对象输入、输出流与序列化
保存和加载序列化对象(P66-67)
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("employee.dat"));Employee harry = new Employee("Harry Hacker",50000,1989,10,1);
out.writeObject(harry);ObjectInputStream in = new ObjectInputStream(new FileInputStream("employee.dat"));Employee e1 = (Employee) in.readObject();序列化技术(P67)
API(P70)
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