Endienness conversion between Little and Big [closed] - java

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does java have a function to make a direct conversion between Little and BigEndien?

Several. Byte order can be swapped using ByteBuffer or Integer/Long.reverseBytes

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how to read a value which is in a json array in java [closed]

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{"setAsLanding":false,"ref":"test123","column":"medium","row":"large","title":"test123","appInNav":false}
how to read the value of setAsLanding.

How to use the mapping in practice? [closed]

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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

Keyset to Set of string [closed]

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I have a Map<Type, Data>
We need to convert the keySet of the map to a LinkedHashSet of String.
What is the most efficient way to do it using java 8 stream.
map.keySet().stream().map(Object::toString).collect(toCollection(LinkedHashSet::new));

Regular expression to check number greater than 100 [closed]

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I want to construct a Regular Expression in Java that allows a number that is greater than 100. Can anyone help with that?
^(?!(?:\d{1,2}|100)$)[0-9]\d+$
Try this.See demo.
https://regex101.com/r/sJ9gM7/549

an object is an instance of a class. what does that mean.? [closed]

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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.

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