Pallindrome string code showing "Not pallindrome" even when the word is pallindrome . What's wrong in the code?

Question

package com.company;

import java.util.Locale;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String str1=sc.next();
        String temp="";
        for(int i=str1.length()-1;i>=0;i--){
            temp+= str1.charAt(i);
        }
        
        if(temp==str1){
            System.out.println("Pallindrome");
        }
        else{
            System.out.println("Not pallindrome");
        }
    }
}