Merge pull request #42 from amitrp/aph-15336_case_insensitive_text_seach_in_lists

aph-15336 Lists case-insensitive text search

Author: amitrp

README.md

@@ -123,6 +123,7 @@ This project contains Core Java code samples that are used as examples on [amitp
 
 ### [Flattening Nested Lists in Java](https://www.amitph.com/java-flatten-nested-lists/)
 
+### [Case-Insensitive Search in Java ArrayLists](https://www.amitph.com/java-arraylists-case-insensitive-search/)
 
 ## How to use
 *Clone the project using*

java-collections/README.md

@@ -86,6 +86,8 @@ This project contains Java Collections code samples that are used as examples on
 
 ### [Flattening Nested Lists in Java](https://www.amitph.com/java-flatten-nested-lists/)
 
+### [Case-Insensitive Search in Java ArrayLists](https://www.amitph.com/java-arraylists-case-insensitive-search/)
+
 
 ## How to use
 *Clone the project using*

java-collections/src/main/java/com/amitph/java/collections/list/ListCaseInsensitiveSearcher.java

@@ -0,0 +1,64 @@
+package com.amitph.java.collections.list;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class ListCaseInsensitiveSearcher {
+    private final List<String> list = List.of("Ray", "Leo", "Bee", "Tim");
+
+    public void usingStreams() {
+        boolean contains = list.stream()
+                .anyMatch(x -> x.equalsIgnoreCase("raY"));
+        System.out.println(contains);
+    }
+
+    public void usingUtilityMethod() {
+        boolean contains = ListCaseInsensitiveSearcher.searchIgnoringCase(list, "lEo");
+        System.out.println(contains);
+    }
+
+    public void usingOverriddenContains() {
+        List<String> customList = new CaseInsensitiveArrayList(list);
+
+        System.out.println(customList.contains("raY"));
+
+        System.out.println(
+                customList.containsAll(List.of("ray", "bEE", "tIm")));
+    }
+
+    public static boolean searchIgnoringCase(List<String> list, String text) {
+        for (String s : list) {
+            if (s.equalsIgnoreCase(text)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static void main(String[] a) {
+        ListCaseInsensitiveSearcher searcher = new ListCaseInsensitiveSearcher();
+
+        System.out.println("Using Java Streams");
+        searcher.usingStreams();
+
+        System.out.println("Using Util Method");
+        searcher.usingUtilityMethod();
+
+        System.out.println("Using Custom List - overriding the contains()");
+        searcher.usingOverriddenContains();
+    }
+}
+
+class CaseInsensitiveArrayList extends ArrayList<String> {
+    public CaseInsensitiveArrayList(Collection<String> c) {
+        super(c);
+    }
+
+    @Override
+    public boolean contains(Object o) {
+        String text = (String) o;
+        return this.stream()
+                .anyMatch(x -> x.equalsIgnoreCase(text));
+    }
+}