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Core Java - Interview Questions and Answers for 'String manipulation' - 3 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 recursivelyCore Java

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);
}

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   Like         Discuss         Correct / Improve     string  StringBuffer  recursion  for loop  control statements  loop statement  stringbuffer.append  java.lang.String  java.lang.StringBuffer  String Manipulation     Asked in 8 Companies        frequent


 Q2. Suppose we have a string "Java is object oriented language" and we have to reverse every alternate word in string. How would we do that using Java program.Core Java2017-09-06 20:29:59

 This question was recently asked at 'datalake solutions'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     string manipulation  code  coding     Asked in 1 Companies


 Q3. Write a Program to right shift single character in a string2017-08-24 20:12:56

Ans. public class RightShiftCharacter {
   public static void main(String args[]) {
      String str = "Hello";
      
      char[] charArray = str.toCharArray();
      
      for(int count=charArray.length-1;count>0;count--){
         charArray[count] = charArray[count-1];
      }
      
      String newString = new StringBuilder().append(charArray).toString();
      
      System.out.println(newString);      
   }
}

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