格式化代码

src/concurrency/HorseRace.java

@@ -1,91 +1,109 @@
 package concurrency;//: concurrency/HorseRace.java
 // Using CyclicBarriers.
+
 import java.util.concurrent.*;
 import java.util.*;
+
 import static net.mindview.util.Print.*;
 
 class Horse implements Runnable {
-  private static int counter = 0;
-  private final int id = counter++;
-  private int strides = 0;
-  private static Random rand = new Random(47);
-  private static CyclicBarrier barrier;
-  public Horse(CyclicBarrier b) { barrier = b; }
-  public synchronized int getStrides() { return strides; }
-  public void run() {
-    try {
-      while(!Thread.interrupted()) {
-        synchronized(this) {
-          strides += rand.nextInt(3); // Produces 0, 1 or 2
+    private static int counter = 0;
+    private final int id = counter++;
+    private int strides = 0;
+    private static Random rand = new Random(47);
+    private static CyclicBarrier barrier;
+
+    public Horse(CyclicBarrier b) {
+        barrier = b;
+    }
+
+    public synchronized int getStrides() {
+        return strides;
+    }
+
+    @Override
+    public void run() {
+        try {
+            while (!Thread.interrupted()) {
+                synchronized (this) {
+                    strides += rand.nextInt(3); // Produces 0, 1 or 2
+                }
+                barrier.await();
+            }
+        } catch (InterruptedException e) {
+            // A legitimate way to exit
+        } catch (BrokenBarrierException e) {
+            // This one we want to know about
+            throw new RuntimeException(e);
         }
-        barrier.await();
-      }
-    } catch(InterruptedException e) {
-      // A legitimate way to exit
-    } catch(BrokenBarrierException e) {
-      // This one we want to know about
-      throw new RuntimeException(e);
     }
-  }
-  public String toString() { return "Horse " + id + " "; }
-  public String tracks() {
-    StringBuilder s = new StringBuilder();
-    for(int i = 0; i < getStrides(); i++) {
-        s.append("*");
+
+    @Override
+    public String toString() {
+        return "Horse " + id + " ";
+    }
+
+    public String tracks() {
+        StringBuilder s = new StringBuilder();
+        for (int i = 0; i < getStrides(); i++) {
+            s.append("*");
+        }
+        s.append(id);
+        return s.toString();
     }
-    s.append(id);
-    return s.toString();
-  }
 }
 
 public class HorseRace {
-  static final int FINISH_LINE = 75;
-  private List<Horse> horses = new ArrayList<Horse>();
-  private ExecutorService exec =
-    Executors.newCachedThreadPool();
-  private CyclicBarrier barrier;
-  public HorseRace(int nHorses, final int pause) {
-    barrier = new CyclicBarrier(nHorses, new Runnable() {
-      public void run() {
-        StringBuilder s = new StringBuilder();
-        for(int i = 0; i < FINISH_LINE; i++) {
-            s.append("="); // The fence on the racetrack
-        }
-        print(s);
-        for(Horse horse : horses) {
-            print(horse.tracks());
-        }
-        for(Horse horse : horses) {
-            if(horse.getStrides() >= FINISH_LINE) {
-              print(horse + "won!");
-              exec.shutdownNow();
-              return;
+    static final int FINISH_LINE = 75;
+    private List<Horse> horses = new ArrayList<Horse>();
+    private ExecutorService exec =
+            Executors.newCachedThreadPool();
+    private CyclicBarrier barrier;
+
+    public HorseRace(int nHorses, final int pause) {
+        barrier = new CyclicBarrier(nHorses, new Runnable() {
+            @Override
+            public void run() {
+                StringBuilder s = new StringBuilder();
+                for (int i = 0; i < FINISH_LINE; i++) {
+                    s.append("="); // The fence on the racetrack
+                }
+                print(s);
+                for (Horse horse : horses) {
+                    print(horse.tracks());
+                }
+                for (Horse horse : horses) {
+                    if (horse.getStrides() >= FINISH_LINE) {
+                        print(horse + "won!");
+                        exec.shutdownNow();
+                        return;
+                    }
+                }
+                try {
+                    TimeUnit.MILLISECONDS.sleep(pause);
+                } catch (InterruptedException e) {
+                    print("barrier-action sleep interrupted");
+                }
             }
+        });
+        for (int i = 0; i < nHorses; i++) {
+            Horse horse = new Horse(barrier);
+            horses.add(horse);
+            exec.execute(horse);
         }
-        try {
-          TimeUnit.MILLISECONDS.sleep(pause);
-        } catch(InterruptedException e) {
-          print("barrier-action sleep interrupted");
+    }
+
+    public static void main(String[] args) {
+        int nHorses = 7;
+        int pause = 200;
+        if (args.length > 0) { // Optional argument
+            int n = new Integer(args[0]);
+            nHorses = n > 0 ? n : nHorses;
         }
-      }
-    });
-    for(int i = 0; i < nHorses; i++) {
-      Horse horse = new Horse(barrier);
-      horses.add(horse);
-      exec.execute(horse);
+        if (args.length > 1) { // Optional argument
+            int p = new Integer(args[1]);
+            pause = p > -1 ? p : pause;
+        }
+        new HorseRace(nHorses, pause);
     }
-  }
-  public static void main(String[] args) {
-    int nHorses = 7;
-    int pause = 200;
-    if(args.length > 0) { // Optional argument
-      int n = new Integer(args[0]);
-      nHorses = n > 0 ? n : nHorses;
-    }
-    if(args.length > 1) { // Optional argument
-      int p = new Integer(args[1]);
-      pause = p > -1 ? p : pause;
-    }
-    new HorseRace(nHorses, pause);
-  }
 } /* (Execute to see output) *///:~