Reverse String in Java
We have given a string and we have to reverse a string in Java programming languages. There can be various approaches to reverse a string in java. The best way to Reverse string in java are as follow:
Program to reverse a String In java
This program will reverse each word of string in java.
Input -: " This is Courpedia website ".
OutPut -: "website Courpedia is This".
Source code-: 👇👇👇
Note- Package name = MyCode
package MyCode;
import java.util.*;
public class Reverse {
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
System.out.println("enter the String");
String name = sc.nextLine();
int i =name.length()-1;
String ans="";
while(i>=0)
{
while(i>=0 && name.charAt(i)==' ')i--;
int k=i;
if(i<0)break;
while(i>=0 && name.charAt(i)!=' ')i--;
if(ans.isEmpty())
{
ans=ans.concat(name.substring(i+1,k+1));
}else
{
ans=ans.concat( " " +name.substring(i+1,k+1));
}
}
System.out.println(ans);
}
}
Program to reverse a string by each character in java
Input:- " Reverse string in Java"
Output -: "avaJ ni gnirts esreveR"
Source Code:- 👇👇
package MyCode;
import java.util.Scanner;
public class Revera {
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
String S;
System.out.println("enter string");
String name = sc.nextLine();
int n= name.length()-1;
for(int i=0;i<=n;i++)
{
System.out.print(name.charAt(i));
}
System.out.println();
//reverse the string now
for(int j=n;j>=0;j--)
{
System.out.print(name.charAt(j));
}
}
}
Reverse string in java using String Builder and StringBuffer
package MyCode;
import java.util.Scanner;
public class Revera {
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
System.out.println("enter string");
String str = sc.nextLine();
StringBuilder sb = new StringBuilder(str);
System.out.println(sb.reverse().toString());
}
}
You can reverse a string in Java in some other ways also. You should try to do a question in different ways to learn more about the core concepts of programming languages.
Also, Read -: [ Java Programming Interview questions ]
