New Examples

Author: lokeshgupta1981

src/main/java/com/howtodoinjava/core/string/StringConcatenationBenchmark.java

@@ -0,0 +1,82 @@
+package com.howtodoinjava.core.string;
+
+import java.time.LocalTime;
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+@State(Scope.Thread)
+public class StringConcatenationBenchmark {
+
+  @Param({"10", "100", "1000"})
+  private int count;
+
+  private String baseString;
+
+  @Setup
+  public void setup() {
+    baseString = "SampleString";
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.MICROSECONDS)
+  public String testStringConcatenation() {
+    String result = "";
+    for (int i = 0; i < count; i++) {
+      result += baseString;
+    }
+    return result;
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.MICROSECONDS)
+  public String testStringBuilder() {
+    StringBuilder builder = new StringBuilder();
+    for (int i = 0; i < count; i++) {
+      builder.append(baseString);
+    }
+    return builder.toString();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.MICROSECONDS)
+  public String testStringBuffer() {
+    StringBuffer buffer = new StringBuffer();
+    for (int i = 0; i < count; i++) {
+      buffer.append(baseString);
+    }
+    return buffer.toString();
+  }
+
+  public static void main(String[] args) throws Exception {
+
+    var name = "Alex";
+    var time = LocalTime.now();
+
+    String greeting = "Hello " + name + ", how are you?\nThe current time is " + time + " now!";
+    System.out.println(greeting);
+
+    String greetingTemplate = STR."Hello \{name}, how are you?\nThe current time is \{time} now!";
+    System.out.println(greetingTemplate);
+
+    Options opt = new OptionsBuilder()
+        .include(StringConcatenationBenchmark.class.getSimpleName())
+        .forks(1)
+        .build();
+
+    new Runner(opt).run();
+  }
+}
+