java 8 foreach,返回Java 8 forEach

Boolean isSuccess = true;

if(aMap.size() != bMap.size())

{

return false;

}

aMap.entrySet().forEach(entry -> {

AKey aKey = entry.getKey();

BValue bValue = bMap.get(aKey);

if(bValue == null)

return;

AValue aValue = entry.getValue();

if(!aValue.getClosed().equals(bValue.getClosed()))

return;

if(!aValue.getClosedToArrival().equals(bValue.getClosedToArrival()))

return;

if(!aValue.getClosedToDeparture().equals(bValue.getClosedToDeparture()))

return;

if(!aValue.getLengthOfStayArrival().equals(bValue.getLengthOfStayArrival()))

return;

});

return isSuccess;

How can i return false when validation failure?

i tried to add return false, such as below:

if(!aValue.getLengthOfStayArrival().equals(bValue.getLengthOfStayArrival()))

return false;

but it is unexpected expression, who can help me have a look?

解决方案

You can't return false because you are in a lambda expression which implement the Consumer functional interface which method is of void type.

Instead, use anyMatch or noneMatch or allMatch :

return aMap.entrySet().stream().anyMatch(entry -> {

return false;// Put your condition here

});

I would also recommend to extract the validation in a method so that your pipeline looks like this :

return aMap.entrySet()

.stream()

.anyMatch(this::checkIfMatch);

Most of the times when opening {}, it's a good sign that you should create a new method.