Core Java - Interview Questions and Answers for 'Java.lang' | Search Java Interview Question

Core Java - Interview Questions and Answers for 'Java.lang' - 5 question(s) found - Order By Newest

Very frequently asked in HCL Tech ( Based of 4 inputs )

Q1. Write a Program to reverse a string iteratively and recursively

Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character.

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve string StringBuffer recursion for loop control statements loop statement stringbuffer.append java.lang.String java.lang.StringBuffer String Manipulation HCL Technologies Ocado BlackRock Oracle FINRA Arezzo Sky Zalando Boeing frequent}

Q2. Do we need to import java.lang package ?

Core Java

^Anonymous

Ans. No, It is loaded by default by the JVM.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java jvm java.lang.package yes-no}

Q3. Name few classes that are part of java.lang package ?

^{Admin
info@buggybread.com}

Ans. http://www.buggybread.com/2015/01/java-javalang-classes-and-interfaces.html

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java.lang}

Rarely asked as it was introduced with Java 8.

Q4. Name few java.lang classes introduced with Java 8 ?

Core Java

^{Admin
info@buggybread.com}

Ans. http://www.buggybread.com/2015/01/migrating-to-java-8-new-classes.html

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java.lang java8 java 8}

Q5. Which java package is loaded by default and hence doesn't require an explicit import statement ?

Core Java

^{2017-06-23 08:10:46}

Ans. java.lang

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java.lang import statement basic}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.