How to check given String is palindrom or not in java

String is palindrom or not

import java.util.Scanner;
class StringPalindrom{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter a line");
    String str = sc.nextLine();
    String str1="";
    char ch[] = str.toCharArray();
    for(int i=ch.length-1;i>=0;i--)
    {
      str1+=ch[i];
    }
     if(str.equals(str1))
      System.out.println("Palindrom");
     else
      System.out.println("Not palindrom");
    
    
  }
}