Trending questions in Java

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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
67 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
• 3,580 points
1,475 views
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2 answers

Does the finally block always execute in Java?

public static void main(String[] args) { ...READ MORE

Aug 8, 2018 in Java by Sushmita
• 6,890 points
504 views
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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
• 3,150 points
548 views
0 votes
1 answer

What is Classpath in java?

Classpath is a parameter in the Java virtual machine or ...READ MORE

Jun 5, 2018 in Java by Daisy
• 8,090 points
1,174 views
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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
• 6,890 points
135 views
0 votes
1 answer

What are Daemon threads in Java?

A daemon thread is a thread that is doing ...READ MORE

Jun 29, 2018 in Java by Daisy
• 8,090 points
131 views
+1 vote
1 answer

What is the difference between JavaScript and Java

This quote rightly explains that 2 totally ...READ MORE

Jun 29, 2018 in Java by Daisy
• 8,090 points
91 views
0 votes
1 answer

ThreadLocal variables usage in Java

public class Test { // ...READ MORE

Jun 29, 2018 in Java by code.reaper12
• 3,470 points
93 views
0 votes
1 answer

What is the difference between hashset and treeset?

HashSet vs TreeSet: 1- Hashset gives better performance (faster) ...READ MORE

Jun 20, 2018 in Java by Akrati
• 3,150 points
489 views
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1 answer

Programmatically closing a JFrame

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

Jun 21, 2018 in Java by Parth
• 4,630 points
437 views
+1 vote
1 answer

What if several ports required by tomacat server at local host are already in use

You've another instance of Tomcat already running. ...READ MORE

May 31, 2018 in Java by Akrati
• 3,150 points
1,292 views
0 votes
1 answer

What is the use of assert keyword in java?

Java assertion feature allows the developer to ...READ MORE

Jun 28, 2018 in Java by scarlett
• 1,280 points
119 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
• 3,580 points
420 views
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2 answers

How to get input from user using System.console()?

Scanner in = new Scanner(System.in); int i = ...READ MORE

Aug 2, 2018 in Java by Sushmita
• 6,890 points
100 views
0 votes
1 answer

How to configure Android SDK for finding JDK

Actual SETUP: OS: Windows 8.1 JDK file: jdk-8u11-windows-x64.exe ADT file: ...READ MORE

Jun 29, 2018 in Java by Rishabh
• 3,580 points
68 views
0 votes
1 answer

@Component vs @Repository vs @Service in Spring Framework

As you might be knowing, all these ...READ MORE

May 29, 2018 in Java by geek.erkami
• 2,680 points
1,390 views
0 votes
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
• 1,280 points
147 views
0 votes
1 answer

How can we import javax.servlet API in Eclipse?

Before installing Eclipse, ensure that you are ...READ MORE

Jun 7, 2018 in Java by Parth
• 4,630 points
981 views
0 votes
1 answer

Which Java GUI framework we should refer?

If you are working on Desktop Application, ...READ MORE

Jun 19, 2018 in Java by Parth
• 4,630 points
455 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
• 6,890 points
131 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
• 3,150 points
132 views
0 votes
1 answer

How can we use java property files?

You can refer the below code: Properties properties ...READ MORE

Jun 28, 2018 in Java by Akrati
• 960 points
46 views
0 votes
1 answer

Can a static reference be made to a non-static method

setLoanItem() isn't a static method, it's an instance ...READ MORE

Jun 26, 2018 in Java by samarth295
• 2,190 points
132 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
• 1,280 points
373 views
0 votes
1 answer

How to get the IP address of the machine using Java?

One approach is to use NetworkInterface.getNetworkInterfaces() to get all ...READ MORE

Jun 25, 2018 in Java by sharth
• 3,370 points
66 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
• 4,630 points
176 views
0 votes
1 answer

Is it possible to create a memory leak with Java

Here's a good way to create a memory ...READ MORE

May 30, 2018 in Java by Parth
• 4,630 points
1,170 views
0 votes
1 answer

Remotely debugging JVM using Java command line

In order to use JAVA_OPT you need ...READ MORE

Jun 18, 2018 in Java by 93.lynn
• 1,620 points
348 views
0 votes
1 answer

Default Constructor in Java

Well, none of these is the default ...READ MORE

Jun 18, 2018 in Java by geek.erkami
• 2,680 points
347 views
0 votes
2 answers

One line initialization of an ArrayList object in Java

In Java 8 or earlier: List<String> string = ...READ MORE

Jul 26, 2018 in Java by samarth295
• 2,190 points
913 views
0 votes
2 answers

Date format conversion in Java

Calendar cal = Calendar.getInstance(); cal.add(Calendar.DATE, 1); Date date = ...READ MORE

Aug 13, 2018 in Java by Sushmita
• 6,890 points
116 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
• 4,630 points
117 views
0 votes
1 answer

How to convert s Stack trace to a String?

One can use the given method to ...READ MORE

Jun 25, 2018 in Java by sharth
• 3,370 points
65 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
• 2,190 points
386 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
• 6,890 points
303 views
0 votes
2 answers

When to use Static Methods in Java?

A static method has two main purposes: For ...READ MORE

Aug 9, 2018 in Java by samarth295
• 2,190 points
212 views
0 votes
1 answer

Access restriction on class error

My guess is that you are trying ...READ MORE

Jun 21, 2018 in Java by Rishabh
• 3,580 points
127 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
• 8,090 points
150 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
• 3,470 points
1,097 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
• 2,190 points
127 views
0 votes
3 answers

How to reverse a string in java?

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

Aug 16, 2018 in Java by samarth295
• 2,190 points
184 views
0 votes
1 answer

what do you mean by static block in java?

Static block is used for initializing the ...READ MORE

Jun 18, 2018 in Java by scarlett
• 1,280 points
216 views
0 votes
1 answer

To use JavaMail API for sending mails in Android without using the default/built-in App

ADD 3 jars found in the following ...READ MORE

Jun 6, 2018 in Java by sridhar
• 160 points
728 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
• 6,890 points
67 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
150 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
• 3,150 points
57 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
135 views
0 votes
1 answer

Exception coming "android.os.NetworkOnMainThreadException"

This exception is thrown when an application ...READ MORE

Jun 6, 2018 in Java by poorvi
• 160 points
694 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
• 6,890 points
372 views