java - Serializing an anonymous class's function does not work correctly -

summary

when try serialize anonymous function (which includes method) - doesn't seem serialize correctly.

problem

i have interface: program implements serializable , contains function void run(); main method creates variable: p , makes type program.

to "initialize" this, create anonymous class interface. in there run() method. type this: system.out.println("hello world, test");

i have class programio uses objectoutput , objectinput streams read , write these files.

writing works, reading - until start reading programio (from: program p = new program {...} program p = programio.readprogram(...) } when it's - reading , writing doesn't work. (writing shouldn't reading should)

this error: java.lang.classnotfoundexception: main$2

hypotheses

i believe problem occuring because it's looking code inside main class. why want know how can fix this.

code

import java.io.fileinputstream; import java.io.fileoutputstream; import java.io.ioexception; import java.io.objectinputstream; import java.io.objectoutputstream;  public class programio {  public static void saveprogram(string path, program d) {     try {         fileoutputstream e = new fileoutputstream(path);         objectoutputstream os = new objectoutputstream(e);         os.writeobject(d);         os.close();         e.close();     } catch (ioexception var4) {         var4.printstacktrace();     }  }  public static void autosaveprogram(string path, program d) {     try {         fileoutputstream fs = new fileoutputstream(path);         objectoutputstream os = new objectoutputstream(fs);         os.writeobject(d);         os.close();         fs.close();     } catch (ioexception var4) {      }  }  public static program readprogram(string path) {     program dbout = null;      try {         fileinputstream e = new fileinputstream(path);         objectinputstream os = new objectinputstream(e);         dbout = (program)os.readobject();         os.close();         e.close();     } catch (classnotfoundexception | ioexception var4) {         var4.printstacktrace();     }      return dbout; } } 

program.java

public interface program {  public void run(); } 

main.java (when writing)

public class main {  public static void main(string[] args) {     program p = new program() {         @override         public void run() {             system.out.println("hello world, test!");         }         };      programio.saveprogram("test.bin", p); } } 

main.java (when reading)

public class main {  public static void main(string[] args) {     program p = programio.readprogram("test.bin");   p.run(); } } 

error:

"c:\program files\java\jdk1.8.0_91\bin\java" - didea.launcher.port = 7534 "-didea.launcher.bin.path=c:\program files (x86)\jetbrains\intellij idea community edition 2016.1.1\bin" - dfile.encoding = utf - 8 - classpath "c:\program files\java\jdk1.8.0_91\jre\lib\charsets.jar;c:\program files\java\jdk1.8.0_91\jre\lib\deploy.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\access-bridge-64.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\cldrdata.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\dnsns.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\jaccess.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\jfxrt.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\localedata.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\nashorn.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\sunec.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\sunjce_provider.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\sunmscapi.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\sunpkcs11.jar;c:\program files\java\jdk1.8.0_91\jre\lib\ext\zipfs.jar;c:\program files\java\jdk1.8.0_91\jre\lib\javaws.jar;c:\program files\java\jdk1.8.0_91\jre\lib\jce.jar;c:\program files\java\jdk1.8.0_91\jre\lib\jfr.jar;c:\program files\java\jdk1.8.0_91\jre\lib\jfxswt.jar;c:\program files\java\jdk1.8.0_91\jre\lib\jsse.jar;c:\program files\java\jdk1.8.0_91\jre\lib\management-agent.jar;c:\program files\java\jdk1.8.0_91\jre\lib\plugin.jar;c:\program files\java\jdk1.8.0_91\jre\lib\resources.jar;c:\program files\java\jdk1.8.0_91\jre\lib\rt.jar;c:\users\xxxx\documents\code\test project ii\out\production\test project ii;c:\program files (x86)\jetbrains\intellij idea community edition 2016.1.1\lib\idea_rt.jar" com.intellij.rt.execution.application.appmain main java.lang.classnotfoundexception: main$2 @ java.net.urlclassloader.findclass(urlclassloader.java: 381) @ java.lang.classloader.loadclass(classloader.java: 424) @ sun.misc.launcher$appclassloader.loadclass(launcher.java: 331) @ java.lang.classloader.loadclass(classloader.java: 357) @ java.lang.class.forname0(native method) @ java.lang.class.forname(class.java: 348) @ java.io.objectinputstream.resolveclass(objectinputstream.java: 628) @ java.io.objectinputstream.readnonproxydesc(objectinputstream.java: 1620) @ java.io.objectinputstream.readclassdesc(objectinputstream.java: 1521) @ java.io.objectinputstream.readordinaryobject(objectinputstream.java: 1781) @ java.io.objectinputstream.readobject0(objectinputstream.java: 1353) @ java.io.objectinputstream.readobject(objectinputstream.java: 373) @ programio.readprogram(programio.java: 59) @ main.main(main.java: 13) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java: 62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java: 43) @ java.lang.reflect.method.invoke(method.java: 498) @ com.intellij.rt.execution.application.appmain.main(appmain.java: 144)  process finished exit code 0