Trending questions in Java

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Why there is the need of getters and setters in java

In Java getters and setters are completely ...READ MORE

Jun 26, 2018 in Java by scarlett
 • 1,290 points • 3,433 views
0 votes
1 answer

Behavior of Integer Wrapper class and == operator

Well, this is happening because of the ...READ MORE

Jun 7, 2018 in Java by v.liyyah
 • 1,300 points • 4,231 views
0 votes
1 answer

How to use wait() and notify() concept in producer consumer situation

In this program, we have two threads ...READ MORE

Jul 20, 2018 in Java by Kalgi
 • 52,340 points • 2,302 views
0 votes
2 answers

Does Java allow to create static classes?

Java has "static nested classes", but they ...READ MORE

Sep 5, 2018 in Java by Sushmita
 • 6,920 points • 2,607 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 • 5,003 views
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3 answers

How to reverse a string in java?

public static String reverse(String s) { ...READ MORE

Aug 17, 2018 in Java by samarth295
 • 2,220 points • 3,576 views
0 votes
2 answers

What is the difference between = and equals()?

The equals() method compares the "value" inside String instances ...READ MORE

Aug 13, 2018 in Java by Daisy
 • 8,140 points • 3,517 views
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2 answers

How does '&&' (AND) and '||' (OR) statements work inside an IF condition ?

Short circuit here means that the second ...READ MORE

Sep 19, 2018 in Java by Sushmita
 • 6,920 points • 2,554 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
 • 3,600 points • 4,409 views
0 votes
2 answers

How to round up a value to 2 decimal places?

double d = 2.34568; DecimalFormat f = new ...READ MORE

Aug 30, 2018 in Java by Sushmita
 • 6,920 points • 2,818 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 • 4,899 views
0 votes
1 answer

How can we run the .jar file by double clicking on windows 7 (64)?

Use the following method to run the ...READ MORE

Jun 28, 2018 in Java by sharth
 • 3,370 points • 3,067 views
0 votes
2 answers

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

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

May 24, 2018 in Java by UshaK
 • 4,540 views
–1 vote
1 answer

What is the difference between oracle JDK and open JDK

Both OpenJDK and Oracle JDK are created ...READ MORE

Jul 10, 2018 in Java by Akrati
 • 3,190 points • 2,529 views
0 votes
2 answers

When and how to use Super() keyword in Java?

super() is used to call immediate parent. super() can be ...READ MORE

Jul 9, 2018 in Java by Sushmita
 • 6,920 points • 3,420 views
0 votes
1 answer

What is casting variable in java?

Casting is, taking an Object of one ...READ MORE

Jul 17, 2018 in Java by scarlett
 • 1,290 points • 2,097 views
0 votes
1 answer

How can we split a comma separated String in Java?

String str = "..."; // write the ...READ MORE

Jun 12, 2018 in Java by Parth
 • 4,640 points • 3,583 views
0 votes
1 answer

What is the use of serialVersionUID ?

The docs for java.io.Serializable are probably about as good ...READ MORE

Jun 21, 2018 in Java by Rishabh
 • 3,600 points • 3,186 views
0 votes
1 answer

How to resolve the java.net.ConnectException in Java?

If you are getting java.net.ConnectionException, it means ...READ MORE

Jun 4, 2018 in Java by Akrati
 • 3,190 points • 3,917 views
0 votes
2 answers

Explain the functionality of Math.random() method.

You can use java.util.Random class. int myNumber = ...READ MORE

Aug 3, 2018 in Java by Sushmita
 • 6,920 points • 2,935 views
0 votes
1 answer

What is the difference between static and inner class?

An inner class, cannot be static, so ...READ MORE

Jul 11, 2018 in Java by sophia
 • 1,400 points • 2,275 views
0 votes
1 answer

How can we format float to n decimal places ?

You may pass the float value: String.format("%.2f", floatVal); READ MORE

Jul 2, 2018 in Java by sophia
 • 1,400 points • 2,640 views
0 votes
1 answer

What's the difference between SoftReference and WeakReference in Java?

Weak references A weak reference, simply put, is a ...READ MORE

Jun 12, 2018 in Java by Rishabh
 • 3,600 points • 3,486 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
 • 8,140 points • 3,992 views
0 votes
1 answer

Hibernate show real SQL

If you want to see the SQL ...READ MORE

Jul 5, 2018 in Java by Sushmita
 • 6,920 points • 2,471 views
0 votes
1 answer

Iterating through a Collection, avoiding ConcurrentModificationException when removing in loop

You can either use the iterator directly ...READ MORE

Jul 3, 2018 in Java by Rishabh
 • 3,600 points • 2,545 views
+1 vote
1 answer

Remove objects from an array in Java?

We can use external libraries: org.apache.commons.lang.ArrayUtils.remove(java.lang.Object[] array, int ...READ MORE

Jun 26, 2018 in Java by scarlett
 • 1,290 points • 2,796 views
0 votes
1 answer

Running Command Line in Java

You may refer this: Runtime rt = Runtime.getRuntime(); Process ...READ MORE

Jul 20, 2018 in Java by Akrati
 • 960 points • 1,811 views
0 votes
1 answer

Check whether the string is palindrome or not?

You may refer the below code: public static ...READ MORE

Jul 11, 2018 in Java by Akrati
 • 3,190 points • 2,196 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 • 4,045 views
0 votes
2 answers

Is there a destructor in Java?

try (BufferedReader br = new BufferedReader(new FileReader(path))) ...READ MORE

Sep 4, 2018 in Java by Sushmita
 • 6,920 points • 2,313 views
0 votes
1 answer

Bean Scopes in Java Spring

According to my knowledge, the Spring Framework ...READ MORE

Jul 4, 2018 in Java by geek.erkami
 • 2,680 points • 2,501 views
0 votes
2 answers

How to call one constructor from another in Java?

public class Cons { public static Cons ...READ MORE

Jul 24, 2018 in Java by Akrati
 • 3,190 points • 3,073 views
0 votes
1 answer

How can we convert Strings to and from UTF8 byte arrays?

To convert STring to byte[]: String s = ...READ MORE

Jun 21, 2018 in Java by Akrati
 • 3,190 points • 3,021 views
0 votes
2 answers

Send HTTP request in Java

import com.google.api.client.http.GenericUrl; import com.google.api.client.http.HttpRequest; import com.google.api.client.http.HttpResponse; import com.google.api.client.http.HttpTransport; import com.google.api.client.http.javanet.NetHttpTransport; import java.io.IOException; import ...READ MORE

Aug 3, 2018 in Java by samarth295
 • 2,220 points • 3,238 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
 • 3,600 points • 4,623 views
0 votes
1 answer

What is the equivalent of the C++ Pair<L,R> in Java?

In a thread on comp.lang.java.help, Hunter Gratzner ...READ MORE

Jul 4, 2018 in Java by Rishabh
 • 3,600 points • 2,402 views
0 votes
2 answers

Remove duplicate elements from an ArrayList in Java

List<String> al = new ArrayList<>(); // add elements ...READ MORE

Jul 26, 2018 in Java by Sushmita
 • 6,920 points • 3,290 views
0 votes
1 answer

What are the practical uses for AtomicInteger?

There are two main uses of AtomicInteger: As an ...READ MORE

Jul 18, 2018 in Java by Akrati
 • 960 points • 1,781 views
0 votes
2 answers

How to read a text file in Java?

You can use Scanner class to read ...READ MORE

Aug 9, 2018 in Java by Parth
 • 4,640 points • 2,896 views
+1 vote
3 answers

How to convert a List to an Array in Java?

Either: Foo[] array = list.toArray(new Foo[list.size()]); or: Foo[] array = ...READ MORE

Aug 7, 2018 in Java by Akrati
 • 3,190 points • 2,712 views
0 votes
3 answers

How to sort an array in java?

import java.util.Arrays; public class Sort { ...READ MORE

Aug 24, 2018 in Java by Parth
 • 4,640 points • 2,868 views
0 votes
2 answers

Avoiding != null statements

public String getPostcode(Person person) { ...READ MORE

Aug 20, 2018 in Java by Daisy
 • 8,140 points • 2,228 views
0 votes
1 answer

Annotation wiring in Spring

By default, Annotation wiring is not turned ...READ MORE

Jul 4, 2018 in Java by code.reaper12
 • 3,500 points • 2,388 views
0 votes
2 answers

How to sort array in descending order

there are some traditional ways that you ...READ MORE

Jul 4, 2018 in Java by Priyaj
 • 58,020 points • 2,327 views
0 votes
1 answer

How to perform Java 256 bit AES Password Based Encryption?

/* Derive the key, given password and ...READ MORE

Jun 21, 2018 in Java by Akrati
 • 3,190 points • 2,884 views
0 votes
1 answer

What is an efficient way to implement a singleton pattern in Java?

Use an enum: public enum Foo { ...READ MORE

Jul 6, 2018 in Java by Akrati
 • 3,190 points • 2,213 views
0 votes
2 answers

Understand working of String Builder and String Buffer

Basically, StringBuffer methods are synchronized while StringBuilder ...READ MORE

Aug 29, 2018 in Java by Sushmita
 • 6,920 points • 2,238 views
0 votes
1 answer

Programmatically closing a JFrame

If you want the GUI to behave ...READ MORE

Jun 21, 2018 in Java by Parth
 • 4,640 points • 2,821 views
0 votes
1 answer

How can we use wait and notify in Java?

You can refer to this: synchronized (someObject) { ...READ MORE

Jul 12, 2018 in Java by sophia
 • 1,400 points • 1,920 views
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