java reverse a string
// Library approach
public static String solution(String str) {
// StringBuilder is not thread-safe, use StringBuffer
return new StringBuffer(str).reverse().toString();
}
// DIY approach
public static String solution(String str) {
char[] chars = str.toCharArray();
for(int i = 0, j = str.length() - 1; i < j; i++, j--) {
char ch = chars[i];
chars[i] = chars[j];
chars[j] = ch;
}
return new String(chars);
}java string reverse
String str = "Reverse this strings";
//for loop
for (int i = str.length() - 1; i >= 0; i--) {
System.out.print(str.charAt(i));
}
// StringBuffer for multi thread
StringBuffer sb = new StringBuffer();
sb.append(str);
System.out.print(sb.reverse().toString());
// StringBuffer for single thread
StringBuilder sb = new StringBuilder();
sb.append(str);
System.out.print(sb.reverse().toString());Copyright © 2021 Codeinu
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