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);
}String reverse in java
1)
String str = "Hello";
String result = "";
for(int i = str.length()-1; i>=0; i--){
result += str.charAt(i); // first solution, charAt method
// result += str1.substring(i, i+1); // first solution, substring method
}
System.out.println(result);
}reverse a string in java
public class Main {
public static void main(String[] args) {
// Write a Java program to reverse a string.
Scanner input = new Scanner(System.in);
System.out.println("Enter the String:");
char[] letters = input.nextLine().toCharArray();
System.out.println(" Reverse String");
for(int i = letters.length -1; i >= 0; i--){
System.out.print(letters[i]);
}
}
}Copyright © 2021 Codeinu
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