ObjectStreamClass类的getField()方法 (ObjectStreamClass Class getField() method)
getField() method is available in java.io package.
getField()方法在java.io包中可用。
getField() method is used to return the field of this ObjectStreamClass by the given field name (fi_na).
getField()方法用于通过给定的字段名称(fi_na)返回此ObjectStreamClass的字段。
getField() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
getField()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
getField() method does not throw an exception at the time of returning named field.
返回命名字段时， getField()方法不会引发异常。
Syntax:
句法：
public ObjectStreamField getField(String fi_na);
Parameter(s):
参数：
String fi_na – represents the name of the returned field.
字符串fi_na –表示返回字段的名称。
Return value:
返回值：
The return type of the method is ObjectStreamField, it returns the ObjectStreamField object of the named field when exists otherwise it returns null when no named field exists.
该方法的返回类型为ObjectStreamField ，如果存在，它将返回命名字段的ObjectStreamField对象，否则，如果不存在命名字段，则返回null。
Example:
例：
// Java program to demonstrate the example
// of ObjectStreamField getField(String fi_na)
// method of ObjectStreamClass
import java.io.*;
import java.util.*;
public class GetField {
public static void main(String[] args) {
// Instantiates ObjectStreamClass for
// and Calendar
ObjectStreamClass o_stm = ObjectStreamClass.lookup(Calendar.class);
// By using getField() method is to return
// the field of this class by name
ObjectStreamField o_sf1 = o_stm.getField("isTimeSet");
ObjectStreamField o_sf2 = o_stm.getField("fields");
// Display o_sf1, o_sf2
System.out.println("o_stm.getField(isTimeSet): " + o_sf1);
System.out.println("o_stm.getField(fields): " + o_sf2);
}
}
Output
输出量
o_stm.getField(isTimeSet): Z isTimeSet
o_stm.getField(fields): [I fields
翻译自: https://www.includehelp.com/java/objectstreamclass-getfield-method-with-example.aspx