Trending questions in Java

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Sort a HashMap in Java

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

Jul 12, 2018 in Java by Daisy
• 8,110 points
189 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
• 6,890 points
375 views
0 votes
2 answers

How to concatenate two arrays in Java?

public <T> T[] concatenate(T[] a, T[] b) ...READ MORE

Jul 19, 2018 in Java by Sushmita
• 6,890 points
1,708 views
0 votes
3 answers

Adding text to a file using Java

try { final Path ...READ MORE

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

Multiple return statements in Java

Yes, you have guessed it right. Language ...READ MORE

Jun 27, 2018 in Java by geek.erkami
• 2,680 points
808 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
• 6,890 points
129 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
• 6,890 points
414 views
0 votes
1 answer

Examples of GoF Design Patterns in Java's core libraries

Observer pattern throughout whole swing (Observable, Observer) MVC also ...READ MORE

Jun 27, 2018 in Java by developer_1
• 3,310 points
786 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
• 2,220 points
1,733 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
• 3,170 points
85 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
116 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
• 6,890 points
403 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
• 6,890 points
396 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
• 3,640 points
996 views
0 votes
3 answers

How to check whether a string is empty or not? Is there a function for this?

str != null && str.length() != 0 alternatively str ...READ MORE

Sep 11, 2018 in Java by Sushmita
• 6,890 points
314 views
+4 votes
3 answers

What are the steps to set Java_home on Windows?

Set Java Home JAVA_HOME = C:\Program Files\Java\jdk1.7.0 [Location ...READ MORE

Sep 18, 2018 in Java by Sushmita
• 6,890 points
316 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
1,566 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
1,948 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
• 3,170 points
290 views
0 votes
1 answer

Annotation wiring in Spring

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

Jul 3, 2018 in Java by code.reaper12
• 3,500 points
401 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
• 2,220 points
1,014 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
• 3,640 points
345 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
• 3,170 points
900 views
0 votes
1 answer

Bean Scopes in Java Spring

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

Jul 3, 2018 in Java by geek.erkami
• 2,680 points
368 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
• 3,350 points
246 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
• 4,630 points
1,281 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
312 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
• 58,100 points
307 views
0 votes
2 answers

How may I programmatically determine operating system in Java?

Use the following program public class Osname {        public ...READ MORE

Jul 6, 2018 in Java by Priyaj
• 58,100 points
162 views
0 votes
0 answers

How to populate a ListView using an ArrayList?

I want to populate the data coming ...READ MORE

Jun 29, 2018 in Java by misc.edu04
• 1,440 points
522 views
0 votes
2 answers

Avoiding != null statements

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

Aug 20, 2018 in Java by Daisy
• 8,110 points
97 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
• 6,890 points
213 views
0 votes
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
769 views
0 votes
2 answers

Ho do I Iterate through a HashMap which contains duplicate values

for (Map.Entry<String, String> item : params.entrySet()) { ...READ MORE

Jul 24, 2018 in Java by samarth295
• 2,220 points
1,441 views
0 votes
1 answer

How to get the name of the currently executing method?

Thread.currentThread().getStackTrace() will usually contain the method you’re ...READ MORE

Jul 5, 2018 in Java by Daisy
• 8,110 points
136 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
• 4,630 points
719 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
• 3,170 points
770 views
0 votes
1 answer

How to get a platform-dependent new line character in Java?

If you are using Java 1.5 or ...READ MORE

Jul 3, 2018 in Java by Akrati
• 3,170 points
190 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
• 6,890 points
353 views
0 votes
1 answer

Measure time elapsed in Java?

This is also a way to work ...READ MORE

Jul 3, 2018 in Java by scarlett
• 1,270 points
151 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
206 views
0 votes
1 answer

NoClassDefFoundError in Java

Can’t tell you the exact reason as ...READ MORE

May 25, 2018 in Java by v.liyyah
• 1,300 points
1,834 views
0 votes
1 answer

Number of lines in a file in Java

I found this an efficient way in counting ...READ MORE

Jul 3, 2018 in Java by scarlett
• 1,270 points
132 views
0 votes
1 answer

Continue Keyword in Java

continue is kind of like goto. Are you familiar ...READ MORE

Jul 3, 2018 in Java by Rishabh
• 3,640 points
124 views
0 votes
1 answer

How to get the Generic type of class at run time?

public class GenericClass<T> { ...READ MORE

Jul 2, 2018 in Java by Akrati
• 3,170 points
137 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
• 1,270 points
652 views
0 votes
1 answer

Get parameters from the URL with JSP

To delete the subject record with its ...READ MORE

May 28, 2018 in Java by Parth
• 4,630 points
1,596 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
• 8,110 points
210 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
• 8,110 points
164 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
1,538 views