java.io.ObjectOutputStream.PutField.put(String name, boolean val)方法實例

java.io.ObjectOutputStream.PutField.put(String name, boolean val) 方法把指定的布爾字段的值放到持久性字段。

Declaration

以下是java.io.ObjectOutputStream.PutField.put()方法的聲明

public abstract void put(String name, boolean val)

參數

• name -- 可序列化字段的名稱

• val -- 分配給字段的值

返回值

此方法無返回值。

異常

• IllegalArgumentException -- 如果名稱不匹配序列化的字段正被寫入，或者指定字段的類型不是布爾型的類的名稱

例子

下面的示例演示java.io.ObjectOutputStream.PutField.put()方法的用法。

package com.yiibai; import java.io.*; public class ObjectOutputStreamDemo 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); } catch (Exception ex) { ex.printStackTrace(); } } static public class Example implements Serializable { static boolean var = false; // assign a new serialPersistentFields private static final ObjectStreamField[] serialPersistentFields = { new ObjectStreamField("var", Boolean.TYPE) }; private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { // get the field and assign it at var ObjectInputStream.GetField fields = in.readFields(); // get var var = fields.get("var", true); } private void writeObject(ObjectOutputStream out) throws IOException { // write into the ObjectStreamField array the variable var 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：

false