita
 • 6,910 points • 26,132 views
0 votes
2 answers

How to convert an int array to string using tostring method in java?

Use java.util.Arrays: String res = Arrays.toString(array); System. ...READ MORE

Aug 16, 2019 in Java by Sirajul
 • 59,230 points • 2,161 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
 • 999 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
 • 8,120 points • 6,841 views
+1 vote
2 answers

Can I convert my Java program to an .exe file?

Launch4j is a cross-platform tool for wrapping ...READ MORE

Oct 18, 2018 in Java by Sushmita
 • 6,910 points • 3,449 views
0 votes
2 answers

Scanner is skipping nextLine() after using next() or nextFoo()?

use input.nextLine(); after your nextInt() function for example:- input.nextInt(); ...READ MORE

May 11, 2019 in Java by Sourav Dangi
 • 17,128 views
0 votes
2 answers

How to sort an ArrayList of custom object by property in Java?

You can Sort using java 8 yourList.sort(Comparator.comparing(Classname::getName)); or  yourList.stream().forEach(a -> ...READ MORE

Aug 14, 2018 in Java by samarth295
 • 2,220 points • 2,761 views
0 votes
2 answers

Java enum lookup using a String

Check this...Java Enum in details READ MORE

Dec 4, 2018 in Java by allenvarna
 • 540 points • 728 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
 • 6,910 points • 10,495 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
 • 6,910 points • 4,290 views
0 votes
2 answers

Determining Class of an Object in Java

You can use: Object instance = new SomeClass(); instance.getClass().getName(); ...READ MORE

Nov 26, 2018 in Java by Sushmita
 • 6,910 points • 1,706 views
0 votes
2 answers

Reserving space for a heap object

Run the JVM with -XX:MaxHeapSize=512m (or any big number ...READ MORE

Aug 26, 2019 in Java by Sirajul
 • 59,230 points • 1,006 views
0 votes
2 answers

When I am running eclispe on my computer it is throwing error. How to resolve it?

If you have downloaded the 64 bit ...READ MORE

Dec 10, 2018 in Java by Sushmita
 • 6,910 points • 794 views
0 votes
2 answers

How can we add an image to a JPanel?

If you are using JPanels, then are ...READ MORE

Sep 20, 2018 in Java by Daisy
 • 8,120 points • 11,028 views
0 votes
2 answers

Connection reset : java.net.SocketException

You should check whether the client program is ...READ MORE

Sep 6, 2018 in Java by Sushmita
 • 6,910 points • 5,581 views
0 votes
2 answers

how to increase heap size in java?

Here is how you can increase the ...READ MORE

Aug 23, 2019 in Java by Sirajul
 • 59,230 points • 1,580 views
0 votes
2 answers

How a static map can be initialized?

public class Test { ...READ MORE

Sep 12, 2018 in Java by Sushmita
 • 6,910 points • 861 views
0 votes
2 answers

How to find out a single character appears in String or not in Java?

You can use string.indexOf('s'). If the 's' is present in string, ...READ MORE

Aug 7, 2018 in Java by Sushmita
 • 6,910 points • 5,177 views
0 votes
2 answers

Java Environment Variables

--- To set java path --- There are ...READ MORE

Dec 3, 2018 in Java by Sushmita
 • 6,910 points • 1,228 views
0 votes
2 answers

How can we add leading zeros to the number in Java?

From Java 1.5 you can use the String.format method. ...READ MORE

Aug 26, 2019 in Java by Sirajul
 • 59,230 points • 4,699 views
0 votes
2 answers

When and how to use Super() keyword in Java?

super() is used to call immediate parent. super() can be ...READ MORE

Jul 9, 2018 in Java by Sushmita
 • 6,910 points • 1,608 views
0 votes
2 answers

How can I convert byte array into hex string in Java?

public static String byteArrayToHex(byte[] a) { ...READ MORE

Aug 29, 2019 in Java by Sirajul
 • 59,230 points • 2,621 views
0 votes
2 answers

How to get input from user using System.console()?

Scanner in = new Scanner(System.in); int i = ...READ MORE

Aug 2, 2018 in Java by Sushmita
 • 6,910 points • 819 views
0 votes
2 answers

How can I split the String with any whitespace character as delimiter?

String string = "Today's weather"; String[] arrayOfString = ...READ MORE

Aug 23, 2019 in Java by Sirajul
 • 59,230 points • 830 views
0 votes
2 answers

Include all the jars in a directory within the Java classpath

Just use lib/*   not lib/*.jar   That's the ...READ MORE

Apr 6, 2019 in Java by anonymous
 • 14,419 views
0 votes
2 answers

Avoiding != null statements

public String getPostcode(Person person) { ...READ MORE

Aug 20, 2018 in Java by Daisy
 • 8,120 points • 512 views
+1 vote
2 answers

Non-static variable cannot be referenced from a static context. Explain?

class Program { int count ...READ MORE

Sep 28, 2019 in Java by anonymous
 • 13,690 views
0 votes
2 answers

What is a StackOverflow Error

stackoverflow error – StackOverflow Error in Java. This error is thrown to ...READ MORE

Aug 29, 2020 in Java by Pistle
 • 1,000 points • 1,851 views
0 votes
2 answers

How to convert ArrayList<String> to String[] in Java

Try this:  String[] strArray = arrayList.toArray(new Str ...READ MORE

Aug 21, 2019 in Java by Sirajul
 • 59,230 points • 774 views
0 votes
2 answers

How can we remove an element from an array in Java?

You can use ArrayUtils class remove method which ...READ MORE

May 24, 2018 in Java by UshaK
 • 2,395 views
0 votes
2 answers

How do I use a Priority Queue

Use the constructor overload which takes a Comparator<? ...READ MORE

Oct 10, 2018 in Java by Sushmita
 • 6,910 points • 782 views
0 votes
2 answers

Explain the functionality of Math.random() method.

You can use java.util.Random class. int myNumber = ...READ MORE

Aug 3, 2018 in Java by Sushmita
 • 6,910 points • 1,010 views
0 votes
2 answers

How can I solve java.lang.NoClassDefFoundError in Java?

NoClassDefFoundError means that the class is present ...READ MORE

Sep 11, 2018 in Java by Sushmita
 • 6,910 points • 33,396 views
0 votes
2 answers

Does Java allow to create static classes?

Java has "static nested classes", but they ...READ MORE

Sep 5, 2018 in Java by Sushmita
 • 6,910 points • 942 views
0 votes
2 answers

I'm getting following error, while i'm running code in windows xp service pack 3 with JDK 6 version.

Till you send the code, I would ...READ MORE

May 16, 2018 in Java by Meci Matt
 • 9,460 points • 2,292 views
0 votes
2 answers

How can I sort values of a Map in Java using its key

Assuming TreeMap is not good for you ...READ MORE

Oct 10, 2018 in Java by Sushmita
 • 6,910 points • 949 views
0 votes
2 answers

How do i create generic array in Java

as first tip you cannot assign value ...READ MORE

Feb 13, 2020 in Java by sama
 • 16,920 views
0 votes
2 answers

How to call one constructor from another in Java?

public class Cons { public static Cons ...READ MORE

Jul 24, 2018 in Java by Akrati
 • 3,190 points • 1,336 views
0 votes
2 answers

How to convert byte array to String and STring to byte array?

The best possible way of conversion between byte[] and String is to ...READ MORE

Aug 22, 2019 in Java by Sirajul
 • 59,230 points • 3,118 views
0 votes
2 answers

Result of character addition in Java

Binary arithmetic operations on char and byte ...READ MORE

Aug 22, 2019 in Java by Sirajul
 • 59,230 points • 4,147 views
0 votes
2 answers

Fetch list of in-between dates using Java

java.time Package The new java.time.package in Java 8 incorporates ...READ MORE

Aug 21, 2019 in Java by Sirajul
 • 59,230 points • 5,432 views
0 votes
2 answers

Get all the permutations of a string in Java

You could use recursion to do this.  Try ...READ MORE

Aug 21, 2019 in Java by Sirajul
 • 59,230 points • 1,913 views
0 votes
2 answers

How to round up a value to 2 decimal places?

double d = 2.34568; DecimalFormat f = new ...READ MORE

Aug 30, 2018 in Java by Sushmita
 • 6,910 points • 1,083 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 • 8,782 views
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