Core java - Interview Questions and Answers for 'Hitachi' - 3 question(s) found - Order By Newest Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS) Q1. Explain the scenerios to choose between String , StringBuilder and StringBuffer ? Core Java
Ans. If the Object value will not change, use String Class because a String object is immutable. Sample Code for String Sample Code for StringBuffer Sample Code for StringBuilder Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 29 Companies basic frequent Related Questions Difference between == and .equals() ? Why is String immutable in Java ? Why Char array is preferred over String for storing password? What are different ways to create String Object? Explain. What is a String Pool ? How does making string as immutable helps with securing information ? How does String Pool pose a security threat ? How is string object immutable if we can concat a string to it ? What is StringJoiner ? Which of the following is false about main method ? Q2. Write a method to check if input String is Palindrome? Core Java
Ans. private static boolean isPalindrome(String str) { Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 38 Companies Basic frequent Related Questions Which keyword is used to provide explicit access of a code block to single thread ? How does volatile affect code optimization by compiler? Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? What is the difference between the following two code lines ? Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? If arrays cannot be resized , Why is this code valid Will the static block be executed in the following code ? Why ? If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ? Which of the following is not the advantage of Mocking frameworks ? How can we make sure that a code segment gets executed even in case of uncatched exceptions ? Q3. Write a Program to find number of lines , words and characters in a File. Core Java
Ans. import java.io.BufferedReader; Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 2 Companies Related Questions Which keyword is used to provide explicit access of a code block to single thread ? How does volatile affect code optimization by compiler? Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ? What is the difference between the following two code lines ? Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object? If arrays cannot be resized , Why is this code valid Will the static block be executed in the following code ? Why ? If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ? Which of the following is not the advantage of Mocking frameworks ? How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
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Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS)
java string class string stringbuilder stringbuffer String vs StringBuffer String vs StringBuilder String vs StringBuilder vs StringBuffer StringBuffer vs stringBuilder 
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Which of the following has been introduced with Java 8 ?
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