corejava第8版

corejava第8版/v1ch06/StaticInnerClassTest/StaticInnerClassTest.java

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+/**
+ * This program demonstrates the use of static inner classes.
+ * @version 1.01 2004-02-27
+ * @author Cay Horstmann
+ */
+public class StaticInnerClassTest
+{
+   public static void main(String[] args)
+   {
+      double[] d = new double[20];
+      for (int i = 0; i < d.length; i++)
+         d[i] = 100 * Math.random();
+      ArrayAlg.Pair p = ArrayAlg.minmax(d);
+      System.out.println("min = " + p.getFirst());
+      System.out.println("max = " + p.getSecond());
+   }
+}
+
+class ArrayAlg
+{
+   /**
+    * A pair of floating-point numbers
+    */
+   public static class Pair
+   {
+      /**
+       * Constructs a pair from two floating-point numbers
+       * @param f the first number
+       * @param s the second number
+       */
+      public Pair(double f, double s)
+      {
+         first = f;
+         second = s;
+      }
+
+      /**
+       * Returns the first number of the pair
+       * @return the first number
+       */
+      public double getFirst()
+      {
+         return first;
+      }
+
+      /**
+       * Returns the second number of the pair
+       * @return the second number
+       */
+      public double getSecond()
+      {
+         return second;
+      }
+
+      private double first;
+      private double second;
+   }
+
+   /**
+    * Computes both the minimum and the maximum of an array
+    * @param values an array of floating-point numbers
+    * @return a pair whose first element is the minimum and whose second element
+    * is the maximum
+    */
+   public static Pair minmax(double[] values)
+   {
+      double min = Double.MAX_VALUE;
+      double max = Double.MIN_VALUE;
+      for (double v : values)
+      {
+         if (min > v) min = v;
+         if (max < v) max = v;
+      }
+      return new Pair(min, max);
+   }
+}