1 2 ObjectInputStream in = new ObjectInputStream(new FileInputStream("data.obj")); Employee emp5 = (Employee) in.readObject();
1 261: invokevirtual #118 // Method java/io/ObjectInputStream.readObject:()Ljava/lang/Object;
正如我们在上面的字节码片段中看到的,4个方法都被调用并转换为 invokevirtual(对象创建由这些方法直接处理),但第一个方法被转换为两个调用:一个是 new,另一个是 invokespecial(调用构造函数)。
在我的文章中,曾经讨论过序列化和反序列化的细节,如果你想了解更多相关知识,请继续阅读:Everything About Java Serialization Explained With Example。
示例
创建对象的 Employee 类:
class Employee implements Cloneable, Serializable
private static final long serialVersionUID = 1L;
private String name
public Employee() {
System.out.println("Employee Constructor Called...");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Employee other = (Employee) obj;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
@Override
public String toString() {
return "Employee [name=" name "]";
}
// By using Class class's newInstance() method
Employee emp2 = (Employee) Class.forName("org.programming.mitra.exercises.Employee")
.newInstance();
// Or we can simply do this
// Employee emp2 = Employee.class.newInstance();
emp2.setName("Rishi");
System.out.println(emp2 ", hashcode : " emp2.hashCode());
// By using clone() method
Employee emp4 = (Employee) emp3.clone();
emp4.setName("Atul");
System.out.println(emp4 ", hashcode : " emp4.hashCode());
// By using Deserialization
// Serialization
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("data.obj"));
out.writeObject(emp4);
out.close();