字符串转 Boolean 的正确方式

        String s1 = "false";
        String s2 = "true";
        String s3 = "fAlSe";
        String s4 = "TrUe";
        String s5 = "true_a";

   正确的方法     Boolean.parseBoolean(string s);

        System.out.println(Boolean.parseBoolean(s1));
        System.out.println(Boolean.parseBoolean(s2));
        System.out.println(Boolean.parseBoolean(s3));
        System.out.println(Boolean.parseBoolean(s4));
        System.out.println(Boolean.parseBoolean(s5));

结果是：
false
true
false
true
false

     错误的方法     Boolean.getBoolean(string s);  

        System.out.println(Boolean.getBoolean(s1));
        System.out.println(Boolean.getBoolean(s2));
        System.out.println(Boolean.getBoolean(s3));
        System.out.println(Boolean.getBoolean(s4));
        System.out.println(Boolean.getBoolean(s5));

      以上5个的返回的值都为  false