[06] Create benchmark for Exception::new

Nicolai Parlog · Nicolai Parlog · commit 4aa59abd553d · 2019-05-25T07:57:15.000+02:00
diff --git a/src/main/java/org/codefx/demo/effective_java/_06_unnecessary_objects/Exceptions.java b/src/main/java/org/codefx/demo/effective_java/_06_unnecessary_objects/Exceptions.java
@@ -0,0 +1,27 @@
+package org.codefx.demo.effective_java._06_unnecessary_objects;
+
+import org.openjdk.jmh.annotations.Benchmark;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Exceptions extends ObjectCreationBenchmarks {
+
+	@Benchmark
+	public Exception createException() {
+		// NOTE expensive operation:
+		//   Exceptions capture the entire call stack, which takes some time.
+		return new IllegalArgumentException();
+	}
+
+	@Benchmark
+	public Map<String, Integer> createMap() {
+		var map = new HashMap<String, Integer>();
+		map.put("1", 1);
+		map.put("2", 1);
+		map.put("3", 1);
+		return map;
+	}
+
+}
diff --git a/src/main/java/org/codefx/demo/effective_java/_06_unnecessary_objects/UrlEquals.java b/src/main/java/org/codefx/demo/effective_java/_06_unnecessary_objects/UrlEquals.java
@@ -14,7 +14,7 @@ public class UrlEquals extends ObjectCreationBenchmarks {
 
 	@Benchmark
 	public boolean urlEqual() throws MalformedURLException {
-		// NOTE unnecessary object:
+		// NOTE expensive operation:
 		//   There isn't anything unnecessary here. It's just that URL::equals
 		//   resolves the host name, which can take a while...
 		return new URL(blog).equals(new URL(youtube));
