corejava第10版

corejava第10版/v2ch02/serialClone/SerialCloneTest.java

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+package serialClone;
+
+/**
+ * @version 1.21 13 Jul 2016
+ * @author Cay Horstmann
+ */
+
+import java.io.*;
+import java.util.*;
+import java.time.*;
+
+public class SerialCloneTest
+{  
+   public static void main(String[] args) throws CloneNotSupportedException
+   {  
+      Employee harry = new Employee("Harry Hacker", 35000, 1989, 10, 1);
+      // clone harry
+      Employee harry2 = (Employee) harry.clone();
+
+      // mutate harry
+      harry.raiseSalary(10);
+
+      // now harry and the clone are different
+      System.out.println(harry);
+      System.out.println(harry2);
+   }
+}
+
+/**
+ * A class whose clone method uses serialization.
+ */
+class SerialCloneable implements Cloneable, Serializable
+{  
+   public Object clone() throws CloneNotSupportedException
+   {
+      try {
+         // save the object to a byte array
+         ByteArrayOutputStream bout = new ByteArrayOutputStream();
+         try (ObjectOutputStream out = new ObjectOutputStream(bout))
+         {
+            out.writeObject(this);
+         }
+
+         // read a clone of the object from the byte array
+         try (InputStream bin = new ByteArrayInputStream(bout.toByteArray()))
+         {
+            ObjectInputStream in = new ObjectInputStream(bin);
+            return in.readObject();
+         }
+      }
+      catch (IOException | ClassNotFoundException e)
+      {  
+         CloneNotSupportedException e2 = new CloneNotSupportedException();
+         e2.initCause(e);
+         throw e2;
+      }
+   }
+}
+
+/**
+ * The familiar Employee class, redefined to extend the
+ * SerialCloneable class. 
+ */
+class Employee extends SerialCloneable
+{  
+   private String name;
+   private double salary;
+   private LocalDate hireDay;
+
+   public Employee(String n, double s, int year, int month, int day)
+   {  
+      name = n;
+      salary = s;
+      hireDay = LocalDate.of(year, month, day);
+   }
+
+   public String getName()
+   {
+      return name;
+   }
+
+   public double getSalary()
+   {
+      return salary;
+   }
+
+   public LocalDate getHireDay()
+   {
+      return hireDay;
+   }
+
+   /**
+      Raises the salary of this employee.
+      @byPercent the percentage of the raise
+   */
+   public void raiseSalary(double byPercent)
+   {  
+      double raise = salary * byPercent / 100;
+      salary += raise;
+   }
+
+   public String toString()
+   {  
+      return getClass().getName()
+         + "[name=" + name
+         + ",salary=" + salary
+         + ",hireDay=" + hireDay
+         + "]";
+   }
+}