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 character array
class ReverseUsingCharacterArray
{
public static void main(String[] args)
{
String str = "HelloWorldJava";
char[] ch = str.toCharArray();
for(int a = ch.length - 1; a >= 0; a--)
System.out.print(ch[a]);
}
}reverse a string in java
Solution 1
public static String StrReverse(String str) {
String reverse="";
for(int i=str.length()-1; i >= 0; i--)
reverse += str.toCharArray()[i];
return reverse;
}
Solution 2 (using string buffer)
public static String Reverse(String str) {
return new StringBuffer(str).reverse().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();
}
}Copyright © 2021 Codeinu
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