10 - Methods in Java/008 Filter String array.html

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            const quizData = {"title": "008 Filter String array", "hasInstructions": true, "hasTests": true, "hasSolutions": true, "instructions": "<ol><li><p>Implement console program which will meet the following requirements:</p><ol><li><p>Program starts and asks user to enter random words separated by space</p></li><li><p>Program asks user to enter minimum length of string to filter words which were entered</p></li><li><p>Program creates array object from entered words</p></li><li><p>Program calls specific method which takes String[] as a parameter and returns array of strings which contains words that have length more or equal to value specified by user<br><br><strong><em>Method should look like this:<br>public static String[] filterWordsByLength(int minLength, String[] words) {</em></strong></p></li></ol><p><strong><em>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;write your code here&gt;<br>&nbsp; &nbsp; &nbsp; }</em></strong><br><br><br></p><p>c. Program prints filtered array to the console output.</p></li></ol>", "tests": [{"file_name": "Evaluate.java", "content": "import org.junit.Test;\nimport org.junit.Assert;\nimport com.udemy.ucp.*;\nimport static org.junit.Assert.assertEquals;\n\nimport java.util.Arrays;\n\nimport org.junit.Test;\n\npublic class Evaluate {\n    @Test\n\tpublic void shouldFilterWordsByMinLength() {\n\t\tString[] input = { \"asd\", \"asdf\", \"as\", \"asdfg\", \"a\" };\n\t\tint minLength = 3;\n\n\t\tassertEquals(\"[asd, asdf, asdfg]\",\n\t\t\t\tArrays.toString(FilterStringArray.filterWordsByLength(minLength, input)));\n\t}\n\n\t@Test\n\tpublic void shouldFilterWordsByMinLength2() {\n\t\tString[] input = { \"asd\", \"asdf\", \"as\", \"asdfg\", \"a\" };\n\t\tint minLength = 2;\n\n\t\tassertEquals(\"[asd, asdf, as, asdfg]\",\n\t\t\t\tArrays.toString(FilterStringArray.filterWordsByLength(minLength, input)));\n\t}\n}\n"}], "solutions": [{"file_name": "FilterStringArray.java", "content": "import java.util.Arrays;\r\nimport java.util.Scanner;\r\n\r\npublic class FilterStringArray {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tScanner sc = new Scanner(System.in);\r\n\t\tSystem.out.print(\"Please, enter any words separated by space: \");\r\n\t\tString userInput = sc.nextLine();\r\n\t\tSystem.out.print(\"Please, enter minumum word length to filter words: \");\r\n\t\tint minLength = sc.nextInt();\r\n\t\t\r\n\t\tString[] words = userInput.split(\"\\\\s+\");\r\n\t\tString[] filteredWords = filterWordsByLength(minLength, words);\r\n\t\tSystem.out.println(Arrays.toString(filteredWords));\r\n\t}\r\n\r\n\t\r\n\t\r\n\tpublic static String[] filterWordsByLength(int minLength, String[] words) {\r\n\t\tString[] filteredArray = new String[words.length];\r\n\t\tfor (int i = 0; i < words.length; i++) {\r\n\t\t\tif (words[i].length() >= minLength) {\r\n\t\t\t\tfilteredArray[i] = words[i];\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\tfilteredArray = filterNulls(filteredArray);\r\n\t\t\r\n\t\treturn filteredArray;\r\n\t}\r\n\r\n\r\n\r\n\tprivate static String[] filterNulls(String[] arr) {\r\n\t\tint newArraySize = 0;\r\n\t\tfor (String word : arr) {\r\n\t\t\tif (word != null) {\r\n\t\t\t\tnewArraySize++;\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\tString[] filteredArray = new String[newArraySize];\r\n\t\t\r\n\t\tint filteredArrayIndex = 0;\r\n\t\tfor (String word : arr) {\r\n\t\t\tif (word != null) {\r\n\t\t\t\tfilteredArray[filteredArrayIndex++] = word;\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\treturn filteredArray;\r\n\t}\r\n\r\n\r\n}\r\n"}]};

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