Answer Posted / pushpendra mishra

Abstract is used in Frame work but Interface is used in specification

What are the benefits of immutable objects?

1017

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How is hashcode calculated in java?

1044

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Explain the difference between extends thread vs implements runnable in java?

1145

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Is there any way to find whether software installed in the system is registered by just providing the .exe file? I have tried the following code but its just displaying the directory structure in the registry. Here the code : package com.msi.intaller; import java.util.Iterator; import ca.beq.util.win32.registry.RegistryKey; import ca.beq.util.win32.registry.RootKey; public class RegistryFinder { public static void main(String... args) throws Exception { RegistryKey.initialize(RegistryFinder.class.getResource("jRe gistryKey.dll").getFile()); RegistryKey key = new RegistryKey(RootKey.HKLM, "Software\\ODBC"); for (Iterator subkeys = key.subkeys(); subkeys.hasNext();) { RegistryKey subkey = subkeys.next(); System.out.println(subkey.getName()); // You need to check here if there's anything which matches "Mozilla FireFox". } } }

1810

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Explain the reason behind ending a program with a system.exit(0)?

1098

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Can abstract class have private constructor?

954

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What are design patterns and please explain?

1096

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what is meant by Garbage collection?

1104

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Can a constructor be made final?

1121

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What are the approaches that you will follow for making a program very efficient?

1086

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What is append function?

1012

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Mention some features of java?

971

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How many types of memory areas are allocated by jvm?

1053

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Is java se open source?

1042

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What is a package in java? List down various advantages of packages.

1288

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