Latest questions in Java

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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
633 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
• 3,540 points
125 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
• 3,540 points
949 views
0 votes
3 answers

Convert date object to a String

We parse the full date to time ...READ MORE

Jul 30, 2018 in Java by samarth295
• 2,190 points
74 views
0 votes
3 answers

How can I add new elements to an Array in Java

String[] source = new String[] { "a", ...READ MORE

Sep 19, 2018 in Java by Sushmita
• 6,880 points
188 views
0 votes
4 answers

How can we define global variables in java?

class G { static String globalVar ...READ MORE

Jan 29, 2019 in Java by zemiak
7,831 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
831 views
0 votes
3 answers

How to parse JSON in Java

import org.json.*; JSONObject obj = new JSONObject(" .... ...READ MORE

Aug 20, 2018 in Java by Daisy
• 8,080 points
1,812 views
0 votes
2 answers

Generate an alpha-numeric string randomly

Java supplies a way of doing this ...READ MORE

Jul 18, 2018 in Java by Daisy
• 8,080 points
479 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
• 3,540 points
81 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: Image by ...READ MORE

Apr 18, 2018 in Java by Rishabh
• 3,540 points
163 views
0 votes
3 answers

How to check whether a file exists or not in Java?

Using nio we can check whether file ...READ MORE

Aug 14, 2018 in Java by Sushmita
• 6,880 points
371 views
0 votes
3 answers

How to read input from Console using Scanner Class?

A simple example: import java.util.Scanner; public class Expl { ...READ MORE

Jul 31, 2018 in Java by samarth295
• 2,190 points
532 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
105 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
273 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 parth295
• 4,640 points
93 views
0 votes
2 answers

How do I read and convert an InputStream object to string type?

You can also use Java Standard Library ...READ MORE

Jul 17, 2018 in Java by Sushmita
• 6,880 points
5,479 views
0 votes
2 answers

“Could not find or load main class” mean?

Use the final modifier to enforce good initialization. Avoid returning ...READ MORE

Sep 18, 2018 in Java by Sushmita
• 6,880 points
1,966 views
0 votes
2 answers

Performing Iteration over each entry in a 'Map'

In Java 8 you can do it ...READ MORE

Oct 24, 2018 in Java by Sushmita
• 6,880 points
74 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
• 3,540 points
79 views
0 votes
1 answer

How to print java array in the simplest way?

String[] arr = new String[] {"John", "Mary", ...READ MORE

Apr 17, 2018 in Java by sophia
• 1,400 points
109 views
0 votes
1 answer

How to take input from users?

Scanner Class is used to take input ...READ MORE

Apr 17, 2018 in Java by Akrati
• 3,150 points
49 views
0 votes
2 answers

How to test that an array contains a certain value?

public static final String[] VALUES = new ...READ MORE

Jul 17, 2018 in Java by Sushmita
• 6,880 points
74 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
• 2,190 points
236 views
0 votes
0 answers

Ho do I Iterate through a HashMap which contains duplicate values

What is the fastest and the best ...READ MORE

Apr 16, 2018 in Java by Daisy
• 8,080 points
74 views
0 votes
3 answers

Check if a String is numeric in Java

Java 8 Lambda Expression is used: String someString ...READ MORE

Sep 3, 2018 in Java by Daisy
• 8,080 points
986 views
0 votes
2 answers

How is hashmap different from hashtable?

HashMap and HashTable: 1) Hashtable and Hashmap implement ...READ MORE

Aug 1, 2018 in Java by samarth295
• 2,190 points
1,319 views
0 votes
2 answers

How to convert an array to arraylist?

In Java 9 you can use: List<String> list= List.of("Hello", "World", ...READ MORE

Aug 1, 2018 in Java by samarth295
• 2,190 points
61 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
• 2,190 points
143 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
• 2,190 points
146 views
0 votes
4 answers

Remove extra spaces from string in java

import java.util.regex.Matcher; import java.util.regex.Pattern; String pattern="[\\s]"; String replace=""; part="name=john age=13 year=2001"; Pattern ...READ MORE

Sep 10, 2018 in Java by parth295
• 4,640 points
158 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
• 6,880 points
83 views
0 votes
1 answer

How do I fix a NullPointerException?

When you declare a reference variable (i.e. ...READ MORE

Apr 13, 2018 in Java by parth295
• 4,640 points
125 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
• 44,350 points
144 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
413 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
• 44,350 points
117 views
0 votes
2 answers

What is the syntax to initialize an array?

Rather than learning un-Official websites learn from ...READ MORE

Aug 2, 2018 in Java by samarth295
• 2,190 points
74 views
0 votes
2 answers

How to create a 2-D array in java?

int[][] multi = new int[5][]; multi[0] = new ...READ MORE

Jul 16, 2018 in Java by Daisy
• 8,080 points
67 views
0 votes
2 answers

Integer to String conversion in java

We can do this in 2 ways: String ...READ MORE

Jul 27, 2018 in Java by samarth295
• 2,190 points
102 views
0 votes
1 answer

How to divide a string in two parts

String s="yourstring"; boolean flag = true; for(int i=0;i<s.length();i++) { ...READ MORE

Apr 13, 2018 in Java by Rishabh
• 3,540 points
66 views
+1 vote
2 answers

How to generate random integers within specific range in Java?

You can achieve that concisely in Java: Random ...READ MORE

Jul 25, 2018 in Java by samarth295
• 2,190 points
80 views
0 votes
5 answers

How to compare Strings in Java?

String fooString1 = new String("foo"); String fooString2 = ...READ MORE

Jul 12, 2018 in Java by Daisy
• 8,080 points
162 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
• 6,880 points
158 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
• 44,350 points
248 views
+1 vote
3 answers

What is the syntax to declare and initialize an array in java?

You can use this method: String[] strs = ...READ MORE

Jul 25, 2018 in Java by samarth295
• 2,190 points
939 views
+5 votes
3 answers

How to execute a python file with few arguments in java?

You can use Java Runtime.exec() to run python script, ...READ MORE

Mar 27, 2018 in Java by DragonLord999
• 8,400 points

edited Nov 6, 2018 by Omkar 12,713 views