以下JSF片段:
<p:dataTable value="#{userbean.getAll()}" var="user">
引发此异常:
Encountered "(" at line 1, column 18. Was expecting one of: "}" ... "." ... "[" ... ">" ... "gt" ... "<" ... "lt" ... ">=" ... "ge" ... "<=" ... "le" ... "==" ... "eq" ... "!=" ... "ne" ... "&&" ... "and" ... "||" ... "or" ... "*" ... "+" ... "-" ... "/" ... "div" ... "%" ... "mod" ...
org.apache.el.parser.ParseException: Encountered "(" at line 1, column 18. Was expecting one of: …我正在尝试将Listavailable转换Currency为 a Map，要根据货币数字代码进行查找，我想获取字符串代码。这是代码。
但是上面的代码抛出以下错误，我对 Java 8 很陌生，因此我很头疼：
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.lang.IllegalStateException: Duplicate key YUM
at java.util.stream.Collectors.lambda$throwingMerger$0(Collectors.java:133)
at java.util.HashMap.merge(HashMap.java:1254)
at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)
at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1556)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
但是上面的这段代码抛出了错误，我对 Java 8 很陌生，因此我很头疼
public class IsoCurrencyCode {
private static final Set<Currency> ISO_CURRENCY = Currency.getAvailableCurrencies();
private static final Map<Integer, Currency> NUMERIC_MAP = ISO_CURRENCY.stream().collect(Collectors.toMap(Currency::getNumericCode, Function.identity()));
public static void main(String[] args) {
//
Currency currency = NUMERIC_MAP.get(971);
System.out.println(currency.getCurrencyCode());
} …