Trending questions in Java

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Array of Objects

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

Aug 3, 2018 in Java by sharth
• 3,350 points
182 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
• 3,350 points
1,403 views
0 votes
2 answers

Copying Objects in Java

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

Aug 6, 2018 in Java by Sushmita
• 6,890 points
108 views
0 votes
1 answer

Is Java “pass-by-reference” or “pass-by-value”?

Think of reference parameters as being aliases ...READ MORE

Jun 8, 2018 in Java by Rishabh
• 3,640 points
440 views
0 votes
3 answers

Convert date object to a String

We parse the full date to time ...READ MORE

Jul 30, 2018 in Java by samarth295
• 2,220 points
297 views
0 votes
1 answer

Serializable interface in Java

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

Jun 12, 2018 in Java by code.reaper12
• 3,500 points
241 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
718 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
• 8,110 points
281 views
0 votes
2 answers

How can we remove an element from an array in Java?

You can use ArrayUtils class remove method which ...READ MORE

May 24, 2018 in Java by UshaK
1,075 views
0 votes
2 answers

How to find out current working directory in Java?

You can also use java.nio.file.Path and java.nio.file.Paths. Path ...READ MORE

Jul 30, 2018 in Java by Sushmita
• 6,890 points
178 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
• 3,170 points
484 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
• 1,270 points
133 views
0 votes
2 answers

Store String inside a File using Java

We can use Apache Commons IO. It ...READ MORE

Jul 20, 2018 in Java by Sushmita
• 6,890 points
179 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
108 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
• 6,890 points
300 views
0 votes
1 answer

How to read text files from the Classpath in Java?

InputStream in = this.getClass().getClassLoader().getResourceAsStream("TextFile.txt"); InputStream in = this.getClass().getResourceAsStream("/TextFile.txt"); package ...READ MORE

May 8, 2018 in Java by Akrati
• 3,170 points
1,631 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
366 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
• 6,890 points
245 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
• 3,350 points
329 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
556 views
+1 vote
2 answers

How to generate random integers within specific range in Java?

You can achieve that concisely in Java: Random ...READ MORE

Jul 25, 2018 in Java by samarth295
• 2,220 points
357 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
179 views
0 votes
1 answer

How to calculate method execution time in Java ?

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

May 24, 2018 in Java by Rishabh
• 3,640 points
859 views
0 votes
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
194 views
0 votes
2 answers

Integer to String conversion in java

We can do this in 2 ways: String ...READ MORE

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

Eclipse Oxygen fails to start

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

Jun 6, 2018 in Java by code.reaper12
• 3,500 points
238 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
• 3,350 points
253 views
0 votes
1 answer

Java Static nested class

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

Jun 7, 2018 in Java by v.liyyah
• 1,300 points
164 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
• 8,110 points
121 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
252 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
767 views
0 votes
1 answer

What are preparedstatements? How do they differ from statements?

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

Jun 7, 2018 in Java by Daisy
• 8,110 points
144 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
• 8,110 points
146 views
0 votes
2 answers

I'm getting following error, while i'm running code in windows xp service pack 3 with JDK 6 version.

Till you send the code, I would ...READ MORE

May 16, 2018 in Java by Meci Matt
• 9,460 points
1,043 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
• 3,170 points
191 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
• 8,110 points
113 views
0 votes
1 answer

How can we get file extension in Java?

To get the file extension, we can ...READ MORE

May 8, 2018 in Java by Parth
• 4,630 points
1,376 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
• 4,630 points
108 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
• 3,640 points
309 views
0 votes
1 answer

How to clone ArrayList and also clone its contents?

Iterate on the items, and clone them ...READ MORE

Jun 4, 2018 in Java by Akrati
• 3,170 points
126 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
• 3,350 points
336 views
0 votes
1 answer

How does omitting curly braces in Java program, effect the code ?

Using braces makes the code more maintainable ...READ MORE

May 14, 2018 in Java by Rishabh
• 3,640 points
1,013 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
• 6,890 points
172 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
• 3,640 points
2,075 views
0 votes
2 answers

How to create a 2-D array in java?

int[][] multi = new int[5][]; multi[0] = new ...READ MORE

Jul 16, 2018 in Java by Daisy
• 8,110 points
264 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
• 3,170 points
687 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
80 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
365 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
• 6,890 points
265 views
0 votes
1 answer

How to retrieve current stack trace?

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

May 16, 2018 in Java by code.reaper12
• 3,500 points
817 views