Stream check not null on method using method reference [closed] - java

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Given the following code
List<Person> persons = ..;
List<Person> personsWithoutAddress =
persons.stream().filter(p -> p.getAddress() == null)
.collect(Collectors.toList());
is there a way to inline use the method reference Person::getAddress in the filter ( maybe combined with Objects::isNull or with some Guava utility method...) without writing an extra utility method/Predicate ?

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What is the C# equivalent of Java's getComponentType()? [closed]

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I am translating from Java to C# and have code similar to:
T[] #unchecked = (T[])Array.newInstance(array.getClass().getComponentType(), sampleSize);
I know getClass() equals to GetType() in C# and newInstance() equals to CreateInstance(); but idk what's the C# equivalent of getComponentType()?

Try this, it will work Array.CreateInstance(array.GetType().GetElementType(), sampleSize);

How to check a given json-path expression is syntactically correct? [closed]

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I need to validate whether the below json-paths are syntactically correct or not:
$[*].key1.key2[*].key3.key4 // valid
$[*].key1/key2[*].key3"key4 // invalid
Is there any API which can check the above json-path expressions and return true/false in Java ?

Try importing Jayway JsonPath https://github.com/json-path/JsonPath then JsonPath.read("{}", yourJsonPath); and if it doesn't explode the path is valid.

Use a JSON parser like JSON.parse:
function IsJsonString(str)
{
try
{
JSON.parse(str);
}
catch (e)
{
return false;
}
return true;
}

Unable to ignore selected elements while comparing two XML objects using XML Unit [closed]

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While comparing two XML objects considering the following constraints :
1)Ignore white spaces
2)Ignore the array order
3)ignoring some elements containing date
Please help me consider the 3rd constraint
The following is the code that I tried :
XMLUnit.setIgnoreWhitespace(true);
XMLUnit.setIgnoreAttributeOrder(true);
DetailedDiff diff = new DetailedDiff(XMLUnit.compareXML(expectedXML, actualXML));
List<?> allDifferences = diff.getAllDifferences();
if(allDifferences.size() == 0)
System.out.println("Test Passed");
else
System.out.println("Test failed due to following differences: ");
for(int differences = 0; differences < allDifferences.size(); differences++) {
System.out.println(allDifferences.get(differences));

how to call Java method which returns any List from R Language? [closed]

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How to call java method which returns list from R Language.

You can do it with rJava package.
install.packages('rJava')
library(rJava)
.jinit()
jObj=.jnew("JClass")
result=.jcall(jObj,"[D","method1")
Here, JClass is a Java class that should be in your ClassPath environment variable, method1 is a static method of JClass that returns double[], [D is a JNI notation for a double array. See that blog entry for details.

java expression to logical operation [closed]

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Is there a way in java we can convert an expression (xml or any other) to logical operations.
for example I have a property
prop01=Achivment:APPCom,done&&TODO:getforecast,!done;Achivement done
is there a way I convert it to java code like
Map userData = getUserData();
Map achivements = userData.get("achivements");
Map TODOs = userData.get("TODOs");
String achiv = achivements.get("APPCom");
String todo = TODOs.get("getforecast");
if(achiv == "done" && todo != "done")
system.out.println("Achivement done"); // part after ; in expression
any third party available for this kind of task?

I don't think this can be done with any third party library directly. You may need to use some library like Antlr to write a translator to translate from your expression to your Java code.

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