java.io.ObjectInputStream.getField.get(String name, int val) 方法从持久字段获取指定的整型(int)字段的值。
声明
以下是java.io.ObjectInputStream.getField.get()方法声明
public abstract int get(String name, int val)
参数
-
name -- 该字段的名称
-
val -- 默认值使用,如果名称不具有值
返回值
此方法返回指定的整型字段的值
异常
-
IOException -- 如果从基础InputStream读取有I / O错误
-
IllegalArgumentException -- 如果name的类型不是可序列化的或者字段类型不正确
例子
下面的示例演示java.io.ObjectInputStream.getField.get()方法的用法。
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); } catch (Exception ex) { ex.printStackTrace(); } } static public class Example implements Serializable { static int var = 76458; // assign a new serialPersistentFields private static final ObjectStreamField[] serialPersistentFields = { new ObjectStreamField("var", Integer.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", 0); } 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(); } } }
让我们编译和运行上面的程序,这将产生以下结果:
76458