Trending questions in Java

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2 answers

What is the syntax to initialize an array?

Rather than learning un-Official websites learn from ...READ MORE

Aug 2, 2018 in Java by samarth295
 • 2,220 points • 1,897 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 • 1,353 views
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2 answers

Copying Objects in Java

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

Aug 6, 2018 in Java by Sushmita
 • 6,920 points • 1,571 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 • 1,362 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 • 1,839 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 • 1,860 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 • 1,419 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 • 2,177 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 • 1,600 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 • 1,578 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 • 1,868 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 • 2,211 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 • 1,838 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 • 2,038 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 • 2,364 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 • 2,508 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 • 1,946 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 • 1,781 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 • 2,310 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 • 1,519 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 • 1,934 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 • 1,384 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 • 3,769 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 • 1,465 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 • 1,391 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 • 2,893 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 • 1,320 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 • 2,757 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 • 2,022 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 • 1,672 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 • 1,523 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 • 3,721 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 • 1,634 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 • 1,861 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 • 2,952 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 • 1,525 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 • 2,406 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 • 1,446 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 • 1,431 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 • 1,770 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 • 1,425 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 • 2,336 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 • 1,401 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 • 2,514 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 • 2,037 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 • 1,310 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 • 1,287 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 • 1,194 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 • 3,325 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
 • 3,600 points • 1,811 views
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