Trending questions in Java

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Can I help with the gradle code for AspectJ?

You can go to maven repositories https://mvnrepository.com/artifact/org.aspectj/aspectjtools/1.9.2 ...READ MORE

Jan 8, 2019 in Java by Frankie
• 9,810 points
586 views
0 votes
2 answers

How can I solve java.lang.NoClassDefFoundError in Java?

NoClassDefFoundError means that the class is present ...READ MORE

Sep 11, 2018 in Java by Sushmita
• 6,890 points
8,212 views
0 votes
1 answer

Calling remove in foreach loop in Java

To safely remove from a collection while ...READ MORE

Sep 26, 2018 in Java by sharth
• 3,350 points
5,072 views
0 votes
1 answer

Where do we get the maven dependency code for Spring Beans?

Don't worry, you can just go through ...READ MORE

Jan 8, 2019 in Java by Frankie
• 9,810 points
539 views
0 votes
1 answer

Http Basic Authentication in Java using HttpClient?

String encoding = Base64Encoder.encode ("test1:test1"); HttpPost httppost = ...READ MORE

Dec 20, 2018 in Java by Daisy
• 8,110 points
1,373 views
0 votes
2 answers

Reserving space for a heap object

Run the JVM with -XX:MaxHeapSize=512m (or any big number ...READ MORE

Aug 26, 2019 in Java by Sirajul
• 59,050 points
330 views
0 votes
1 answer

Creating a JUnit Test Suite Class

To create a test suite we will use the ...READ MORE

Jan 17, 2019 in Java by Frankie
• 9,810 points
142 views
0 votes
1 answer

Sending Email in Android using JavaMail API without using the default/built-in app

Send e-mail in Android using the JavaMail ...READ MORE

Dec 4, 2018 in Java by Daisy
• 8,110 points
2,010 views
0 votes
1 answer

revalidate() vs repaint() in Java Swing

You need to call repaint() and revalidate() both in order ...READ MORE

Sep 19, 2018 in Java by code.reaper12
• 3,500 points
5,195 views
0 votes
1 answer

Ways to compare String Values

== compares object references, it checks to see ...READ MORE

Jan 14, 2019 in Java by developer_1
• 3,310 points
113 views
0 votes
1 answer

Exception Handling: “ConcurrentModificationException” while removing elements from `ArrayList` while iterating it

Iterator<String> iter = myArrayList.iterator(); while (iter.hasNext()) { ...READ MORE

Jan 10, 2019 in Java by Sushmita
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288 views
0 votes
2 answers

How can I convert an 'ArrayList<String> to 'String[]' in Java

In Java 8 or later: String listString = ...READ MORE

Aug 20, 2019 in Java by Sirajul
• 59,050 points
1,163 views
0 votes
1 answer

How to convert a date string to a DateTime object using Joda Time library?

DateTimeFormatter formatter = DateTimeFormat.forPattern("dd/MM/yyyy HH:mm:ss"); DateTime dt = ...READ MORE

Jan 9, 2019 in Java by Daisy
• 8,110 points
298 views
+2 votes
1 answer

How to import an existing x509 certificate and private key in Java keystore to use in SSL?

keytool does not provide such basic functionality ...READ MORE

Dec 19, 2018 in Java by Daisy
• 8,110 points
1,114 views
0 votes
1 answer

How to parse date string to Date?

The pattern is wrong. You have a ...READ MORE

Oct 29, 2018 in Java by Daisy
• 8,110 points
3,367 views
0 votes
1 answer

How can I run test methods in specific order in JUnit4?

@FixMethodOrder(MethodSorters.NAME_ASCENDING) public class SampleTest { ...READ MORE

Jan 7, 2019 in Java by Daisy
• 8,110 points
296 views
0 votes
0 answers

Can anyone explain Autowiring in Spring ?

Say I have a service class called UserServiceImpl that ...READ MORE

Jan 11, 2019 in Java by Sushmita
• 6,890 points
149 views
0 votes
1 answer

Unable to Run the .java file

You have to enter the commands as ...READ MORE

Jan 10, 2019 in Java by Omkar
• 69,110 points
125 views
0 votes
2 answers

How can I split the String with any whitespace character as delimiter?

String string = "Today's weather"; String[] arrayOfString = ...READ MORE

Aug 23, 2019 in Java by Sirajul
• 59,050 points
208 views
0 votes
1 answer

Where is JAVA_HOME on macOS Mojave (10.14) to Lion (10.7)?

export JAVA_HOME="$(/usr/libexec/java_home -v 1.6)" or export JAVA_HOME="$(/usr/libexec/java_home -v 1.7)" or export ...READ MORE

Dec 4, 2018 in Java by Daisy
• 8,110 points
1,689 views
+1 vote
2 answers

Is there a code to find 64-bit JVM or 32-bit JVM (from within a program)?

Do I need to understand the difference ...READ MORE

Jun 11, 2019 in Java by Jim
• 810 points
1,071 views
0 votes
2 answers

How to convert ArrayList<String> to String[] in Java

Try this:  String[] strArray = arrayList.toArray(new Str ...READ MORE

Aug 21, 2019 in Java by Sirajul
• 59,050 points
261 views
0 votes
1 answer

Comparing Functions in Java

I would suggest that Version 1 is ...READ MORE

Jan 9, 2019 in Java by developer_1
• 3,310 points
97 views
0 votes
1 answer

How can we override back button to act like home button?

Most of the time you need to ...READ MORE

Dec 14, 2018 in Java by Daisy
• 8,110 points
1,222 views
0 votes
1 answer

Java Client Certificate over HTTPS/SSL

The missing links was (mostly) the first ...READ MORE

Nov 28, 2018 in Java by Sushmita
• 6,890 points
1,908 views
0 votes
2 answers

What is the use of @Override annotation in Java ? When do we use it ?

@Override annotation is used when we override ...READ MORE

Aug 14, 2019 in Java by Sirajul
• 59,050 points
736 views
0 votes
2 answers

How do I replace character from string at specific indexes?

You could turn the String into a ...READ MORE

Aug 22, 2019 in Java by Sirajul
• 59,050 points
730 views
0 votes
2 answers

Get all the permutations of a string in Java

You could use recursion to do this.  Try ...READ MORE

Aug 21, 2019 in Java by Sirajul
• 59,050 points
400 views
0 votes
1 answer

Evaluating a math expression given in string form

import javax.script.ScriptEngineManager; import javax.script.ScriptEngine; import javax.script.ScriptException; public class Test { ...READ MORE

Oct 12, 2018 in Java by Daisy
• 8,110 points
3,855 views
0 votes
1 answer

How to specify the certificate to use for authenticating the server to client?

You can try the command given below. System.setProperty("javax.net ...READ MORE

Jan 2, 2019 in Java by Daisy
• 8,110 points
303 views
0 votes
1 answer

Including dependencies in a jar with Maven

You can do this using the maven-assembly-plugin ...READ MORE

Jul 20, 2018 in Java by samarth295
• 2,220 points
7,438 views
0 votes
1 answer

How to run Unix shell script from Java code?

ProcessBuilder pb = new ProcessBuilder("myshellScript.sh", "myArg1", "myArg2"); ...READ MORE

Oct 26, 2018 in Java by Daisy
• 8,110 points
3,175 views
0 votes
1 answer

What is the need to override the equals and hashCode methods in Java?

You must override hashCode() in every class ...READ MORE

Jan 2, 2019 in Java by Daisy
• 8,110 points
225 views
0 votes
2 answers

How can I invoke a method when the method name is in the form of a given string?

You could probably use method invocation from reflection: Class<?> ...READ MORE

Aug 19, 2019 in Java by Sirajul
• 59,050 points
618 views
0 votes
1 answer

How to determine day of week by passing specific date?

You can use java.util.Calendar: Calendar c = Calendar.getInstance(); c.setTime(yourDate); int dayOfWeek ...READ MORE

Oct 30, 2018 in Java by Daisy
• 8,110 points
2,937 views
0 votes
1 answer

How to Read/Write String from a File in Android

Writing a File in android: private void writeToFile(String ...READ MORE

Oct 3, 2018 in Java by sharth
• 3,350 points
4,066 views
0 votes
1 answer

Is there any difference between ConcurrentHashMap and Collections.synchronizedMap?

ConcurrentHashMap: It allows concurrent modification of the ...READ MORE

Dec 26, 2018 in Java by Sushmita
• 6,890 points
336 views
0 votes
2 answers

How can I convert a String variable to a primitive int in Java

 Here are two ways illustrating this: Integer x ...READ MORE

Aug 20, 2019 in Java by Sirajul
• 59,050 points
691 views
0 votes
1 answer

Difference between FetchType LAZY and EAGER in Java Persistence API?

Sometimes you have two entities and there's ...READ MORE

Dec 5, 2018 in Java by Daisy
• 8,110 points
1,182 views
0 votes
2 answers

How do I get the current date and time using Java?

If you require a time stamp in ...READ MORE

Aug 23, 2019 in Java by Sirajul
• 59,050 points
448 views
0 votes
2 answers

what is the best way to convert an ArrayList to a String

You could probably use the Joiner class ...READ MORE

Aug 19, 2019 in Java by Sirajul
• 59,050 points
253 views
+1 vote
2 answers

What is an Object?

Hey @preetiagarwal, your description is an answer ...READ MORE

Dec 24, 2018 in Java by Priyaj
• 58,100 points
117 views
0 votes
1 answer

Why doesn't RecyclerView have onItemClickListener()?

I like this way and I'm using ...READ MORE

Dec 21, 2018 in Java by Daisy
• 8,110 points
330 views
0 votes
2 answers

How can we add an image to a JPanel?

If you are using JPanels, then are ...READ MORE

Sep 20, 2018 in Java by Daisy
• 8,110 points
6,659 views
0 votes
2 answers

How to round any number to n decimal places in Java?

new BigDecimal(String.valueOf(double)).setScale(yourScale, BigDecimal.ROUND_HALF_UP); will get you a BigDecimal. To ...READ MORE

Aug 26, 2019 in Java by Sirajul
• 59,050 points
315 views
0 votes
1 answer

How to create a temporary directory/folder in java?

If you are using JDK 7 use ...READ MORE

Aug 28, 2018 in Java by Frankie
• 9,810 points
5,244 views
0 votes
1 answer

web.xml file is missing in my eclipse IDE

Very simple. You will find Deployment Descriptor ...READ MORE

Nov 27, 2018 in Java by Omkar
• 69,110 points
1,271 views
0 votes
1 answer

Static Map initialization in Java

I would suggest you to use the ...READ MORE

May 4, 2018 in Java by Akrati
• 3,170 points
10,149 views
+2 votes
1 answer

How do I ask the Selenium-WebDriver to wait for few seconds in Java?

There are two ways to wait: explicit ...READ MORE

Dec 19, 2018 in Java by Daisy
• 8,110 points

edited Dec 19, 2018 by Daisy 174 views
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1 answer

Why clone() method is protected in Java?

The clone() is protected because it is ...READ MORE

Nov 12, 2018 in Java by geek.erkami
• 2,680 points
1,816 views