BAEL-4718 using bytes array as key in HashMap (#10315)

java-collections-maps-3/src/main/java/com/baeldung/map/bytearrays/BytesKey.java

@@ -0,0 +1,28 @@
+package com.baeldung.map.bytearrays;
+
+import java.util.Arrays;
+
+public final class BytesKey {
+    private final byte[] array;
+
+    public BytesKey(byte[] array) {
+        this.array = array;
+    }
+
+    public byte[] getArray() {
+        return array.clone();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        BytesKey bytesKey = (BytesKey) o;
+        return Arrays.equals(array, bytesKey.array);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(array);
+    }
+}