how to reverse a string in java
public class ReverseString {
public static void main(String[] args) {
String s1 = "neelendra";
for(int i=s1.length()-1;i>=0;i--)
{
System.out.print(s1.charAt(i));
}
}
}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
String str = "Hello";
String reverse(String str){
StringBuilder sb = new StringBuilder();
sb.append(str);
sb.reverse();
return sb.toString();
}Reverse a string in java
// reverse a string using toCharArray() method
class ReverseUsingToCharArrayMethod
{
public static void main(String[] args)
{
String str = "Hello World Java";
char[] chTemp = str.toCharArray();
int left, right = 0;
right = chTemp.length - 1;
for(left = 0; left < right ; left++, right--)
{
// swap values
char temp = chTemp[left];
chTemp[left] = chTemp[right];
chTemp[right]=temp;
}
for(char c : chTemp)
System.out.print(c);
System.out.println();
}
}Reverse a string in java
// reverse a string using ByteArray
class ReverseStringByteArray
{
public static void main(String[] args)
{
String input = "HelloWorld";
// getBytes() method to convert string into bytes[].
byte[] strByteArray = input.getBytes();
byte[] output = new byte[strByteArray.length];
// store output in reverse order
for(int a = 0; a < strByteArray.length; a++)
output[a] = strByteArray[strByteArray.length - a - 1];
System.out.println(new String(output));
}
}reverse a string in java
// Not the best way i know but i wanted to challenge myself to do it this way so :)
public static String reverse(String str) {
char[] oldCharArray = str.toCharArray();
char[] newCharArray= new char[oldCharArray.length];
int currentChar = oldCharArray.length-1;
for (char c : oldCharArray) {
newCharArray[currentChar] = c;
currentChar--;
}
return new String(newCharArray);
}Copyright © 2021 Codeinu
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