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<!DOCTYPE html>
<html lang="en">
<!-- template for the main page -->
<head>
<meta charset="UTF-8">
<!-- <meta name="viewport" content="width=device-width, initial-scale=1.0"> -->
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>Home</title>
</head>
<body>
<div class="container">
<div class="jumbotron">
<center>
<h1>30s of Java 8</h1>
<p>Short Java 8 code snippets for all your development needs </p>
</center>
</div>
<!-- <p>This is some text.</p> -->
<!-- <p>This is another text.</p> -->
</div>
<div class="container">
<div class="card-columns">
<div class="card">
<div class="card-body">
<h5 class="card-title">Char digit to Integer</h5>
<p class="card-text"> Covert character digit to integer </p>
<p class="card-text"><small class="text-muted">Character.getNumericValue('9') or just '9' - '0' </small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Copy one collection to another</h5>
<p class="card-text"> Copies elements from one collection to another. </p>
<p class="card-text"><small class="text-muted"> Collection.copy(dest,src) </small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Count Vowels</h5>
<p class="card-text"> Returns the number of vowels in the provided string. </p>
<p class="card-text"><small class="text-muted"> int count = input_str.replaceAll("[^aeiou]", "").length()</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Distinct values of Array </h5>
<p class="card-text"> filters out all the unique/distinct elements from the array </p>
<p class="card-text"><small class="text-muted">Arrays.stream(elements).distinct().toArray();</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Safe compare Double values</h5>
<p class="card-text"> Safely compare double values with high precision </p>
<p class="card-text"><small class="text-muted">Double.compare(1.233333,1.2333333) == 0 </small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Filter</h5>
<p class="card-text"> The filter method is used to filter some data from the collection. </p>
<p class="card-text"><small class="text-muted"> List<Integer> temp = list.stream().filter(e->e%2 == 0).collect(Collectors.toList());</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">forEach</h5>
<p class="card-text"> this operation used to traverse all the elements in the Collection </p>
<p class="card-text"><small class="text-muted">list.stream().forEach(System.out::println)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">GCD Using BigInteger</h5>
<p class="card-text"> BigInteger has built in method for the calculating gcd of two numbers </p>
<p class="card-text"><small class="text-muted"> int result = BigInteger.valueOf(a).gcd(BigInteger.valueOf(b)).intValueExact();</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Get Average </h5>
<p class="card-text"> Returns the average of integer array. </p>
<p class="card-text"><small class="text-muted"> IntStream.of(arr).average()</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Index of SubList</h5>
<p class="card-text"> return the starting position of first occurrences of the specified target list in source list orElse -1 </p>
<p class="card-text"><small class="text-muted"> Collections.indexOfSubList(list_src,list_target)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">isPalindrome</h5>
<p class="card-text"> check if given string is palindrome or not </p>
<p class="card-text"><small class="text-muted">boolean res = str.equals(new StringBuilder(str).reverse().toString())</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Max of Collection</h5>
<p class="card-text"> Returns the maximum element of the given collection, according to the natural ordering of its elements. </p>
<p class="card-text"><small class="text-muted">Collections.max(list)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Binary search in sorted collection</h5>
<p class="card-text"> search element in sorted collection O(logn) </p>
<p class="card-text"><small class="text-muted"> int pos = Collection.binarySearch(list,key)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Min of Collection</h5>
<p class="card-text"> Returns the minimum element of the given collection, according to the natural ordering of its elements. </p>
<p class="card-text"><small class="text-muted">Collections.min(list)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Filter non Unique </h5>
<p class="card-text"> filters out all the non unique elements from the array </p>
<p class="card-text"><small class="text-muted">Arrays.stream(elements).filter(el -> indexOf(elements, el) == lastIndexOf(elements, el)).toArray();</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Check for Primality Using BigInteger</h5>
<p class="card-text"> java.math.BigInteger has built in method isProbablePrime which check for primality </p>
<p class="card-text"><small class="text-muted">boolean result = BigInteger.valueOf(num).isProbablePrime(100)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Python 'str'*5 in java </h5>
<p class="card-text"> There's no built in method for string repeat in java but we can achieve this using streams. </p>
<p class="card-text"><small class="text-muted">String res = String.join("",Collections.ncopies(ntimes,"string"));</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Reverse the order of Elements</h5>
<p class="card-text"> reverses the order of all the elements inside the list </p>
<p class="card-text"><small class="text-muted">Collections.reverse(list)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Rotate </h5>
<p class="card-text"> Rotates the elements in the specified list by the specified distance. </p>
<p class="card-text"><small class="text-muted"> Collections.rotate(list,key)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Random Permutation of List</h5>
<p class="card-text"> Randomly permutes the specified list using a default source of randomness. </p>
<p class="card-text"><small class="text-muted"> Collections.shuffle(list)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Last Index of SubList</h5>
<p class="card-text"> return the starting position of last occurrences of the specified target list in source list orElse -1 </p>
<p class="card-text"><small class="text-muted"> Collections.lastIndexOfSubList(list_src,list_target)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Collect</h5>
<p class="card-text"> The collect method is used to return the result of the intermediate operations performed on the stream </p>
<p class="card-text"><small class="text-muted"> Set square = list.stream().collect(Collectors.toSet());</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Sort characters in String </h5>
<p class="card-text"> sort characters in a string using stream </p>
<p class="card-text"><small class="text-muted">String result = Arrays.stream(input_str.split("")).sorted().collect(Collectors.joining());</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Count the frequency</h5>
<p class="card-text"> count the occurrences of element in Collection </p>
<p class="card-text"><small class="text-muted"> int a = Collections.frequency(list,key);</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Sort the Collection</h5>
<p class="card-text"> Sorts the specified list into ascending order, according to the natural ordering of its elements. </p>
<p class="card-text"><small class="text-muted">Collections.sort(list)</small></p>
</div>
</div>
<div class="card">
<div class="card-body">
<h5 class="card-title">Sort the Collection with custom comparator</h5>
<p class="card-text"> Sorts the specified list according to the order induced by the specified comparator. </p>
<p class="card-text"><small class="text-muted">Collections.sort(list,Comparator.reverseOrder())</small></p>
</div>
</div>