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);
}Reverse a string in java
// reverse a string using reverse() method of StringBuilder class
class ReverseUsingReverseMethod
{
public static void main(String[] args)
{
String str = "Hello world Java";
StringBuilder sb = new StringBuilder();
// append string to StringBuilder
sb.append(str);
sb = sb.reverse();
// printing reversed String
System.out.println(sb);
}
}string reverse in java
String str = "Hello";
String reverse(String str){
StringBuilder sb = new StringBuilder();
sb.append(str);
sb.reverse();
return sb.toString();
}reverse string array java
//java program to reverse array using for loop
public class ReverseArrayDemo
{
public static void main(String[] args)
{
int[] arrNumbers = new int[]{2, 4, 6, 8, 10};
System.out.println("Given array: ");
for(int a = 0; a < arrNumbers.length; a++)
{
System.out.print(arrNumbers[a] + " ");
}
System.out.println("Reverse array: ");
// looping array in reverse order
for(int a = arrNumbers.length - 1; a >= 0; a--)
{
System.out.print(arrNumbers[a] + " ");
}
}
}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);
}Copyright © 2021 Codeinu
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