tester.one :
I'm trying to understand new functions of java8: forEach and lambda expressions.
Trying to rewrite this function:
public <T extends Object> T copyValues(Class<T> type, T source, T result)
throws IllegalAccessException
{
for(Field field : getListOfFields(type)){
field.set(result, field.get(source));
}
return result;
}
using lambda.
I think it should be something like this but can't make it right:
() -> {
return getListOfFields(type).forEach((Field field) -> {
field.set(result, field.get(source));
});
};
Kirill Simonov :
You could use functions in the following way:
@FunctionalInterface
interface CopyFunction<T> {
T apply(T source, T result) throws Exception;
}
public static <T> CopyFunction<T> createCopyFunction(Class<T> type) {
return (source, result) -> {
for (Field field : getListOfFields(type)) {
field.set(result, field.get(source));
}
return result;
};
}
And then:
A a1 = new A(1, "one");
A a2 = new A(2, "two");
A result = createCopyFunction(A.class).apply(a1, a2);
The CopyFunction functional interface is pretty much the same as BinaryOperator except that BinaryOperator doesn't throw an exception. If you want to handle exceptions within a function, you can use the BinaryOperator instead.
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