Trending questions in Java

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“Could not find or load main class” mean?

Use the final modifier to enforce good initialization. Avoid returning ...READ MORE

Sep 18, 2018 in Java by Sushmita
• 6,890 points
2,777 views
0 votes
1 answer

Generate UML diagrams from Java code?

You could also give the netbeans UML ...READ MORE

Aug 29, 2018 in Java by samarth295
• 2,220 points
343 views
0 votes
1 answer

Add jars to maven 2 build class path without installing them?

wn voteA quick&dirty batch solution (based on Alex's answer): libs.bat @ECHO ...READ MORE

Aug 29, 2018 in Java by samarth295
• 2,220 points
329 views
0 votes
1 answer

What is the difference between Polymorphism, Overriding and Overloading?

As far as I know, the main ...READ MORE

Jun 19, 2018 in Java by scarlett
• 1,270 points
3,375 views
0 votes
2 answers

How does random shuffling of an array

Here is a simple way using an ArrayList: List<Integer> ...READ MORE

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

Can we convert a string to hexadecimal in java

I find this to be an easy ...READ MORE

Jul 4, 2018 in Java by Akrati
• 3,170 points
2,666 views
0 votes
1 answer

Use Servlets with Ajax

Here, we are going to create the ...READ MORE

Jul 16, 2018 in Java by Akrati
• 3,170 points
2,130 views
0 votes
1 answer

How to calculate the interval between 2 dates

The following code might be helpful: public static ...READ MORE

Aug 29, 2018 in Java by bug_seeker
• 15,550 points
184 views
0 votes
2 answers

When to use LinkedList and ArrayList in Java?

ArrayList is what you want. LinkedList is almost always a ...READ MORE

Dec 11, 2018 in Java by Sushmita
• 6,890 points
307 views
0 votes
1 answer

Retrieve a file from a server via SFTP

Below is an example using Apache Common ...READ MORE

Aug 27, 2018 in Java by samarth295
• 2,220 points
231 views
0 votes
1 answer

Why Java String class is declared as final?

String class is made final in Java ...READ MORE

Aug 21, 2018 in Java by code.reaper12
• 3,500 points
454 views
0 votes
3 answers

What is ^ operator in java?

It's bitwise XOR, Java does not have ...READ MORE

Oct 31, 2018 in Java by Sushmita
• 6,890 points
138 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
2,161 views
+1 vote
1 answer

How do I do a HTTP GET?

If you don't want to use external ...READ MORE

Aug 28, 2018 in Java by Neha
• 6,300 points
104 views
0 votes
1 answer

Enums be subclassed to add new elements?

I suggest you take the other way ...READ MORE

Aug 28, 2018 in Java by Parth
• 4,630 points
99 views
0 votes
1 answer

How to pass an object from one activity to another on Android

One option could be letting your custom ...READ MORE

Jun 25, 2018 in Java by Rishabh
• 3,640 points
2,862 views
0 votes
1 answer

Spring configuration file

A Spring configuration file is an XML ...READ MORE

Aug 27, 2018 in Java by v.liyyah
• 1,300 points
119 views
0 votes
1 answer

Performance difference of if/else vs switch statement in Java

The thing you are worried about is ...READ MORE

Jul 26, 2018 in Java by geek.erkami
• 2,680 points
1,474 views
0 votes
1 answer

What is the simplest way to read JSON from a URL in java

Read json from url use url.openStream() and read contents ...READ MORE

Jun 13, 2018 in Java by samarth295
• 2,220 points
3,343 views
0 votes
1 answer

Removing an Integer from a List<Integer> in Java

In Java, the method best suiting your argument ...READ MORE

Aug 24, 2018 in Java by anonymous
170 views
0 votes
1 answer

Gracefully stopping a java thread

The preferable way will be to use a ...READ MORE

Aug 20, 2018 in Java by anto.trigg4
• 3,440 points
333 views
0 votes
1 answer

Iterable.forEach() vs foreach loop

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

Aug 21, 2018 in Java by Parth
• 4,630 points
260 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
• 4,630 points
188 views
0 votes
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
• 4,630 points
122 views
0 votes
1 answer

Replace String with another in java

String s = "HelloSuresh"; s = s.replace("Hello",""); System.out.pri ...READ MORE

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

Join array elements with a separator in Java

Using Java 8, you can easily perform ...READ MORE

Aug 16, 2018 in Java by geek.erkami
• 2,680 points
325 views
0 votes
1 answer

How to resolve the error: could not find or load main class?

If you are getting error: could not ...READ MORE

May 28, 2018 in Java by Parth
• 4,630 points
3,782 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
• 8,110 points
188 views
0 votes
1 answer

What is the difference between hashset and treeset?

HashSet vs TreeSet: 1- Hashset gives better performance (faster) ...READ MORE

Jun 20, 2018 in Java by Akrati
• 3,170 points
2,713 views
0 votes
3 answers

How to parse JSON in Java

import org.json.*; JSONObject obj = new JSONObject(" .... ...READ MORE

Aug 20, 2018 in Java by Daisy
• 8,110 points
2,648 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 13, 2018 in Java by samarth295
• 2,220 points
1,801 views
0 votes
1 answer

How to prevent java.lang.NumberFormatException in Java?

"N/A" is not integer. It must throw NumberFormatException if you ...READ MORE

Jun 26, 2018 in Java by sharth
• 3,350 points
2,407 views
0 votes
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
• 6,890 points
171 views
0 votes
3 answers

Is there any goto statement in java?

So they could be used one day ...READ MORE

Oct 15, 2018 in Java by Daisy
• 8,110 points
206 views
0 votes
3 answers

Increment the date in Java by 1-day

import java.time.LocalDate; public class DateIncrementer { static ...READ MORE

Aug 1, 2018 in Java by Akrati
• 3,170 points
2,647 views
0 votes
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
89 views
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
• 8,110 points
272 views
0 votes
1 answer

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

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

Jul 25, 2018 in Java by Mrunal
• 680 points
964 views
0 votes
3 answers

Check if a String is numeric in Java

Java 8 Lambda Expression is used: String someString ...READ MORE

Sep 3, 2018 in Java by Daisy
• 8,110 points
2,159 views
0 votes
1 answer

Difference between checked and unchecked exception

Checked Exceptions : The exceptions which are checked by ...READ MORE

Jul 16, 2018 in Java by Akrati
• 3,170 points
1,288 views
0 votes
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
• 4,630 points
2,464 views
0 votes
1 answer

java.lang.OutOfMemoryError: GC overhead limit exceeded Error

This simply means that for some reason ...READ MORE

May 31, 2018 in Java by misc.edu04
• 1,440 points
3,228 views
+1 vote
1 answer

What if several ports required by tomacat server at local host are already in use

You've another instance of Tomcat already running. ...READ MORE

May 31, 2018 in Java by Akrati
• 3,170 points
3,187 views
0 votes
1 answer

@Autowired annotation in Spring Framework

The @Autowired annotation provides more accurate control over where ...READ MORE

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

Overriding private or static method in Java

You cannot override a private or static ...READ MORE

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

Maximum depth of the java call stack

Well, there is no definite depth. It ...READ MORE

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

DEX decompilation in Java Sourcecode

down voteaccep It's easy Get these tools: 1) dex2jar to translate dex ...READ MORE

Jun 29, 2018 in Java by Rishabh
• 3,640 points
1,830 views
0 votes
1 answer

How can we set environment variables from java?

For setting the environment variable, you can ...READ MORE

Jun 21, 2018 in Java by Akrati
• 960 points
2,169 views
0 votes
2 answers

How is hashmap different from hashtable?

HashMap and HashTable: 1) Hashtable and Hashmap implement ...READ MORE

Aug 1, 2018 in Java by samarth295
• 2,220 points
2,661 views
0 votes
2 answers

What's the best way to check if a String represents an integer in Java?

You can also use regular expression. str.matches("-?\\d+"); It will ...READ MORE

Aug 9, 2018 in Java by Daisy
• 8,110 points
2,266 views