rotation of string in java

• An easy solution to verify rotation of strings is find occurences of String1 in String2.
• By using concat and contains we can verify rotation of given strings.

Program for rotation of strings using contains:

public class StringRotation {
    public static void main(String[] args) {
        String str1 = "ABCD";
        String str2 = "CDAB";

        if (str1.length() == str2.length() && (str1 + str1).contains(str2)) {
            System.out.println("given strings are rotation");
        } else {
            System.out.println("given strings are not rotation");
        }
    }
}

Output:

rotation of string in java

Program for rotation of strings using indexOf():

public class StringRotation {
    public static void main(String[] args) {
        String str1 = "ABAD";
        String str2 = "ADAB";

        if (str1.length() == str2.length() && (str1 + str1).indexOf(str2)!=-1) {
           System.out.println("given strings are rotation");
        } else {
            System.out.println("given strings are not rotation");
        }
    }
}
Output:
rotation of string in java
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