java一个final关键字的问题

这段代码为什么输出结果是那样的，难道java不是一步步往下执行吗？

 public class Test {
    public static void main(String[] args)  {
        String a = "hello2"; 
        final String b = "hello";
        String d = "hello";
        String c = b + 2; 
        String e = d + 2;
        System.out.println((a == c));
        System.out.println((a == e));
    }
}

true
false

http://bbs.csdn.net/topics/391070616

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跟你的问题一模一样