CareerCup

Can you please explain what is expected when two strings are given, I mean what kind of comparison is expected?

Yes, you would also need to check if the references of the strings are same!

For example String str1 = new "Hello";
String str2 = str1;

In this case too, the strings are equal.

I was not able to figure out how to do the locale part, any idea how to tackle that?

C version:
Returns 0 if strings are same else non-zero value.

int my_strcmp ( char *s, char *t ) {
	while ( *s == *t ) {
		if ( *s == '\0' )
			return 0 ;
			
		s++ ;
		t++ ;
	}
	return ( *s - *t ) ;
}

what are the cases we should consider during string comparison?

if(str1==null&&str2==null) return true;
if(str1==null||str2==null) return false;
if(str1.length()!=str2.length()) return false;
int index1=0;
int index2=0;
while(index1<str1.length() && index2<str2.length()) {
if(str1.charAt(index1)!=str2.charAt(index2)) return false;
index1++;
index2++;
}
return true;

public static void main(String[] args) {
		String str1 = "Hello";
		String str2 = "Hello";
		int found = 1;
		if (str1.length() == str2.length()) {
			for (int i = 0; i < str1.length(); i++) {
				if (str1.charAt(i) == str2.charAt(i)) {
					continue;
				} else {
					found = 0;
				}
			}
			if (found == 0) {
				System.out.println("Not Equal Strings");
			}else{
				System.out.println("Hurray the strings are equal");
			}

		} else {
			System.out.println("Not Equal Strings");
		}
	}

This should the faster then the previous solution :

public static void main(String[] args) {
		String str1 = "Hello";
		String str2 = "Heleo";
		System.out.println((str1 != null) && (str2 != null)
				&& (str1.hashCode() == str2.hashCode()) && str1.equals(str2));
	}

This should the faster then the previous solution :

public static void main(String[] args) {
		String str1 = "Hello";
		String str2 = "Heleo";
		System.out.println((str1 != null) && (str2 != null)
				&& (str1.hashCode() == str2.hashCode()) && str1.equals(str2));
	}

1.read each char from first string put it in map(key will be index and value will be that char)
2.read each char from second string and read char from map as well for that index
3. if both char are not same return false;
4 and at the end if map size and second string size are not same return false;
5 return true