Java ObjectStreamClass forClass（）方法与示例

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ObjectStreamClass类的forClass()方法 (ObjectStreamClass Class forClass() method)

forClass() method is available in class="w3-codespan">class="tags" href="/tags/JAVA.html" title=java>java.io package.
class="raw_b_node">forClass()方法在class="tags" href="/tags/JAVA.html" title=java>java.io包中可用。
forClass() method is used to return the Class in the local virtual machine that this version is associated with.
class="raw_b_node">forClass()方法用于在与此版本关联的本地虚拟机中返回Class。
forClass() 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.
class="raw_b_node">forClass()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。
forClass() method does not throw an exception at the time of returning Class.
在返回Class时， class="raw_b_node">forClass()方法不会引发异常。

Syntax:

class="raw_b_node">句法：

class="has">    public Class forClass();

Parameter(s):

class="raw_b_node">参数：

It does not accept any parameter.
它不接受任何参数。

Return value:

class="raw_b_node">返回值：

The return type of the method is class="w3-codespan">Class, it returns the class instance that this descriptor denotes or may returns null when there is no desired local class.

方法的返回类型为Class ，它返回此描述符表示的类实例，或者在没有所需的本地类时可以返回null。

Example:

class="raw_b_node">例：

class="has">// Java program to demonstrate the example 
// of Class forClass() method of ObjectStreamClass

import class="tags" href="/tags/JAVA.html" title=java>java.io.*;

public class ForClass {
 public static void main(String[] args) {
  // Instantiates two ObjectStreamClass for Long
  // and Calendar
  ObjectStreamClass o_stm1 = ObjectStreamClass.lookup(Long.class);
  ObjectStreamClass o_stm2 = ObjectStreamClass.lookup(String.class);

  // By using forClass() method is to return
  // the class that the version is linked to
  Class cl1 = o_stm1.forClass();
  Class cl2 = o_stm2.forClass();

  // Display cl1 and cl2
  System.out.println("o_stm1.forClass(): " + cl1);
  System.out.println("o_stm2.forClass(): " + cl2);
 }
}

Output

class="raw_b_node">输出量

class="has">o_stm1.forClass(): class class="tags" href="/tags/JAVA.html" title=java>java.lang.Long
o_stm2.forClass(): class class="tags" href="/tags/JAVA.html" title=java>java.lang.String