Trending questions in Java

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How to add row in JTable

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

Jun 29, 2018 in Java by Akrati
 • 960 points • 3,292 views
0 votes
2 answers

Escape Characters in Java

These are escape characters which are used ...READ MORE

Oct 15, 2018 in Java by Daisy
 • 8,140 points • 1,111 views
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1 answer

Double decimal formatting in Java

Using String.format, you can do this: double price ...READ MORE

Aug 23, 2018 in Java by Parth
 • 4,640 points • 879 views
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1 answer

What is the difference between getPath(), getAbsolutePath() and getCanonicalPath() in Java?

getPath() - returns a String which denotes the ...READ MORE

Jul 26, 2018 in Java by Mrunal
 • 680 points • 2,087 views
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1 answer

Checking results values using Java ResultSet

As per my knowledge what you are ...READ MORE

Aug 16, 2018 in Java by code.reaper12
 • 3,500 points • 1,096 views
0 votes
1 answer

How to replace 2 or more spaces with a single space in String and how to delete leading and trailing spaces?

before=" Hello world "; String after ...READ MORE

Aug 22, 2018 in Java by Parth
 • 4,640 points • 824 views
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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 • 2,584 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
 • 6,920 points • 2,967 views
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1 answer

Iterable.forEach() vs foreach loop

The advantage comes into account when the ...READ MORE

Aug 21, 2018 in Java by Parth
 • 4,640 points • 793 views
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1 answer

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK

In your Eclipse IDE, go into Window > Preferences > Java > Installed JREs > ...READ MORE

Jun 18, 2018 in Java by Parth
 • 4,640 points • 3,533 views
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2 answers

How do I rename a file using Java

// File (or directory) with old name File ...READ MORE

Oct 5, 2018 in Java by Sushmita
 • 6,920 points • 927 views
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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
 • 8,140 points • 1,716 views
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1 answer

How to encrypt string in Java

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

Jul 24, 2018 in Java by scarlett
 • 1,290 points • 1,943 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 • 2,556 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
 • 3,370 points • 2,683 views
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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
 • 8,140 points • 2,046 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 • 3,751 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
 • 6,920 points • 2,752 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
 • 6,920 points • 1,355 views
0 votes
1 answer

Purpose of “String args[]” in the “psvm” of Java

Let me give you the complete explanation ...READ MORE

May 7, 2018 in Java by code.reaper12
 • 3,500 points • 4,864 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
 • 6,920 points • 1,105 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
 • 6,920 points • 2,035 views
0 votes
1 answer

@Component vs @Repository vs @Service in Spring Framework

As you might be knowing, all these ...READ MORE

May 29, 2018 in Java by geek.erkami
 • 2,680 points • 3,799 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
 • 3,620 points • 3,308 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
 • 6,920 points • 1,384 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 15, 2018 in Java by samarth295
 • 2,220 points • 2,425 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 • 1,157 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
 • 3,190 points • 2,041 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
 • 3,190 points • 1,397 views
0 votes
1 answer

How can we import javax.servlet API in Eclipse?

Before installing Eclipse, ensure that you are ...READ MORE

Jun 7, 2018 in Java by Parth
 • 4,640 points • 3,197 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
 • 8,140 points • 3,271 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
 • 6,920 points • 1,883 views
0 votes
1 answer

While using next() or nextfoo() , the upcoming nextLine() is skipped by scanner

That's because the Scanner.nextInt method does not ...READ MORE

Jun 6, 2018 in Java by mitto
 • 160 points • 3,210 views
0 votes
2 answers

How to concatenate two arrays in Java?

public <T> T[] concatenate(T[] a, T[] b) ...READ MORE

Jul 19, 2018 in Java by Sushmita
 • 6,920 points • 3,165 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
 • 6,920 points • 1,220 views
0 votes
2 answers

How a static map can be initialized?

public class Test { ...READ MORE

Sep 12, 2018 in Java by Sushmita
 • 6,920 points • 1,210 views
0 votes
1 answer

Examples of GoF Design Patterns in Java's core libraries

Observer pattern throughout whole swing (Observable, Observer) MVC also ...READ MORE

Jun 27, 2018 in Java by developer_1
 • 3,350 points • 2,283 views
+1 vote
1 answer

concat() vs “+” operator : In Java for String concatenation

Basically, there are two important differences between ...READ MORE

Apr 27, 2018 in Java by Rishabh
 • 3,620 points • 4,862 views
0 votes
1 answer

Multiple return statements in Java

Yes, you have guessed it right. Language ...READ MORE

Jun 28, 2018 in Java by geek.erkami
 • 2,680 points • 2,227 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 • 1,518 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
 • 52,350 points • 1,222 views
0 votes
2 answers

How can I create File and write data in it using Java?

import java.io.BufferedWriter; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; public class WriteFiles{ ...READ MORE

Jul 26, 2018 in Java by samarth295
 • 2,220 points • 3,090 views
0 votes
1 answer

Get parameters from the URL with JSP

To delete the subject record with its ...READ MORE

May 29, 2018 in Java by Parth
 • 4,640 points • 3,474 views
0 votes
3 answers

Adding text to a file using Java

try { final Path ...READ MORE

Sep 6, 2018 in Java by Sushmita
 • 6,920 points • 1,575 views
0 votes
1 answer

Behavior of Integer Wrapper class and == operator

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

Jun 7, 2018 in Java by v.liyyah
 • 1,300 points • 2,992 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
 • 6,920 points • 1,376 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
 • 1,290 points • 2,068 views
0 votes
3 answers

How to check whether a string is empty or not? Is there a function for this?

str != null && str.length() != 0 alternatively str ...READ MORE

Sep 11, 2018 in Java by Sushmita
 • 6,920 points • 1,617 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
 • 3,370 points • 1,976 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
 • 3,620 points • 3,201 views
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