check palindrome string in java

/**
 * @author lautturi.com
 * Java example: determine whether a string is a palindrome string in java
 */
import java.util.*;

public class Lautturi {

	public static boolean isPalindrome(String str){  
	    StringBuilder sb=new StringBuilder(str);  
	    sb.reverse();  
	    String rev=sb.toString();  
	    if(str.equals(rev)){  
	        return true;  
	    }else{  
	        return false;  
	    }  
	}  
	public static void main(String[] args) {

		String str = "abccba";
		if (isPalindrome(str))
			System.out.println("The string is a palindrome string");
	}
}

output:

The string is a palindrome string