Pages

Reverse a String in java

1.//Program to write  reverse a string



public class Reverse {
public static void main(String[] args) {

String s="abcd";
String rs="";
for (int i=s.length()-1;i>=0;i--){
rs=rs+s.charAt(i);
}
System.out.println(s);
System.out.println(rs);
}
}

OutPut :

abc
cba

2. Using StringBuffer(String string) method, reverse the buffer and then converts the buffer into a String with the help of toString()


public class StringReverseExample{
   public static void main(String[] args){
      String string="abcdef";
      String reverse = new StringBuffer(string).
      reverse().toString();
      System.out.println("\nString before reverse:
      "+string);
      System.out.println("String after reverse:
      "+reverse);
   }
}

3. Another  


public class Reverse {

public String reverseString(String s){
if (s.length()<=1){
return s;
}
else 
{
char c=s.charAt(0);
return reverseString(s.substring(1))+c;
}
}
}

class StringReverse{
public static void main(String[] args){
Reverse r=new Reverse();
String s1="abcde";
System.out.println("Given String="+ (s1));
System.out.println("Reverse String="+ r.reverseString(s1));
}
}

Output:

Given String=abcde
Reverse String=edcba

4. String Input from Keyword 


import java.util.Scanner;
public class A {

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter the String : ");
String value=sc.nextLine();
int len = value.length();
char[] ch = new char[len];
for(int i = 0;i<len;i++)
{
ch[i]= value.charAt(len-1-i);
}
String result = new String (ch);
System.out.println(result);
}
}


No comments:

Post a Comment