Most Common Core Java String Coding Interview Question | Leetcode| String Rotation |Code Decode

In this video of code decode we have explained find if one string is a rotation of another i.e. string rotation problem. It is the most commonly asked core java string interview question and answer

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given a string = "decode"
left rotation of string with 2 characters is = "codede"
right rotation of string with 2 characters is "dedeco"

To find if one string is rotation of another String by using a solution- is to concatenate s1 with itself. s2 is a rotation of s1 if and only if it is a substring of the rotated string. In java we can either use string contains or indexOf to check for substring.

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[refreshjavabysaikaruturi]

Very clear and easy explanation, Thank you so much

[qaimmahdi]

private static void leftShift(String str, int r) {

String outputString = str.substring(r) + str.substring(0, r);


}

private static void rightShift(String str, int r) {
int partition = str.length() - r;
leftShift(str, partition);

}

[akashsaha]

Thank you very much maam. Looking forward for some hard ds, algo questions from codeforge or leetcode for our interview.

[littlegenius]

Just an additional comment..
We should also add length check that both strings are of same length to handle false positive for smaller string

[ig_haxie]

public void rotate(String str, int n, boolean left){
If(left==true){
System.out.println(str.subString(n)+str.subString(0, n));}
else System.out.println(str.subString(str.length()-1-n, str.length()-1) + str.subString(0, str.length()-1-n);
}

[ruchigupta]

Can you please create a detailed video on java concurrent package. Now a days most of the interviewers are asking questions from this topic.

[suparnasuresh]

Thank you so much for your great work.!! All videos are simple and in detail...
Could you please make a video to find maximum sum from an array/arraylist which contains +ve and -ve values.

[andresfelipecardonagutierr]

You should the length of the "rotated" word and also check is not the same word. As it is decode will also return true as if it was a rotated word from decode which is not. Also de should return true and it is not a rotation of the word.

[karnataka]

Thank you so much mam. Your explanation is very clearly.

[vengateshm]

Excellent explanation. Thanks for sharing.

[thulasiraman]

public class RotateLeftAndRight {
public static void main(String[] args) {

// Rotate by left
System.out.println(leftRotate("Hello", 2));

// Rotate by right
System.out.println(rightRotate("Hello", 2));

// Using left rotation to get the right rotation
// Left rotation - 2
// Right rotation - 2 ~ Left Rotation (total length - 2)
System.out.println(rightRotateUsingLeftRotation("Hello", 2));
}

private static String word, int r) {
System.out.print("Right roation using ");
return leftRotate(word, word.length() - r);
}

public static String leftRotate(String word, int r) {
System.out.println("Left Rotation by " + r);
return word.substring(r) + word.substring(0, r);
}

public static String rightRotate(String word, int r) {
System.out.println("Right Rotation by " + r);
int index = word.length() - r;
return word.substring(index) + word.substring(0, index);
}
}

[sreedattakandinalli]

Thank you, please also make some tutorials in solving the leetcode questions

[akshaykohale]

Please make one video on How to call stored procedure in spring boot

[ashwinis.]

Can you please make a vedio on object lock and class level lock

[trendinggadgets]

Dear mam please restart aws series ASAP.