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The Duration class is following the immutable pattern. In general I try to avoid object regeneration for resource reasons. I have learnt about the immutable concept and it is quite controversial IMHO. How come this special decision to introduce the immutable pattern especially for the Duration class?
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I am writing a program with IPOPT in Java and due to the nature of the problem, it is rather difficult to provide a Jacobian matrix.
The question is basically the title:
Is it possible to use IPOPT without Jacobian matrix and if so how?
i couldn't find anything in the documentation, but maybe i am just blind.
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The example here: https://github.com/mapstruct/mapstruct-examples/blob/3457f37c24ea7799b0752cc7ee8307283ab09ad2/mapstruct-mapping-with-cycles/src/main/java/org/mapstruct/example/mapper/EmployeeMapper.java
The generated mapping will be like:
Employee toEmployee(EmployeeDto employeeDto, CycleAvoidingMappingContext context) {...}
In practice, how to get a valid CycleAvoidingMappingContext object ?
You use the constructor.
new CycleAvoidingMappingContext()
When in doubt, look for unit tests.
https://github.com/mapstruct/mapstruct-examples/blob/master/mapstruct-mapping-with-cycles/src/test/java/org/mapstruct/example/EmployeeMapperTest.java#L59
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Is it a good practice to overload method in Java, calling this original method inside a new one but passing some default values as parameters for original method?
As the commenters noted, this is a standard practice. Typically, it is used to allow simplified signatures in order to provide default values. Like any other, pattern, some thought should be taken to avoid abusing it.
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I have some pre initialized objects of some class. These objects are heavy weight objects and each correspond to some configuration options specified by user. There will be exactly one instance corresponding to one configuration and same will be used every time.
My question is, which design pattern suits best to handle this kind of situation?
Most likely a Flyweight is what you are looking for. https://en.wikipedia.org/wiki/Flyweight_pattern
This can be used for pre-initialise heavy weight objects and reuse them.
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An object is an instance of a class What does that means I never understand this phrase properly.Give me some real world examples.I am bit confused.
Human is a class. You are an instance of Human.