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Java Java Basics Perfecting the Prototype Using Logical ORs and ANDs

Dima Nicholson
Dima Nicholson
809 Points
Posted by Dima Nicholson
Dima Nicholson
809 Points

Logical conjunction

I don't think one of your questions in quiz has correct answer. The question is: "Assuming that Sara has taken the Java and Python tracks, what is the value of isFamiliar below: boolean isFamiliar = (learnedJava || learnedPython || learnedRuby);". Your answer is True. But Sara has taken the Java && Python tracks, not Java || Python. isFamiliar will be true if it equals to (learnedJava && learnedPython || learnedJava || learnedPython || learnedRuby).

1 Answer

Philip Gales
Philip Gales
15,193 Points
Philip Gales
Philip Gales
15,193 Points 
// in this example there are 2 main operators, && and ||

// For the following code only 1 has to be true and it will return true. It does not matter if she has learned 1, 2 or all 3 of them
boolean isFamiliar = (learnedJava || learnedPython || learnedRuby); // <----------------true

//While using the && operator, all of the arguments have to be true and since she does not know Ruby, it is false

boolean isFamiliar = (learnedJava && learnedPython && learnedRuby); // <--------------false