Differenze

Queste sono le differenze tra la revisione selezionata e la versione attuale della pagina.

--- lpr-b:lpr-b-09:soluzioni [22/10/2009 alle 20:18 (16 anni fa)] – Andrea Corradini
+++ lpr-b:lpr-b-09:soluzioni [22/10/2009 alle 20:42 (16 anni fa)] (versione attuale) – Andrea Corradini
@@ Linea 5: / Linea 5: @@
 [[FAQ|FAQ]]
-===== Tasks e Threads Es 1 =====
+====== Tasks e Threads ======
+===== PrintTask =====
 <code:java>
@@ Linea 57: / Linea 60: @@
 </code>
-===== Tasks e Threads Es 2 =====
+===== SleepTask =====
 <code:java>
@@ Linea 99: / Linea 102: @@
 </code>
-====== Tasks e Threads ======
+===== PITask2 =====
-===== Tasks e Threads Es 3 =====
 <code:java>
-public class PITask implements Runnable
+public class PITask2 implements Runnable
 {
 	private double piEstimate = 0.0;
@@ Linea 162: / Linea 164: @@
 ====== Thread Pool ======
-===== Thread Pool Es 1 =====
+===== AsynchronousCalculator =====
 <code:java>
@@ Linea 240: / Linea 242: @@
 		System.out.println("Main esce");
 	}
+}
+</code>
+===== Task =====
+<code:java>
+import java.text.SimpleDateFormat;
+import java.util.Date;
+public abstract class Task implements Runnable
+{
+	public long creationTime;
+	public long startTime;
+	public long endTime;
+	public String result;
+	public Task()
+	{
+		this.creationTime = System.currentTimeMillis();
+	}
+	public abstract void compute();
+	public void setResult(String result)
+	{
+		this.result = result;
+	}
+	public void run()
+	{
+		this.startTime = System.currentTimeMillis();
+		compute();
+		this.endTime = System.currentTimeMillis();
+		printResult();
+	}
+	public void printResult()
+	{
+		SimpleDateFormat formatter = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss:SS");
+		String creationString = formatter.format(new Date(this.creationTime));
+		String startString = formatter.format(new Date(this.startTime));
+		String endString = formatter.format(new Date(this.endTime));
+		System.out.println(Thread.currentThread().getName()
+				+ ", creationTime = " + creationString + ", startTime = "
+				+ startString + ", endTime = " + endString + ", " + result);
+	}
+}
+</code>
+===== PITask =====
+<code:java>
+public class PITask extends Task
+{
+	private double piEstimate = 0.0;
+	private long iteration = 0;
+	private int sign = -1;
+	private double accuracy;
+	public PITask(int precision)
+	{
+		this.accuracy = Math.pow(10, -1 * precision);
+	}
+	public void compute()
+	{
+		while(Math.abs(piEstimate - Math.PI) > accuracy)
+		{
+			iteration++;
+			sign = -sign;
+			piEstimate += sign * 4.0 / ((2 * iteration) - 1);
+		}
+		setResult("Pigreco = " + piEstimate + ", accuracy = " + this.accuracy);
+	}
+}
+</code>
+===== FibTask =====
+<code:java>
+public class FibTask extends Task
+{
+	int value;
+	public FibTask(int value)
+	{
+		this.value = value;
+	}
+	private int fib(int n)
+	{
+		if(n == 0 || n == 1) return n;
+		if(n == 1) return 1;
+		return fib(n - 1) + fib(n - 2);
+	}
+	public void compute()
+	{
+		int result = this.fib(value);
+		setResult("Fib(" + value + ") = " + result);
+	}
+}
+</code>
+===== FactTask =====
+<code:java>
+public class FactTask extends Task
+{
+	int value;
+	public FactTask(int value)
+	{
+		this.value = value;
+	}
+	private long fact(int n)
+	{
+		if(n == 0) return 1;
+		if(n == 1) return 1;
+		return(n * fact(n - 1));
+	}
+	public void compute()
+	{
+		long result = this.fact(value);
+		setResult("Fact(" + value + ") = " + result);
+	}
+}
+</code>
+====== Indirizzi IP ======
+===== ListInterface =====
+<code:java>
+import java.util.Enumeration;
+import java.net.*;
+public class ListInterface
+{
+    public static void main(String[] args)
+    {
+	try
+	    {
+		Enumeration<NetworkInterface> interfaceList = NetworkInterface.getNetworkInterfaces();
+		if(interfaceList == null)
+		    {
+			System.out.println("Nessuna interfaccia di rete disponibile");
+		    }
+		else
+		    {
+			while(interfaceList.hasMoreElements())
+			    {
+				NetworkInterface iface = interfaceList.nextElement();
+				System.out.println("Interface " + iface.getName() + ":->" + iface.getDisplayName());
+				Enumeration<InetAddress> addrList = iface.getInetAddresses();
+				while(addrList.hasMoreElements())
+				    {
+					InetAddress address = addrList.nextElement();
+					System.out.print("\tIndirizzo " + ((address instanceof Inet4Address ? "(v4)"
+									    : (address instanceof Inet6Address ? "(v6)" : "(?)"))));
+					System.out.println(": " + address.getHostAddress());
+				    }
+			    }
+		    }
+	    }catch(SocketException e) { System.out.println(e);}
+    }
 }
 </code>