Answer Posted / rajasekharreddy.y

Yes abstract class must have the constructor, these
constructor we can achive by creating the instance of the
concreate subclass of the abstract class.

Explain the difference between serializable and externalizable in java?

1135

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What is covariant return type?

1155

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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". } } }

1841

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How will you initialize an Applet?

1201

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What is the use of callablestatement?

1057

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Why does it take so much time to access an applet having swing components the first time?

1987

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What is class and its types?

1102

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Explain the difference between call by refrence and call by value?

1073

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What is t type java?

1107

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Why do we need hashset in java?

1094

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Do we have pointers in java?

1070

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What is the difference between static class and normal class?

1086

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What is the meaning of immutable regarding string?

1009

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What is java beans?

1050

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What are voids?

1019

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