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Comparator使用 Netbeans 和 Weblogic 12c 从 Java 1.7 升级到 Java 1.8 后,我们在界面上遇到 servlet 编译错误。这些.jsp文件在 Java 1.7 中运行良好。我已经阅读了其他类似的问题,但没有找到解决方案。我曾尝试检查 Weblogic Domain configuration JSP Compiler Backwards Compatible,但没有成功。编译器抱怨的方法是default方法,因此不需要提及,对吗?Comparator是否需要为 Java 8 重新编写实现的类?如果有,请指教。

错误

 viewFundCites.jsp:151:11: The type compareFundedPrOrderedByPr must implement the inherited abstract method Comparator.thenComparing(Function, Comparator)
    class compareFundedPrOrderedByPr implements Comparator {
          ^-----------------------^

代码

class compareFundedPrOrderedByPr implements Comparator {
    public int compare (Object a, Object b) {
        int ordering = 0;
        FundCite itemA = (FundCite)a;
        FundCite itemB = (FundCite)b;
        if ((null == itemA) && (null == itemB)) {
            ordering = 0;
        } else if ((null == itemA.getPrName()) && (null == itemB.getPrName())) {
            ordering = 0;
        } else if (null == itemA.getPrName()) {
            ordering = -1;
        } else if (null == itemB.getPrName()) {
            ordering = 1;
        } else {
            // Do primary sort by PR Name.
            ordering = itemA.getPrName().compareTo(itemB.getPrName());
            if (0 == ordering) {
                // Do secondary sort by CLIN.
                if ((null == itemA.getClin()) && (null == itemB.getClin())) {
                    ordering = 0;
                } else if (null == itemA.getClin()) {
                    ordering = -1;
                } else if (null == itemB.getClin()) {
                    ordering = 1;
                } else {
                    ordering = itemA.getClin().compareTo(itemB.getClin());
                }
            }
        }
        return ordering;
    }
}
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