使用mvel检查List中是否存在元素 [英] Checking whether a element present in List using mvel

问题描述

我有一个清单.列表就像.

I had a list with me. The list is like.

List<String> locations=new ArrayList<String>();
locations.add("California");
location.add("sydney");
location.add("Egypt");

现在，我想检查一下此列表是否包含加利福尼亚和悉尼.我以为我可以用下面的那一个，但这给出了错误.

Now I want to check in mvel whether this list contains California and Sydney. I thought I could use the below one but that is giving error.

     location contains "sydney","california"

如何查找列表中是否包含mvel中的多个元素?

How can I find whether a list contains multiple elements in mvel?

推荐答案

这对我有用:

 //@Test
 public void testListContains() {
      List<String> locations = new ArrayList<String>();

     locations.add("California");
     locations.add("sydney");
     locations.add("Egypt");

     String expression = "thelocations contains acity && thelocations contains anothercity";

     Map container = new HashMap();

     container.put("thelocations", locations);

     container.put("acity", "sydney");

     container.put("anothercity","California");

     Object result = MVEL.eval(expression,container);

     System.out.println(result);
 }

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