Revesring a string with arrays

ReverseStringWithArray.java

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// convert String to array of chars
char[] s = str.toCharArray();

// get length of string
int n = s.length;

// get middle of string
int middle = n/2;

// swap characters in the array
for(int i = 0; i< middle; i++){
	char tmp = s[i];
	s[i] = s[n-1-i];
	s[n-1-i] = tmp;
}

// print reversed string
System.out.println(new String(s));

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