Trending questions in Java

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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
• 6,890 points
1,351 views
0 votes
1 answer

How to encrypt string in Java

String s1="sharth"; char[] s2=s1.toCharArray(); int s3= s2.length; ...READ MORE

Jul 23, 2018 in Java by scarlett
• 1,270 points
749 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
• 6,890 points
1,488 views
0 votes
2 answers

What is the use of toString method in Java and how can I use it ?

Whenever you require to explore the constructor ...READ MORE

Aug 23, 2018 in Java by Daisy
• 8,110 points
1,848 views
0 votes
1 answer

A Java collection of value pairs? (tuples?)

The Pair class is one of those ...READ MORE

Jul 2, 2018 in Java by sharth
• 3,350 points
1,530 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
• 6,890 points
198 views
0 votes
2 answers

How can we pass a function as a parameter in java?

Java 8 and above Using Java 8+ lambda ...READ MORE

Aug 28, 2018 in Java by Daisy
• 8,110 points
262 views
0 votes
1 answer

How to retrieve column names from java.sql.ResultSet?

You may refer the below code: ResultSet ...READ MORE

Jul 4, 2018 in Java by sophia
• 1,400 points
1,327 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
• 6,890 points
190 views
0 votes
1 answer

How can I calculate number of days between two dates?

You may refer this. This might work ...READ MORE

Jul 19, 2018 in Java by Akrati
• 3,170 points
626 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
• 6,890 points
432 views
0 votes
1 answer

How to read an XML file using XPath in Java?

Import the packages required to work with ...READ MORE

Jun 14, 2018 in Java by Akrati
• 3,170 points
2,032 views
0 votes
3 answers

How can we use java.String.format in Scala?

String aString = "world"; int aInt = 20; String.format("Hello, ...READ MORE

Aug 29, 2018 in Java by Daisy
• 8,110 points
597 views
0 votes
2 answers

How can I get the filenames of all files in a folder which may or may not contain duplicates

List<String> results = new ArrayList<String>(); File[] files = ...READ MORE

Sep 12, 2018 in Java by Sushmita
• 6,890 points
889 views
0 votes
2 answers

Counting no of Occurrence of a particular character inside a string in Java

We can find out the no. of ...READ MORE

Sep 7, 2018 in Java by Sushmita
• 6,890 points
1,164 views
0 votes
1 answer

How to add row in JTable

To create a table: JTable table = new ...READ MORE

Jun 29, 2018 in Java by Akrati
• 960 points
1,312 views
0 votes
2 answers

How a static map can be initialized?

public class Test { ...READ MORE

Sep 12, 2018 in Java by Sushmita
• 6,890 points
285 views
0 votes
2 answers

What is null in java?

"null" is a reference type and its ...READ MORE

Jul 31, 2018 in Java by Mrunal
• 680 points
136 views
0 votes
3 answers

How to check whether a file exists or not in Java?

Using nio we can check whether file ...READ MORE

Aug 14, 2018 in Java by Sushmita
• 6,890 points
1,699 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
• 3,350 points
593 views
0 votes
2 answers

Performing Iteration over each entry in a 'Map'

In Java 8 you can do it ...READ MORE

Oct 24, 2018 in Java by Sushmita
• 6,890 points
204 views
0 votes
4 answers

Remove extra spaces from string in java

import java.util.regex.Matcher; import java.util.regex.Pattern; String pattern="[\\s]"; String replace=""; part="name=john age=13 year=2001"; Pattern ...READ MORE

Sep 10, 2018 in Java by Parth
• 4,630 points
1,138 views
0 votes
3 answers

How to read input from Console using Scanner Class?

A simple example: import java.util.Scanner; public class Expl { ...READ MORE

Jul 31, 2018 in Java by samarth295
• 2,220 points
1,901 views
0 votes
1 answer

How to use wait() and notify() concept in producer consumer situation

In this program, we have two threads ...READ MORE

Jul 20, 2018 in Java by Kalgi
• 52,310 points
165 views
+1 vote
3 answers

What is the syntax to declare and initialize an array in java?

You can use this method: String[] strs = ...READ MORE

Jul 25, 2018 in Java by samarth295
• 2,220 points
2,081 views
0 votes
1 answer

Why there is the need of getters and setters in java

In Java getters and setters are completely ...READ MORE

Jun 26, 2018 in Java by scarlett
• 1,270 points
1,177 views
0 votes
1 answer

What does NaN mean in Java?

"NaN" stands for "not a number". "Nan" ...READ MORE

Jul 12, 2018 in Java by Akrati
• 960 points
468 views
0 votes
1 answer

Running Command Line in Java

You may refer this: Runtime rt = Runtime.getRuntime(); Process ...READ MORE

Jul 20, 2018 in Java by Akrati
• 960 points
99 views
–1 vote
1 answer

What is the difference between oracle JDK and open JDK

Both OpenJDK and Oracle JDK are created ...READ MORE

Jul 10, 2018 in Java by Akrati
• 3,170 points
568 views
0 votes
1 answer

What is casting variable in java?

Casting is, taking an Object of one ...READ MORE

Jul 17, 2018 in Java by scarlett
• 1,270 points
178 views
0 votes
1 answer

What are the practical uses for AtomicInteger?

There are two main uses of AtomicInteger: As an ...READ MORE

Jul 18, 2018 in Java by Akrati
• 960 points
104 views
0 votes
1 answer

Iterating through a Collection, avoiding ConcurrentModificationException when removing in loop

You can either use the iterator directly ...READ MORE

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

What is the native keyword in Java?

The native keyword is applied to a method to ...READ MORE

Jul 16, 2018 in Java by scarlett
• 1,270 points
173 views
0 votes
2 answers

How to break the nested loop in Java?

You can use break with a label for the ...READ MORE

Sep 20, 2018 in Java by Sushmita
• 6,890 points
306 views
0 votes
1 answer

Calling SOAP web services on Android using JAVA

Android does not provide any sort of ...READ MORE

Jun 28, 2018 in Java by Sushmita
• 6,890 points
934 views
0 votes
3 answers

How can I add new elements to an Array in Java

String[] source = new String[] { "a", ...READ MORE

Sep 19, 2018 in Java by Sushmita
• 6,890 points
553 views
0 votes
1 answer

What is immutable string in java?

In java, string objects are immutable. Immutable simply ...READ MORE

Jul 16, 2018 in Java by Daisy
• 8,110 points
119 views
0 votes
1 answer

What is the difference between static and inner class?

An inner class, cannot be static, so ...READ MORE

Jul 11, 2018 in Java by sophia
• 1,400 points
332 views
0 votes
1 answer

What is Classpath in java?

Classpath is a parameter in the Java virtual machine or ...READ MORE

Jun 5, 2018 in Java by Daisy
• 8,110 points
1,881 views
0 votes
1 answer

How to pretty print XML from Java?

Transformer transformer = TransformerFactory.newInstance().newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2"); //initialize StreamResult ...READ MORE

Jul 4, 2018 in Java by Akrati
• 3,170 points
616 views
0 votes
1 answer

Behavior of Integer Wrapper class and == operator

Well, this is happening because of the ...READ MORE

Jun 6, 2018 in Java by v.liyyah
• 1,300 points
1,820 views
+1 vote
3 answers

Copy Java Array and make a duplicate of it

int[] a = {1,2,3,4,5}; int[] b = Arrays.copyOf(a, ...READ MORE

Aug 30, 2018 in Java by Sushmita
• 6,890 points
491 views
0 votes
2 answers

Change date format in a Java string

You can use LocalDateTime#parse() or ZonedDateTime#parse(), to parse a String in ...READ MORE

Aug 14, 2018 in Java by Sushmita
• 6,890 points
614 views
+1 vote
1 answer

How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

This error means you're trying to load ...READ MORE

Jun 8, 2018 in Java by Rishabh
• 3,640 points
1,680 views
0 votes
1 answer

Convert Milliseconds to “X mins, x seconds” in Java?

I wrote a function which converts milliseconds ...READ MORE

May 30, 2018 in Java by Rishabh
• 3,640 points
2,103 views
0 votes
3 answers

How to convert File to Byte[] in Java?

import java.io.File; import java.nio.file.Files; File file; // ...(file is initialised)... byte[] ...READ MORE

Aug 14, 2018 in Java by samarth295
• 2,220 points
879 views
0 votes
1 answer

Check whether the string is palindrome or not?

You may refer the below code: public static ...READ MORE

Jul 11, 2018 in Java by Akrati
• 3,170 points
291 views
0 votes
1 answer

Difference between JSF, Servlet and JSP?

Servlet - it's java server side layer. JSP ...READ MORE

Jul 2, 2018 in Java by samarth295
• 2,220 points
663 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
• 6,890 points
213 views
0 votes
1 answer

How can we run the .jar file by double clicking on windows 7 (64)?

Use the following method to run the ...READ MORE

Jun 28, 2018 in Java by sharth
• 3,350 points
820 views