examples on Map

Author: m999rvi

README.md

@@ -18,7 +18,7 @@ Enjoy!
 
 Rudy Vissers [Belgium]
 
-122 tests 
+120 tests 
 -
 mvn clean install on Java 8 -> OK
 

src/test/java/api/java/util/map/MapComputeIfAbsentExample.java

@@ -0,0 +1,33 @@
+package api.java.util.map;
+
+import java.util.HashMap;
+import java.util.Map;
+public class MapComputeIfAbsentExample {
+    public static void main(String[] args) {
+        // Create a map
+        Map<String, Integer> scores = new HashMap<>();
+
+        // Retrieve the value for a key, or compute and store a new value if the key is absent
+        int johnsScore = scores.computeIfAbsent("John", key -> computeScore(key));
+        System.out.println("John's Score: " + johnsScore);
+
+        // Retrieve the existing value for a key
+        int marysScore = scores.computeIfAbsent("Mary", key -> computeScore(key));
+        System.out.println("Mary's Score: " + marysScore);
+
+        // Print the updated map
+        System.out.println("Updated Map: " + scores);
+
+        // Update the value of a non-absent key
+        marysScore = scores.computeIfAbsent("Mary", key -> computeScore(key) * 2);
+
+        // Print the updated map
+        System.out.println("value of Map for Mary was not updated: " + scores);
+    }
+
+    // A method to compute the score based on the key
+    private static int computeScore(String key) {
+        System.out.println("Computing score for: " + key);
+        return key.length() * 10;
+    }
+}

src/test/java/api/java/util/MapTest.java …test/java/api/java/util/map/MapTest.javasrc/test/java/api/java/util/MapTest.java renamed to src/test/java/api/java/util/map/MapTest.java src/test/java/api/java/util/MapTest.java renamed to src/test/java/api/java/util/map/MapTest.java

@@ -1,4 +1,4 @@
-package api.java.util;
+package api.java.util.map;
 
 import org.junit.Test;