Java ObjectInputStream enableResolveObject() Method

The enableResolveObject () method of ObjectInputStream is used to enable the stream to replace the objects which are read from the stream. This method is called for every object being deserialized for a true value passed.

Syntax

Parameter

enable: true for allowing the use of resolveObject for every object being deserialized

Returns

The previous setting before this method was invoked.

Throws

SecurityException

Example 1

import java.io.*;
public class ObjectInputStreamenableresolveObjectExample1 extends ObjectInputStream {
   public ObjectInputStreamenableresolveObjectExample1(InputStream in) throws IOException {
      super(in);
   }

   public static void main(String[] args) {
      String s = "welcome to javaTpoint";
      
      try {
         FileOutputStream outstream = new FileOutputStream("file1.txt");
         ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
         objoutstream.writeUTF(s);
         objoutstream.flush();
         ObjectInputStreamenableresolveObjectExample1 objinstream = new ObjectInputStreamenableresolveObjectExample1(new FileInputStream("file1.txt"));

         System.out.println("" + objinstream.resolveObject(objinstream.readUTF()));
          System.out.println("enableresolveobject  :" +objinstream.enableResolveObject(true));
       } catch (Exception ex) {
         ex.printStackTrace();
      }
   }    
}

Output:

welcome to javaTpoint
enableresolveobject  :false

Example 2

package ObjectInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;

public class ObjectInputStreamresolveObjectExample2  extends ObjectInputStream {

    public ObjectInputStreamresolveObjectExample2(InputStream in)  throws IOException {
         super(in);
    }
   public static void main(String[] args) throws IOException {
      
      double[] carray = {21.0, 22.0 , 23.0 , 45.0 , 67.9 , 66.0};
      
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (double b:carray) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
               dataoutstream.flush();
         
         InputStream inpstream = new FileInputStream("file1.txt");
        DataInputStream datainpstream = new DataInputStream(inpstream);
         for(int i=0;i<=carray.length;i++){ 
            float c = datainpstream.readFloat();    
            System.out.print("    "+c);
         }
      } catch(Exception e) {
      } 
   }
}

Output:

2.828125    0.0    2.84375    0.0    2.859375    0.0    3.1015625

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