Challenge 61.

JavaZakariae · JavaZakariae · commit 603c9449bace · 2019-12-09T22:09:57.000+01:00
HashMap hashcode method implementation.
diff --git a/src/main/java/challenge61_70/Challenge_61.java b/src/main/java/challenge61_70/Challenge_61.java
@@ -0,0 +1,33 @@
+package challenge61_70;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *  HashMap's hashcode implementation
+ *  HashMap's put operation.
+ */
+public class Challenge_61 {
+    public static void main( String[] args ) {
+        Map<Map<Object, String>, String> mainMap = new HashMap<>();
+
+        Map<Object, String> subMap1 = new HashMap<>();
+        subMap1.put(1, "A");
+
+        Map<Object, String> subMap2 = new HashMap<>();
+        subMap2.put(1, "A");
+
+        Map<Object, String> subMap3 = new HashMap<>();
+        subMap3.put(65, "\01");
+
+        System.out.println("subMap1.hashCode() = " + subMap1.hashCode());
+        System.out.println("subMap3.hashCode() = " + subMap3.hashCode());
+        mainMap.put(subMap1, "crazyMap1");
+        mainMap.put(subMap2, "crazyMap2");
+        mainMap.put(subMap3, "crazyMap3");
+
+        System.out.println(mainMap.size());
+        System.out.println("mainMap.entrySet().size() = " + mainMap.entrySet().size());
+
+    }
+}
