java.io.ObjectInputStream.getField.getObjectStreamClass()方法實例

java.io.ObjectInputStream.getField.getObjectStreamClass() 方法獲取描述流中的字段中的ObjectStreamClass。

聲明

以下是java.io.ObjectInputStream.getField.getObjectStreamClass()方法聲明

public abstract ObjectStreamClass getObjectStreamClass()

參數

• NA

返回值

此方法返回一個描述序列化字段的描述符類

異常

• NA

例子

下面的例子顯示了使用ofjava.io.ObjectInputStream.getField.getObjectStreamClass()的方法。

package com.yiibai; import java.io.*; public class ObjectInputStreamDemo implements Serializable { public static void main(String[] args) { try { // create a new file with an ObjectOutputStream FileOutputStream out = new FileOutputStream("test.txt"); ObjectOutputStream oout = new ObjectOutputStream(out); // write something in the file oout.writeObject(new Example()); oout.flush(); oout.close(); // create an ObjectInputStream for the file we created before ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt")); // read an object from the stream and cast it to Example Example a = (Example) ois.readObject(); // print var of a System.out.println("" + a.var); // get and print the objectStreamClass System.out.println("" + a.v); } catch (Exception ex) { ex.printStackTrace(); } } static public class Example implements Serializable { static String var = "Hello World"; static ObjectStreamClass v; // assign a new serialPersistentFields private static final ObjectStreamField[] serialPersistentFields = { new ObjectStreamField("var", String.class) }; private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { // get the field and assign it at var ObjectInputStream.GetField fields = in.readFields(); // get var var = (String) fields.get("var", "reset"); v = fields.getObjectStreamClass(); } private void writeObject(ObjectOutputStream out) throws IOException { // write into the ObjectStreamField array the variable string ObjectOutputStream.PutField fields = out.putFields(); fields.put("var", var); out.writeFields(); } } }

讓我們編譯和運行上面的程序，這將產生以下結果：

Hello World com.yiibai.ObjectInputStreamDemo$Example: static final long serialVersionUID = 1534274623819585475L;