Check whether two strings are rotational equal or not (rotations
of each other or not)
Given a string s1 and a string s2, check whether s2 is
a rotation of s1
s1 = WXYZ and s2 = YZWX, return
true, and
s1 = WXYZ, and s2 = XWYZ, return
false.
Solution # 1
public static boolean checkRotational(String str1, String str2) {
int length = str1.length();
if(length!=str2.length()) {
return false;
} else if(str1.equals(str2)) {
return true;
}
for(int i=1;i<length;i++) {
String s1 = str1.substring(0,1);
String s2 = str1.substring(1, length);
str1 = s2+s1;
if(str2.equals(str1)) {
return true;
}
}
return false;
}
Best Solution # 2
static boolean checkRotational(String str1, String str2) {
str1 = str1+str1;
if(str1.contains(str2)) {
return true;
} else {
return false;
}
}
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