Java.io.ObjectStreamClass.lookup() Method

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Description

The java.io.ObjectStreamClass.lookup(Class<?> cl) method finds the descriptor for a class that can be serialized. Creates an ObjectStreamClass instance if one does not exist yet for class. Null is returned if the specified class does not implement java.io.Serializable or java.io.Externalizable.

Declaration

Following is the declaration for java.io.ObjectStreamClass.lookup() method

public static ObjectStreamClass lookup(Class<?> cl)

Parameters

  • cl -- class for which to get the descriptor

Return Value

This method returns the class descriptor for the specified class

Exception

  • NA

Example

The following example shows the usage of java.io.ObjectStreamClass.lookup() method.

package com.tutorialspoint;

import java.io.*;
import java.util.Calendar;

public class ObjectStreamClassDemo {

   public static void main(String[] args) {

      // create a new object stream class for Integers
      ObjectStreamClass osc = ObjectStreamClass.lookup(Integer.class);

      // get the name for Integers
      System.out.println("" + osc.getName());

      // create a new object stream class for Calendar
      ObjectStreamClass osc2 = ObjectStreamClass.lookup(Calendar.class);

      // get the name for Calendar
      System.out.println("" + osc2.getName());
   }
}

Let us compile and run the above program, this will produce the following result:

java.lang.Integer
java.util.Calendar



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