Trending questions in Java

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ThreadLocal variables usage in Java

public class Test { // ...READ MORE

Jun 29, 2018 in Java by code.reaper12
• 3,500 points
163 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
1,458 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
• 1,270 points
210 views
0 votes
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
185 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
• 1,270 points
274 views
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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
557 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
235 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
• 3,640 points
121 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
• 3,170 points
233 views
0 votes
1 answer

While using next() or nextfoo() , the upcoming nextLine() is skipped by scanner

That's because the Scanner.nextInt method does not ...READ MORE

Jun 6, 2018 in Java by mitto
• 160 points
1,095 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
• 8,110 points
1,187 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
• 2,220 points
217 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
631 views
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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
94 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
542 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
492 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
311 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
448 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
• 8,110 points
354 views
+1 vote
1 answer

concat() vs “+” operator : In Java for String concatenation

Basically, there are two important differences between ...READ MORE

Apr 27, 2018 in Java by Rishabh
• 3,640 points
2,652 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
• 3,170 points
306 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
• 3,350 points
131 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
• 3,640 points
668 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
207 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
209 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
594 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
891 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
• 3,170 points
977 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
878 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
• 3,640 points
234 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
• 3,350 points
117 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
• 2,220 points
299 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
• 1,270 points
313 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
196 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
• 8,110 points
1,073 views
0 votes
1 answer

How can we remove html tags from a string?

You can use HTML parser. This is ...READ MORE

Jun 4, 2018 in Java by sophia
• 1,400 points
889 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
220 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
133 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
• 3,350 points
221 views
0 votes
1 answer

How to stop the Thread in Java?

Use a flag, which will indicate the ...READ MORE

Jun 11, 2018 in Java by Parth
• 4,630 points
506 views
0 votes
1 answer

Generating an MD5 hash?

The MessageDigest class can provide you with an instance ...READ MORE

Jun 13, 2018 in Java by Rishabh
• 3,640 points
401 views
0 votes
1 answer

Formatting Double Value in Java

An alternative is to use String.format: double[] arr = ...READ MORE

May 15, 2018 in Java by Rishabh
• 3,640 points
1,650 views
0 votes
2 answers

How to convert array into list in Java?

Another workaround if you use apache commons-lang: int[] ...READ MORE

Aug 9, 2018 in Java by samarth295
• 2,220 points
194 views
0 votes
1 answer

How to fire and handle HTTP requests

There are 2 options you can go ...READ MORE

Jun 13, 2018 in Java by Rishabh
• 3,640 points
316 views
0 votes
1 answer

In Java, how to find out the min/max values from array of primitive data types?

import java.util.Arrays; import java.util.Collections; import org.apache.commons.lang.ArrayUtils; public class MinMaxValue { ...READ MORE

Jun 12, 2018 in Java by Daisy
• 8,110 points
368 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 27, 2018 in Java by samarth295
• 2,220 points
526 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
• 1,270 points
259 views
0 votes
2 answers

How can I create File and write data in it using Java?

import java.io.BufferedWriter; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; public class WriteFiles{ ...READ MORE

Jul 26, 2018 in Java by samarth295
• 2,220 points
558 views
0 votes
1 answer

How to getters and setters work in java

In Java, getter and setter are two ...READ MORE

Jun 1, 2018 in Java by Daisy
• 8,110 points
777 views
0 votes
2 answers

Array of Objects

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

Aug 3, 2018 in Java by sharth
• 3,350 points
182 views