Trending questions in Java

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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 • 3,201 views
0 votes
3 answers

String to Double conversion in java

Double temp = Double.valueOf(str); number = temp.doubleValue(); READ MORE

Sep 10, 2018 in Java by Sushmita
 • 6,920 points • 1,888 views
0 votes
4 answers

How can we compare dates in java?

public static String daysBetween(String day1, String day2) ...READ MORE

Sep 5, 2018 in Java by Sushmita
 • 6,920 points • 1,615 views
0 votes
1 answer

Difference between JSF, Servlet and JSP?

Servlet - it's java server side layer. JSP ...READ MORE

Jul 3, 2018 in Java by samarth295
 • 2,220 points • 1,702 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 • 1,246 views
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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 • 1,293 views
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2 answers

Generate an alpha-numeric string randomly

Java supplies a way of doing this ...READ MORE

Jul 18, 2018 in Java by Daisy
 • 8,140 points • 2,881 views
0 votes
3 answers

How to read a Text File in Java?

You can use readAllLines and the join method to ...READ MORE

Jul 28, 2018 in Java by samarth295
 • 2,220 points • 2,682 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 • 861 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 • 1,442 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
 • 3,620 points • 2,083 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 • 955 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 • 2,463 views
0 votes
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 • 1,132 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 • 1,278 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 • 3,554 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 • 1,157 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 • 785 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
 • 3,620 points • 1,424 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 • 1,929 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 • 1,350 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 • 1,401 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 • 1,319 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 • 1,285 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 • 1,971 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 • 2,790 views
0 votes
1 answer

What is the native keyword in Java?

The native keyword is applied to a method to ...READ MORE

Jul 16, 2018 in Java by scarlett
 • 1,290 points • 716 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 • 873 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 • 1,129 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 • 1,076 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 • 1,033 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 • 1,755 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
 • 3,620 points • 2,138 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 • 1,514 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 • 1,735 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
 • 3,620 points • 1,167 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 • 1,130 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 • 1,125 views
0 votes
1 answer

What is the array initialization syntax when not in a declaration?

Probably you'd have to ask the Java ...READ MORE

Jul 13, 2018 in Java by Akrati
 • 3,190 points • 753 views
0 votes
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 • 1,753 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 • 2,401 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
 • 2,887 views
0 votes
1 answer

Sort a HashMap in Java

Convert hashmap to an ArrayList with a ...READ MORE

Jul 13, 2018 in Java by Daisy
 • 8,140 points • 731 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 • 1,851 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 • 1,661 views
0 votes
1 answer

java.lang.UnsupportedClassVersionError: Bad version number in .class file. How to solve this?

I've learned that error messages like this ...READ MORE

Jul 4, 2018 in Java by Annie
 • 240 points • 1,010 views
0 votes
1 answer

Is there any way to write content of Java InputStream to an OutputStream?

org.apache.commons.io.IOUtils from Apache has a method called copy(InputStream,OutputStream).which does ...READ MORE

Jul 6, 2018 in Java by sharth
 • 3,370 points • 910 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 • 1,289 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 • 1,876 views
0 votes
1 answer

how to play sound in java?

 The following code will work fine. But I ...READ MORE

Jun 20, 2018 in Java by scarlett
 • 1,290 points • 1,568 views
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