Most answered questions in Java

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1 answer

"No mapping found for HTTP request with URI[....] in DispatherServlet"

Your standard Spring MVC application will serve ...READ MORE

Jun 6, 2018 in Java by prasad
 • 160 points • 21,111 views
0 votes
1 answer

Java URL encoding of query string parameters

I would not use URLEncoder. Besides being incorrectly ...READ MORE

Jun 1, 2018 in Java by Rishabh
 • 3,620 points • 17,031 views
0 votes
1 answer

Decompiling Java Class Files

There are a few decompilers out there... ...READ MORE

Jun 1, 2018 in Java by Rishabh
 • 3,620 points • 987 views
0 votes
1 answer

How to getters and setters work in java

In Java, getter and setter are two ...READ MORE

Jun 1, 2018 in Java by Daisy
 • 8,120 points • 1,473 views
0 votes
1 answer

what does javabean actually means?

A JavaBean is just a standard All properties ...READ MORE

Jun 7, 2018 in Java by anonymous
 • 471 views
0 votes
1 answer

Does python have an equivalent to Java Class.forName()?

This is found in the python standard ...READ MORE

Jun 1, 2018 in Java by Parth
 • 4,630 points • 1,211 views
0 votes
1 answer

How can we add JTable in JPanel with null layout?

The JPanel should have some layout manager. JTable ...READ MORE

Jun 1, 2018 in Java by Parth
 • 4,630 points • 1,221 views
0 votes
1 answer

How to run a JAR file in Java?

The command given below will help you ...READ MORE

Jun 1, 2018 in Java by Parth
 • 4,630 points • 7,155 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
 • 1,450 points • 4,278 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
 • 3,190 points • 5,736 views
0 votes
1 answer

How to pad an integer with zeros on the left in Java?

Use java.lang.String.format() method. String.format("%05d", number ...READ MORE

May 31, 2018 in Java by Daisy
 • 8,120 points • 2,075 views
0 votes
1 answer

Is it possible to create a memory leak with Java

Here's a good way to create a memory ...READ MORE

May 31, 2018 in Java by Parth
 • 4,630 points • 2,095 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 • 2,856 views
0 votes
1 answer

How to encode data using Base64 in Java?

import org.apache.commons.codec.binary.Base64; We can not use sun.* packages ...READ MORE

May 30, 2018 in Java by Sushmita
 • 6,910 points • 863 views
0 votes
1 answer

How to decode Base64 data in Java?

Java SE has the parser called JAXB, ...READ MORE

May 30, 2018 in Java by sharth
 • 3,370 points • 975 views
0 votes
1 answer

How to set Encoding in Java ?

Unfortunately, the file.encoding property has to be specified as ...READ MORE

May 29, 2018 in Java by Rishabh
 • 3,620 points • 15,912 views
0 votes
1 answer

Unexpected result on Subtracting Times

ou've encountered a local time discontinuity: When local standard ...READ MORE

May 29, 2018 in Java by Rishabh
 • 3,620 points • 446 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 • 3,323 views
0 votes
1 answer

Injecting property value into Spring Bean using annotations

I think you can easily perform this ...READ MORE

May 29, 2018 in Java by code.reaper12
 • 3,500 points • 2,517 views
0 votes
1 answer

parse int value from a char

Check Character.getNumericValue(char). String element = "el7"; int x = Character.getNumericValue(element.charAt(2)); System.out.println("x=" ...READ MORE

May 29, 2018 in Java by Parth
 • 4,630 points • 512 views
0 votes
1 answer

get a class instance of generics type T

The short answer is, that there is ...READ MORE

May 29, 2018 in Java by Parth
 • 4,630 points • 4,445 views
0 votes
1 answer

The best way to filter a Java Collection?

 this problem is solved using streams and ...READ MORE

May 29, 2018 in Java by Parth
 • 4,630 points • 657 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
 • 4,630 points • 3,136 views
0 votes
1 answer

Encode String to UTF-8

String objects in Java use the UTF-16 ...READ MORE

May 29, 2018 in Java by Rishabh
 • 3,620 points • 992 views
0 votes
1 answer

Use of Static Keyword in a Class

It means that there is only one ...READ MORE

May 29, 2018 in Java by Rishabh
 • 3,620 points • 457 views
0 votes
1 answer

How to implement constants in java

Here is the solution- public static final TYPE ...READ MORE

May 28, 2018 in Java by sophia
 • 1,400 points • 435 views
0 votes
1 answer

Why java have transient fields?

Variables may be marked transient to indicate that they ...READ MORE

May 28, 2018 in Java by Daisy
 • 8,120 points • 818 views
0 votes
1 answer

How to run the JAR files in windows?

Following are the steps to run the ...READ MORE

May 28, 2018 in Java by Parth
 • 4,630 points • 899 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 • 10,852 views
0 votes
1 answer

How does contains() method work in evaluating objects?

Generally you should also override hashCode() each time you ...READ MORE

May 25, 2018 in Java by Rishabh
 • 3,620 points • 802 views
0 votes
1 answer

Importing classes in JSP

Use Page Directive to import a Class ...READ MORE

May 25, 2018 in Java by Rishabh
 • 3,620 points • 26,792 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 • 10,342 views
0 votes
1 answer

NoClassDefFoundError in Java

Can’t tell you the exact reason as ...READ MORE

May 25, 2018 in Java by v.liyyah
 • 1,300 points • 2,292 views
0 votes
1 answer

How to download and save a file from Internet using Java?

public void saveUrl(final String filename, final String ...READ MORE

May 25, 2018 in Java by Rishabh
 • 3,620 points • 729 views
0 votes
1 answer

How to calculate method execution time in Java ?

Use the following code : new Timer(""){{ ...READ MORE

May 25, 2018 in Java by Rishabh
 • 3,620 points • 1,524 views
0 votes
1 answer

What is the difference between package private, public, protected?

Modifier Class Package Subclass World Public Y Y Y Y Protected Y Y Y N No modifier Y Y N N private Y N N N   Public: Any package, any class accessibility is ...READ MORE

May 24, 2018 in Java by Parth
 • 4,630 points • 1,369 views
0 votes
1 answer

What is the 'instanceof' operator used for in Java?

It's an operator that returns true if ...READ MORE

May 23, 2018 in Java by Rishabh
 • 3,620 points • 810 views
0 votes
1 answer

Overloaded method for null in Java

The method invoked here will be the ...READ MORE

May 23, 2018 in Java by code.reaper12
 • 3,500 points • 748 views
0 votes
1 answer

Working of post increment operator in Java

Well, I think the confusion is because ...READ MORE

May 23, 2018 in Java by geek.erkami
 • 2,680 points • 570 views
0 votes
1 answer

How can we resolve ClassNotFoundException in Java?

Your classpath is broken. Depending on how you ...READ MORE

May 22, 2018 in Java by Akrati
 • 3,190 points • 1,012 views
0 votes
1 answer

How to remove ‘char’ from a String?

Hi...here you can try using the overloaded ...READ MORE

May 22, 2018 in Java by code.reaper12
 • 3,500 points • 516 views
0 votes
1 answer

Which is the best GUI designer for Eclipse?

Windows Builder Pro is the best GUI ...READ MORE

May 21, 2018 in Java by Akrati
 • 3,190 points • 1,597 views
0 votes
1 answer

How can I make the return type of a method generic?

First of all, define callFriend: public <T extends ...READ MORE

May 19, 2018 in Java by sharth
 • 3,370 points • 611 views
0 votes
1 answer

Convert comma-separated String to ArrayList?

List<String> alist = Arrays.asList(str.split("\\s*,\\s*")); The above code splits ...READ MORE

May 17, 2018 in Java by sharth
 • 3,370 points • 2,793 views
0 votes
1 answer

How to retrieve current stack trace?

Yes, in Java we do have a ...READ MORE

May 17, 2018 in Java by code.reaper12
 • 3,500 points • 1,602 views
0 votes
1 answer

Replacing a String with a character

Yes, you are missing out on a ...READ MORE

May 17, 2018 in Java by geek.erkami
 • 2,680 points • 441 views
0 votes
1 answer

How can I get Key from their respective Values

public class NewClass1 { ...READ MORE

May 16, 2018 in Java by Parth
 • 4,630 points • 489 views
0 votes
1 answer

How to split Strings by space in Java ?

You can use split() method. str = "Hello ...READ MORE

May 16, 2018 in Java by sharth
 • 3,370 points • 1,322 views
0 votes
1 answer

How to set a timer in Java?

To work on timer in java, you ...READ MORE

May 16, 2018 in Java by Daisy
 • 8,120 points • 993 views
0 votes
1 answer

Formatting Double Value in Java

An alternative is to use String.format: double[] arr = ...READ MORE

May 15, 2018 in Java by Rishabh
 • 3,620 points • 2,322 views
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