Write or redirect standard output error stream to a file in java
Given a standard error output stream, Write the standard error to a file in java. We will use System.setErr method to redirect std output to a file.
Write or redirect console output to a file & again reset to standard output in java
In java application, we write to console output using System.out.print*. We would like to redirect console output to a file.
Convert String variable to Integer in java (example)
Given an String variable in java, we would like convert String to integer using Integer.parseInt, Integer.valueOf or Integer constructor (with example)
List multiple image, video, text files (extensions) in directory/folder (FilenameFilter/java)
Given input directory containing different files like image, video, text, csv, json etc. We would like to list files having
Recursively list all files present in directory /sub-directories of input folder (java /example)
Given an input directory of given file system in java. We would like to list all files present in a
List all directories of input path – scope operator & file filter in java
Given an input directory, List or print folders contained in a input directory path scope operator & file filter in java (IO operation /example)
Recursively list all files & folders of input directory in java (example)
Given an input directory or folder, we would like to list all files & folders in a directory. We will
Read property file from resource folder /directory in java (example)
Given a property file defining the properties of a java application. Property file will be residing in the resource folder/directory.
Java Concurrency – Thread join example with Runnable interface a
What thread’s join method? The join method allows one thread to wait for the completion of another thread. Suppose we
Print / list all fonts & font family using java (example)
List all system fonts and font families using GraphicsEnvironment. We will iterate through system fonts and we will print the
Calculate total, free & used memory of JVM heap store – Java runtime (example)
Given a java program, where we are allocating memory in heap store. We will allocate array (array of long primitives).
Print or list all environment variables using java8 streams
We will get list of all environment variables using System class. We will iterate through the map of system variables
Print or List locales, country codes / names / languages using java8
In current post, we will print /displays locales, country codes, country names and country languages. We will use Locale class
Print or list all system properties using java8 streams
Print or list or display all system properties using forEach method java 8 streams lambda. Print key value pairs of properties in java
Find second smallest element in an array of integers (java / example)
Given an array of integers in java. Print second smallest element in an array (in single iteration). We have already discussed
Convert given string to character array in java (with example)
Given an input string in java, convert input string to character array. We will iterate through char array to print each character.
Difference b/w length & capacity method (impact of trim) of StringBuffer in java
StringBuffer is a thread-safe, mutable sequence of characters. StringBuffer can be modified at any point of time. We will look
Convert String object to lower case & upper case in java (example)
Given a String in java, we would like to convert the input String to lower case & upper case. String
Difference between == operator & equals method in java (example)
Difference between equality operator & equals method in java. == operator is used to compare primitives & equals method is used to compare objects (example)
Implement two stacks using single array in java (example)
Given an array of integers in java. Create two stacks using single array. We shall able to perform push &
Find second largest element in an array of integers (java / example)
Given an array of integers in java. Print second largest element in an array (in single iteration). Example – find second largest
Create/ implement stack using single linked list in java (generics /example)
Create stack in java using linked list. We will implement stack using java generics. We will create a stack class,
Create or implement stack using array in java (with example)
Create or implement stack in java using array as underlying data structure. We will create stack class having following methods
Find missing number or element from duplicated array in java
Given two arrays, one array is almost duplicate array of another array. Arrays are duplicated except one element. e.g. array1[] =
Find maximum sum subarray in java using Kadane’s algorithm
Given an array containing positive & negative integers. We would like to find subarray having maximum sum. We will use
Reverse an integer array in java using iterative & recursive algorithm
Given an integer array in java. Reverse input array using iterative & recursive algorithm. Example to reverse an integer array
Prime number generator in java using Sieve of Eratosthenes algorithm
A prime number is a natural number greater than 1 that has no positive divisors other than 1 & itself. e.g.Number 7
Find union of two sorted integer or number arrays in java (example)
Given two sorted integer arrays containing unique or distinct elements. We would like to find out the union of two
Find intersection/common elements of two sorted integer arrays in java (example)
Given two sorted arrays containing distinct elements. We would like to find out the intersection of two sorted arrays. Intersection
Replace every element in integer array by greatest number on its right (java/ example)
Given an array of integers in java. Replace every element of array with greatest number on its right. The right