41 lines
1.1 KiB
Java
41 lines
1.1 KiB
Java
package com.dsa;
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import java.util.Arrays;
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import java.util.Collections;
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public class ReverseString {
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public static void main(String[] args) {
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StringBuilder s = new StringBuilder("latte");
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String ans = reverse(s, 0, s.length() - 1);
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System.out.println(ans);
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//another way
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String s1 = "hiii";
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char arr[] = s1.toCharArray();
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char ans2[] = reverse2(arr, 0, arr.length - 1);
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String a = String.valueOf(ans2);
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System.out.println(a);
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}
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static char[] reverse2(char[] arr, int start, int end) {
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if (start > end) {
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return arr;
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}
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char temp = arr[start];
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arr[start] = arr[end];
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arr[end] = temp;
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return reverse2(arr, start + 1, end - 1);
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}
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static String reverse(StringBuilder s, int start, int end) {
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if (start > end) {
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return s.toString();
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}
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char temp = s.charAt(end);
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s.setCharAt(end, s.charAt(start));
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s.setCharAt(start, temp);
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return reverse(s, start + 1, end - 1);
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}
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}
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