length of longest palindrome subsequence code example

Example: longest palindromic subsequence

public int longestPalindromeSubseq(String s) {
        String s2=reverse(s);
        int n=s.length();
        int m=s2.length();
        int dp[][]=new int[n+1][m+1];
        for(int i=0;i<=n;i++)
        {
            for(int j=0;j<=m;j++)
            {
                if(i==0 || j==0)
                {
                    dp[i][j]=0;
                }
                else
                {
                    if(s.charAt(i-1)==s2.charAt(j-1))
                        dp[i][j]=1+dp[i-1][j-1];
                    else
                    {
                        dp[i][j]=Math.max(dp[i-1][j],dp[i][j-1]);
                    }
                }
            }
        }
        return dp[n][m];
    }
}