2020-12-09 Update: Added "Odd-Even String Sort" and "How many times does it contain?"

Author: fartem

README.md

@@ -112,6 +112,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
 | Greatest common divisor | [Link](https://www.codewars.com/kata/5500d54c2ebe0a8e8a0003fd) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/GreatestCommonDivisor.java) |
 | Highest and Lowest | [Link](https://www.codewars.com/kata/554b4ac871d6813a03000035) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HighestAndLowest.java) |
 | How many arguments | [Link](https://www.codewars.com/kata/5c44b0b200ce187106452139) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HowManyArguments.java) |
+| How many times does it contain? | [Link](https://www.codewars.com/kata/584466950d3bedb9b300001f) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HowManyTimesDoesItContain.java) |
 | Insert dashes | [Link](https://www.codewars.com/kata/55960bbb182094bc4800007b) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/InsertDashes.java) |
 | Inspiring Strings | [Link](https://www.codewars.com/kata/5939ab6eed348a945f0007b2) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/InspiringStrings.java) |
 | Is valid identifier? | [Link](https://www.codewars.com/kata/563a8656d52a79f06c00001f) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/IsValidIdentifier.java) |
@@ -121,6 +122,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
 | max diff - easy | [Link](https://www.codewars.com/kata/588a3c3ef0fbc9c8e1000095) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/MaxDiffEasy.java) |
 | Maximum Multiple | [Link](https://www.codewars.com/kata/5aba780a6a176b029800041c) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/MaximumMultiple.java) |
 | Maximum Product | [Link](https://www.codewars.com/kata/5a4138acf28b82aa43000117) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/MaximumProduct.java) |
+| Odd-Even String Sort | [Link](https://www.codewars.com/kata/580755730b5a77650500010c) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/OddEvenStringSort.java) |
 | Ordering the words! | [Link](https://www.codewars.com/kata/55d7e5aa7b619a86ed000070) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/OrderingTheWords.java) |
 | Overflowing with joy | [Link](https://www.codewars.com/kata/55186c0f4149dd08a7000006) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/OverflowingWithJoy.java) |
 | Parts of a list | [Link](https://www.codewars.com/kata/56f3a1e899b386da78000732) | [Link](./src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/PartsOfAList.java) |

src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HowManyTimesDoesItContain.java

@@ -0,0 +1,18 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu7;
+
+// https://www.codewars.com/kata/584466950d3bedb9b300001f
+public class HowManyTimesDoesItContain {
+
+ private final String string;
+ private final char symbol;
+
+ public HowManyTimesDoesItContain(String string, char symbol) {
+ this.string = string;
+ this.symbol = symbol;
+ }
+
+ public int solution() {
+ return (int) string.chars().filter(i -> i == symbol).count();
+ }
+
+}

src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu7/OddEvenStringSort.java

@@ -0,0 +1,29 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu7;
+
+// https://www.codewars.com/kata/580755730b5a77650500010c
+public class OddEvenStringSort {
+
+ private final String input;
+
+ public OddEvenStringSort(String input) {
+ this.input = input;
+ }
+
+ public String solution() {
+ StringBuilder evens = new StringBuilder();
+ StringBuilder odds = new StringBuilder();
+ for (int i = 0; i < input.length(); i++) {
+ char symbol = input.charAt(i);
+ if (i % 2 == 0) {
+ evens.append(symbol);
+ } else {
+ odds.append(symbol);
+ }
+ }
+ return evens
+ .append(" ")
+ .append(odds.toString())
+ .toString();
+ }
+
+}

src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu7/HowManyTimesDoesItContainTest.java

@@ -0,0 +1,41 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu7;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class HowManyTimesDoesItContainTest {
+
+ @Test
+ public void exampleTests() {
+ assertEquals(
+ 2,
+ new HowManyTimesDoesItContain(
+ "Hello World",
+ 'o'
+ ).solution()
+ );
+ assertEquals(
+ 4,
+ new HowManyTimesDoesItContain(
+ "Wait isn't it supposed to be cynical?",
+ 'i'
+ ).solution()
+ );
+ assertEquals(
+ 4,
+ new HowManyTimesDoesItContain(
+ "I'm gona be the best code warrior ever dad",
+ 'r'
+ ).solution()
+ );
+ assertEquals(
+ 1,
+ new HowManyTimesDoesItContain(
+ "Do you like Harry Potter?",
+ '?'
+ ).solution()
+ );
+ }
+
+}

src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu7/OddEvenStringSortTest.java

@@ -0,0 +1,49 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu7;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class OddEvenStringSortTest {
+
+ @Test
+ public void testSomething() {
+ assertEquals(
+ "Wleclgltihuebredrf ofsheesenasnegrof",
+ new OddEvenStringSort(
+ "Wolfeschlegelsteinhausenbergerdorff"
+ ).solution()
+ );
+ assertEquals(
+ "MTINLHENLHENGUAIYAGNL EHOYTROYTROYLTMNLRIY",
+ new OddEvenStringSort(
+ "METHIONYLTHREONYLTHREONYGLUTAMINYLARGINYL"
+ ).solution()
+ );
+ assertEquals(
+ "PEMNUTAIRSOISLCVLAOOISS NUOOLRMCOCPCIIOOCNCNOI",
+ new OddEvenStringSort(
+ "PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS"
+ ).solution()
+ );
+ assertEquals(
+ "PEDPEDHPPRTYODS SUOSUOYOAAHRIIM",
+ new OddEvenStringSort(
+ "PSEUDOPSEUDOHYPOPARATHYROIDISM"
+ ).solution()
+ );
+ assertEquals(
+ "FOCNUIIIIIIIAIN LCIACNHLPLFCTO",
+ new OddEvenStringSort(
+ "FLOCCINAUCINIHILIPILIFICATION"
+ ).solution()
+ );
+ assertEquals(
+ "SBEMTGYHC UDRAOLPI",
+ new OddEvenStringSort(
+ "SUBDERMATOGLYPHIC"
+ ).solution()
+ );
+ }
+
+}