Technology Questions

Error-first callbacks are used to pass errors and data as well. You have to pass the error as the first parameter, and it has to be checked to see if something went wrong. Additional arguments are used to pass data.

fs.readFile(filePath, function(err, data) {
if (err) {
// handle the error, the return is important here
// so execution stops here
return console.log(err)
}
// use the data object
console.log(data)
})

HashCode method return int value. So the Hash value is the int value returned by the hash function .

If you want to do equality check or want to use your object as key in HashMap, we must override hashcode and equals() method.

Generally,test plan document is prepared by TL&QM.

Entry &Exit criteria is part of test plan document

Entry criteria is 

- Testing environment established

- Test cases prepared

- Build received from development team

Exit criteria is

- All modules are covered or not

- All test cases are completely executed or not

- All bugs resolved or not

1) List down usecases (taken from business cases) from function specs. For each use case write a test case and categorize them into sanity tests, functionality, GUI, performance etc. Then for each test case, write its workflow. 

2) For a GUI application - make a list of all GUI controls. For each control start writing test cases for testing of the control UI, functionality (impact on the whole application), negative testing (for incorrect inputs), performance etc. 

By use of %ISOPEN status variable.

Immutable classes are Java classes whose objects can not be modified once created. Any modification in Immutable object result in new object. For example is String is immutable in Java. Mostly Immutable are also final in Java, in order to prevent sub class from overriding methods in Java which can compromise Immutability. You can achieve same functionality by making member as non final but private and not modifying them except in constructor.