diff --git a/src/main/java/moe/nekojimi/chords/Format.java b/src/main/java/moe/nekojimi/chords/Format.java
index 0e26778..8391193 100644
--- a/src/main/java/moe/nekojimi/chords/Format.java
+++ b/src/main/java/moe/nekojimi/chords/Format.java
@@ -7,8 +7,7 @@ package moe.nekojimi.chords;
 
 import com.amihaiemil.eoyaml.Yaml;
 import com.amihaiemil.eoyaml.YamlMapping;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
+import java.util.Objects;
 import javax.json.JsonObject;
 
 /**
@@ -145,4 +144,42 @@ class Format
         return "Format{" + "code=" + code + ", extension=" + extension + ", resolution=" + resolution + ", note=" + note + '}';
     }
 
+    @Override
+    public int hashCode()
+    {
+        int hash = 7;
+        hash = 97 * hash + Objects.hashCode(this.extension);
+        hash = 97 * hash + Objects.hashCode(this.resolution);
+        hash = 97 * hash + (int) (this.size ^ (this.size >>> 32));
+        hash = 97 * hash + this.samplerate;
+        hash = 97 * hash + (this.audioOnly ? 1 : 0);
+        return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj)
+    {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final Format other = (Format) obj;
+        if (this.size != other.size)
+            return false;
+        if (this.samplerate != other.samplerate)
+            return false;
+        if (this.audioOnly != other.audioOnly)
+            return false;
+        if (!Objects.equals(this.code, other.code))
+            return false;
+        if (!Objects.equals(this.extension, other.extension))
+            return false;
+        if (!Objects.equals(this.resolution, other.resolution))
+            return false;
+        return true;
+    }
+
+
 }