Most answered questions in Java

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1 answer

How to read and write on an excel files?

Follow these steps: Write: public class User { ...READ MORE

May 15, 2018 in Java by Rishabh
 • 3,620 points • 1,904 views
0 votes
1 answer

How does omitting curly braces in Java program, effect the code ?

Using braces makes the code more maintainable ...READ MORE

May 14, 2018 in Java by Rishabh
 • 3,620 points • 3,472 views
0 votes
1 answer

What is Java Enterprise Edition ?

Is Java EE just a specification? What ...READ MORE

May 14, 2018 in Java by Rishabh
 • 3,620 points • 1,222 views
0 votes
1 answer

How to get the number of digits in an int?

You can find out the length of ...READ MORE

May 14, 2018 in Java by Akrati
 • 3,190 points • 1,385 views
0 votes
1 answer

What is the concept of Immutability for strings in Java ? Why are strings immutable ?

According to Effective Java, chapter 4, page 73, ...READ MORE

May 11, 2018 in Java by Rishabh
 • 3,620 points • 2,100 views
0 votes
1 answer

How to reverse an int array in Java?

for(int i = 0; i < Data.length ...READ MORE

May 11, 2018 in Java by Akrati
 • 3,190 points • 1,318 views
0 votes
1 answer

Can Abstract Class have a Constructor?

Yes, an abstract class can have a ...READ MORE

May 11, 2018 in Java by sharth
 • 3,370 points • 1,580 views
0 votes
1 answer

What is ArrayIndexOutOfBoundsException ?

If You check System.out.print(names.length); you will get 3 ...READ MORE

May 11, 2018 in Java by sharth
 • 3,370 points • 1,451 views
0 votes
1 answer

How to connect Java program to the MySQL database?

You can connect your Java code with ...READ MORE

May 11, 2018 in Java by Parth
 • 4,640 points • 2,374 views
0 votes
1 answer

Comparable vs Comparator in Java

I think you are not alone who is ...READ MORE

May 11, 2018 in Java by code.reaper12
 • 3,500 points • 1,435 views
0 votes
1 answer

How do I join 2 lists

This is not a simpler method, but ...READ MORE

May 11, 2018 in Java by sharth
 • 3,370 points • 1,149 views
+1 vote
1 answer

Are arrays equivalent to objects in Java ?

Yes; the Java Language Specification writes: In the Java ...READ MORE

May 10, 2018 in Java by Rishabh
 • 3,620 points • 1,783 views
0 votes
1 answer

Play MP3 files usng Java API

I don't believe the java AudioStream class ...READ MORE

May 10, 2018 in Java by Rishabh
 • 3,620 points • 9,857 views
0 votes
1 answer

Converting String and Float Data-types

Using Java’s Float class. float f = Float.parseFloat("25"); String s = ...READ MORE

May 9, 2018 in Java by developer_1
 • 3,350 points • 1,252 views
0 votes
1 answer

What does Java option -Xmx stand for?

-Xmxn: It specifies the maximum size, in bytes, ...READ MORE

May 9, 2018 in Java by sharth
 • 3,370 points • 2,159 views
0 votes
1 answer

Why the main() method in Java is always static?

As you might know, static here is ...READ MORE

May 9, 2018 in Java by geek.erkami
 • 2,680 points • 2,567 views
0 votes
1 answer

Need for finalize() in Java

finalize() is a method called by the ...READ MORE

May 9, 2018 in Java by code.reaper12
 • 3,500 points • 1,046 views
0 votes
1 answer

Implement Tree(Datastructure) in Java

I wrote a small "TreeMap" class based ...READ MORE

May 9, 2018 in Java by sharth
 • 3,370 points • 1,836 views
0 votes
1 answer

Perform "Switch-case" on String in Java

Switches based on integers can be optimized ...READ MORE

May 8, 2018 in Java by Rishabh
 • 3,620 points • 1,303 views
0 votes
1 answer

In which class is the "length" property of array defined ?

It's defined in the Java language specification: The members ...READ MORE

May 8, 2018 in Java by Rishabh
 • 3,620 points • 1,605 views
0 votes
1 answer

Convert String type to byte[] in Java

Try using String.getBytes(). It returns a byte[] ...READ MORE

May 8, 2018 in Java by Rishabh
 • 3,620 points • 1,184 views
0 votes
1 answer

How to read text files from the Classpath in Java?

InputStream in = this.getClass().getClassLoader().getResourceAsStream("TextFile.txt"); InputStream in = this.getClass().getResourceAsStream("/TextFile.txt"); package ...READ MORE

May 8, 2018 in Java by Akrati
 • 3,190 points • 3,258 views
0 votes
1 answer

How can we get file extension in Java?

In Java, you can find the file ...READ MORE

Apr 3, 2024 in Java by kevin
edited Mar 5 • 3,575 views
0 votes
1 answer

Difference between String.equals() and ==

Though both are used for comparison, but the ...READ MORE

May 7, 2018 in Java by geek.erkami
 • 2,680 points • 1,276 views
0 votes
1 answer

Purpose of “String args[]” in the “psvm” of Java

Let me give you the complete explanation ...READ MORE

May 7, 2018 in Java by code.reaper12
 • 3,500 points • 5,180 views
0 votes
1 answer

Sorting an ArrayList in Java

You can easily do this by simply ...READ MORE

May 5, 2018 in Java by geek.erkami
 • 2,680 points • 2,624 views
0 votes
1 answer

HashMap vs LinkedHashMap vs TreeMap

Hi, there is no as such difference ...READ MORE

May 5, 2018 in Java by v.liyyah
 • 1,300 points • 1,829 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
 • 3,190 points • 13,450 views
0 votes
1 answer

How to calculate the difference between two date instances in Java?

You can use Joda Time Library. Interval i ...READ MORE

May 4, 2018 in Java by Parth
 • 4,640 points • 1,392 views
0 votes
1 answer

Reflection: Explanation and Uses

Reflection API is used to modify or examine the behavior ...READ MORE

May 2, 2018 in Java by sharth
 • 3,370 points • 1,079 views
0 votes
1 answer

How can I read a large text file line by line using Java?

// Open the file FileInputStream file = new ...READ MORE

May 2, 2018 in Java by Parth
 • 4,640 points • 1,269 views
0 votes
1 answer

How to pad string in Java?

Padding to 10 characters: String.format("%10s", "foo").replace(' ', '*'); String.format("%-10s", ...READ MORE

May 1, 2018 in Java by Rishabh
 • 3,620 points • 1,461 views
0 votes
1 answer

What is the difference between Runnable and extends Thread

Runnable is the preferred way to create ...READ MORE

May 1, 2018 in Java by sharth
 • 3,370 points • 1,646 views
0 votes
1 answer

What do we understand from string pool in java?

This prints true (even though we don't use equals method: correct ...READ MORE

Apr 30, 2018 in Java by Daisy
 • 8,140 points • 1,167 views
0 votes
1 answer

Can Static methods be inherited in java?

A subclass inherits all of the public ...READ MORE

Apr 30, 2018 in Java by Daisy
 • 8,140 points • 2,448 views
0 votes
1 answer

What are optional parameters in Java

Using three dots: public void move(Object... x) { ...READ MORE

Apr 27, 2018 in Java by developer_1
 • 3,350 points • 1,555 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
 • 3,620 points • 5,203 views
0 votes
1 answer

How can I create an executable JAR with dependencies using Maven?

<build> <plugins> <plugin> ...READ MORE

Apr 26, 2018 in Java by sophia
 • 1,400 points • 1,666 views
0 votes
1 answer

difference between wait() and sleep() in java

We can find a big difference between ...READ MORE

Apr 26, 2018 in Java by developer_1
 • 3,350 points • 1,735 views
0 votes
1 answer

what are the ways in which a list can be iterated

  There are 5 ways to iterate over ...READ MORE

Apr 23, 2018 in Java by sharth
 • 3,370 points • 1,479 views
0 votes
1 answer

How can I Sort an ArrayList in Java

You can sort the ArrayList in 2 ...READ MORE

Apr 23, 2018 in Java by sharth
 • 3,370 points • 1,218 views
0 votes
1 answer

What is the difference between jdk and jre?

JRE: It stands for Java Runtime Environment. ...READ MORE

Apr 20, 2018 in Java by Akrati
 • 3,190 points • 2,607 views
0 votes
1 answer

How can a war file be deployed in Tomcat 7?

You can access your application from: http://localhost:8080/sample Deploying ...READ MORE

Apr 20, 2018 in Java by sophia
 • 1,400 points • 2,432 views
0 votes
1 answer

How do I create a Java string from the contents of a file?

If you're looking for an alternative that ...READ MORE

Apr 19, 2018 in Java by Rishabh
 • 3,620 points • 1,590 views
0 votes
1 answer

Following error is occurring "Can't start Eclipse - Java was started but returned exit code=13"

There are combinations of Operating System, JDK ...READ MORE

Apr 19, 2018 in Java by Rishabh
 • 3,620 points • 3,498 views
0 votes
1 answer

How to fix the error failed to load the JNI shared Library?

You need these three things : 64-bit OS 64-bit ...READ MORE

Apr 19, 2018 in Java by sophia
 • 1,400 points • 3,094 views
0 votes
1 answer

Sort a Map<Key, Value> by values

This might help solve your problem...!!!! public class ...READ MORE

Apr 18, 2018 in Java by Rishabh
 • 3,620 points • 1,436 views
0 votes
1 answer

Sorted array is being processed faster than unsorted array. Why is it so ?

What is Branch Prediction? Consider a railroad junction: Now ...READ MORE

Apr 18, 2018 in Java by Rishabh
 • 3,620 points • 1,661 views
0 votes
1 answer

Is it possible to run a java program from command line on windows?How?

  Let's say your file is in C:\myprogram\ Run ...READ MORE

Apr 18, 2018 in Java by sophia
 • 1,400 points • 3,329 views
0 votes
1 answer

I am learning looping statements. Can you tell me how 'for-each' works in Java?

While programming we often write code that ...READ MORE

Apr 17, 2018 in Java by Rishabh
 • 3,620 points • 1,328 views
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