42 lines
959 B
Java
42 lines
959 B
Java
package strings;
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/** Reverse String using different version */
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public class ReverseString {
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public static void main(String[] args) {
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assert reverse("abc123").equals("321cba");
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assert reverse2("abc123").equals("321cba");
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}
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/**
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* easiest way to reverses the string str and returns it
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*
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* @param str string to be reversed
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* @return reversed string
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*/
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public static String reverse(String str) {
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return new StringBuilder(str).reverse().toString();
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}
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/**
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* second way to reverses the string str and returns it
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*
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* @param str string to be reversed
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* @return reversed string
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*/
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public static String reverse2(String str) {
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if (str == null || str.isEmpty()) {
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return str;
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}
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char[] value = str.toCharArray();
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for (int i = 0, j = str.length() - 1; i < j; i++, j--) {
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char temp = value[i];
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value[i] = value[j];
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value[j] = temp;
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}
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return new String(value);
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}
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}
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