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());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 without using reverse function
// Reverse a string in java without using reverse function
import java.util.Scanner;
public class ReverseWithoutFunction
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Please enter a string: ");
String strInput = sc.nextLine();
int len = strInput.length();
String strReverse = "";
System.out.println("Reverse a string without using reverse function: ");
for(int a = len - 1; a >= 0; a--)
{
strReverse = strReverse + strInput.charAt(a);
}
System.out.println(strReverse);
sc.close();
}
}Java reverse string array
// reverse string array in java using collections
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class ReverseStringArrayUsingCollections
{
public static void main(String[] args)
{
// creating list of strings
List<String> li = new ArrayList<String>();
li.add("java");
li.add("core");
li.add("world");
li.add("hello");
System.out.println("Given list: " + li);
Collections.reverse(li);
System.out.println("After using collections: " + li);
}
}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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