Trending questions in Java

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Copying Objects in Java

class DummyBean { private String dummy; ...READ MORE

Aug 6, 2018 in Java by Sushmita
 • 6,920 points • 1,676 views
0 votes
1 answer

What is the use of StringBuilder in java?

If you use String concatenation in a ...READ MORE

Jun 19, 2018 in Java by Akrati
 • 960 points • 1,541 views
0 votes
1 answer

What issues should be considered when we are overriding equals and hashCode in Java?

equals() must define an equivalent relation and ...READ MORE

Jun 21, 2018 in Java by Sushmita
 • 6,920 points • 1,449 views
0 votes
2 answers

How to read the files using Java?

You can use collections. try (Stream<Path> filePathStream=Files.walk(Paths.get("/home/you/Desktop"))) { ...READ MORE

Jul 10, 2018 in Java by Sushmita
 • 6,920 points • 1,968 views
0 votes
1 answer

Can we use multiline String in Java?

It is not possible directly to use Multiline ...READ MORE

Jun 19, 2018 in Java by sharth
 • 3,370 points • 1,530 views
0 votes
1 answer

using comparator for sorting in java

You've got two problems: 1) You're using Collections.sort (which takes ...READ MORE

Jul 6, 2018 in Java by samarth295
 • 2,220 points • 1,465 views
0 votes
2 answers

How to convert an array to arraylist?

In Java 9 you can use: List<String> list= List.of("Hello", "World", ...READ MORE

Aug 1, 2018 in Java by samarth295
 • 2,220 points • 1,939 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
 • 4,640 points • 2,277 views
0 votes
2 answers

Array of Objects

You can also do : A[] a = ...READ MORE

Aug 3, 2018 in Java by sharth
 • 3,370 points • 1,673 views
0 votes
1 answer

What do you mean by object serialization ?

To serialize an object means to convert its state ...READ MORE

Jun 14, 2018 in Java by scarlett
 • 1,290 points • 1,682 views
0 votes
1 answer

Eclipse Oxygen fails to start

I think you need to make some ...READ MORE

Jun 7, 2018 in Java by code.reaper12
 • 3,500 points • 1,987 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
 • 3,600 points • 2,358 views
+1 vote
1 answer

How can we resolve java.lang.OutOfMemoryError in Java?

Work with smaller batches of HashMap Objects ...READ MORE

Jun 5, 2018 in Java by sharth
 • 3,370 points • 1,964 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 • 2,635 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
 • 3,600 points • 2,482 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
 • 4,640 points • 2,148 views
0 votes
2 answers

How to test that an array contains a certain value?

public static final String[] VALUES = new ...READ MORE

Jul 17, 2018 in Java by Sushmita
 • 6,920 points • 2,061 views
0 votes
1 answer

How to kill a thread in Java?

You can use a shared variable as ...READ MORE

Jun 6, 2018 in Java by Akrati
 • 3,190 points • 1,898 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
 • 4,640 points • 2,435 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
 • 3,600 points • 2,054 views
0 votes
1 answer

What is ?: this operator called in java ? how dose it function?

? :  is the Conditional operator and is ...READ MORE

Jun 11, 2018 in Java by sophia
 • 1,400 points • 1,625 views
0 votes
1 answer

Why is char[] preferred over a string?

Strings are immutable. That means once you've ...READ MORE

Jun 14, 2018 in Java by scarlett
 • 1,290 points • 1,504 views
0 votes
1 answer

Following error is occurring "Can't start Eclipse - Java was started but returned exit code=13"

There are combinations of Operating System, JDK ...READ MORE

Apr 19, 2018 in Java by Rishabh
 • 3,600 points • 3,892 views
0 votes
1 answer

Why the main() method in Java is always static?

As you might know, static here is ...READ MORE

May 9, 2018 in Java by geek.erkami
 • 2,680 points • 3,038 views
0 votes
1 answer

What is abstract class in java?

A class that is declared with abstract ...READ MORE

Jun 11, 2018 in Java by Daisy
 • 8,140 points • 1,583 views
0 votes
1 answer

Serializable interface in Java

Serializable is a marker interface that has ...READ MORE

Jun 13, 2018 in Java by code.reaper12
 • 3,500 points • 1,493 views
0 votes
1 answer

Is it possible to run a java program from command line on windows?How?

  Let's say your file is in C:\myprogram\ Run ...READ MORE

Apr 18, 2018 in Java by sophia
 • 1,400 points • 3,876 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
 • 4,640 points • 2,146 views
0 votes
1 answer

Can quotes be added in a java string.how?

In Java, you can escape quotes with \: String ...READ MORE

Jun 14, 2018 in Java by Akrati
 • 960 points • 1,424 views
0 votes
1 answer

What is the difference == and equals() in Java?

Both the answers (Syntaxes) are correct. If ...READ MORE

Jun 5, 2018 in Java by Akrati
 • 3,190 points • 1,791 views
0 votes
1 answer

How to connect Java program to the MySQL database?

You can connect your Java code with ...READ MORE

May 11, 2018 in Java by Parth
 • 4,640 points • 2,870 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 • 2,006 views
0 votes
1 answer

How can we upload the files using JSP/ Servlets in Java?

<form action="upload" method="post" enctype="multipart/form-data"> ...READ MORE

Jun 8, 2018 in Java by Sushmita
 • 6,920 points • 1,614 views
0 votes
1 answer

Does a 32-bit byte code work in 64-bit JVM?

Yes, Java bytecode (and source code) is ...READ MORE

Jun 5, 2018 in Java by sophia
 • 1,400 points • 1,734 views
0 votes
1 answer

Sorting an ArrayList in Java

You can easily do this by simply ...READ MORE

May 5, 2018 in Java by geek.erkami
 • 2,680 points • 3,048 views
0 votes
1 answer

How to initialize multi-dimensional array in java?

A multidimensional array in Java is really an array ...READ MORE

Jun 6, 2018 in Java by sophia
 • 1,400 points • 1,620 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 • 2,513 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
 • 6,920 points • 1,893 views
0 votes
1 answer

Fixing java.lang.UnsupportedClassVersionError in Java

To fix the exception/ error, you should ...READ MORE

Jun 7, 2018 in Java by sharth
 • 3,370 points • 1,547 views
0 votes
1 answer

How to use pairs or 2-tuples in java?

You can refer the following code: public class ...READ MORE

Jun 7, 2018 in Java by Daisy
 • 8,140 points • 1,533 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 • 2,443 views
0 votes
1 answer

How can two strings be concatenated in java?

You can concatenate Strings using the + operator: System.out.println("Your number ...READ MORE

Jun 6, 2018 in Java by Daisy
 • 8,140 points • 1,522 views
0 votes
1 answer

What is the concept of Immutability for strings in Java ? Why are strings immutable ?

According to Effective Java, chapter 4, page 73, ...READ MORE

May 11, 2018 in Java by Rishabh
 • 3,600 points • 2,631 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 • 2,160 views
0 votes
1 answer

How can we nicely format a floating number into String by removing unnecessary zeros?

public static String fmt(double d) { if(d ...READ MORE

Jun 6, 2018 in Java by Parth
 • 4,640 points • 1,493 views
0 votes
1 answer

What are preparedstatements? How do they differ from statements?

Statement is used for static queries like ...READ MORE

Jun 8, 2018 in Java by Daisy
 • 8,140 points • 1,403 views
0 votes
1 answer

Java Static nested class

Hi, to understand their usage, you must ...READ MORE

Jun 8, 2018 in Java by v.liyyah
 • 1,300 points • 1,399 views
0 votes
1 answer

How can one day be added to a date?

One possible solution could be using calendar ...READ MORE

Jun 8, 2018 in Java by Daisy
 • 8,140 points • 1,283 views
0 votes
1 answer

How to fix the error failed to load the JNI shared Library?

You need these three things : 64-bit OS 64-bit ...READ MORE

Apr 19, 2018 in Java by sophia
 • 1,400 points • 3,427 views
0 votes
1 answer

What does Java option -Xmx stand for?

-Xmxn: It specifies the maximum size, in bytes, ...READ MORE

May 9, 2018 in Java by sharth
 • 3,370 points • 2,548 views
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