Answer Posted / kshama varshney

There are two ways---
1)When we set session time out in WEB.xml then session will
be automatically expire if nothing is happening after given
time period
2)if we are using "session.invalidate" function then after
executing this function session will be expire.

Why java is called not pure object oriented language?

1077

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Which collection is thread safe in java?

1040

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what is method reference in java 8?

1094

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What is protected in java?

1047

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What is parsing in java?

1015

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What technique is carried out to find out if a particular string is empty?

1064

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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". } } }

1842

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What is the common usage of serialization? What exceptions occur during serialization?

1201

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What is the += operator called?

1103

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Name few java 8 annotations ?

1087

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2) Suppose there are 5 directories having lot of files (say txt files) in each directory. 2 things :- 2.1) You want to search for filenames which have a particular pattern. 2.2) Out of these filtered files you want to search for a particular keyword or a search string. How can you achieve this?

2327

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Describe the process as to how substring() methodology mechanisms in java.

1208

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Why do we need hashmap in java?

1178

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Explain about strings in java?

1129

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Why do we use variables?

1048

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