aaa

untitled/src/Main.java

@@ -0,0 +1,8 @@
+// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
+// then press Enter. You can now see whitespace characters in your code.
+public class Main {
+    public static void main(String[] args) {
+
+        
+    }
+}

untitled/src/StopUhr.java

@@ -0,0 +1,19 @@
+public class StopUhr
+{
+	private long startTime, stopTime;
+
+	public void start()
+	{
+		startTime = System.nanoTime();
+	}
+
+	public void stop()
+	{
+		stopTime = System.nanoTime();
+	}
+
+	public long getDuration()
+	{
+		return stopTime - startTime;
+	}
+}

untitled/src/Zeitmessung.java

@@ -0,0 +1,67 @@
+public class Zeitmessung
+{
+	static int tuWasCounter = 0;
+	private static double tuwas()
+	{
+		tuWasCounter++;
+		return Math.random();
+	}
+
+	// Linear
+	public static double func1(int n)
+	{
+		double summe = 0;
+
+		for (int a = 0; a < n; a++)
+			summe += tuwas();
+
+		return summe;
+	}
+
+	// Quadratisch
+	public static double func2(int n)
+	{
+		double summe = 0;
+
+		for (int a = 0; a < n; a++)
+			for(int b = 0; b < n; b++)
+				summe += tuwas();
+
+		return summe;
+	}
+
+	// log2(n)
+	public static double func6(int n)
+	{
+		double summe = 0;
+
+		while (n > 0)
+		{
+			summe += tuwas();
+			n /= 2;
+		}
+
+		return summe;
+	}
+
+	public static void main(String[] args)
+	{
+		StopUhr uhr = new StopUhr();
+		final int n = 100000;
+		tuWasCounter = 0;
+		uhr.start();
+		func1(n);
+		uhr.stop();
+		System.out.println("func1 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
+		tuWasCounter = 0;
+		uhr.start();
+		func2(n);
+		uhr.stop();
+		System.out.println("func2 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
+		tuWasCounter = 0;
+		uhr.start();
+		func6(n);
+		uhr.stop();
+		System.out.println("func6 "+"n="+n+" Zeit:"+uhr.getDuration()+" tuWasCounter:" + tuWasCounter);
+	}
+}