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Senior Developer Java Interview Questions

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What is the output of below program. var a = [1,2,3,4] for (var i=0; i<a.length; i++){ setTimeout(function(){ console.log(i) },1000) } ( My Ans : it will print 4 5 times as it will store the latest reference) Next They asked me : How can i print 1,2,3,4 by changing some code in above example
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Senior UI Developer

Interviewed at ValueLabs

4★
Feb 16, 2018

What is the output of below program. var a = [1,2,3,4] for (var i=0; i<a.length; i++){ setTimeout(function(){ console.log(i) },1000) } ( My Ans : it will print 4 5 times as it will store the latest reference) Next They asked me : How can i print 1,2,3,4 by changing some code in above example

1) I have class hierarchy and should create array of different instances of this hierarchy. They asked me to write a function which iterates this array and executes different methods according to the instance class. I suggested that downcasting is a bad idea and that it can violate Liskov substitution rule of the SOLID principles, and this problem should be solved using collections and generics, but they did not accept this answer 2) Create Queue N size using only N size array. 3) some Java concurrency related questions: synchronized volatile, atomic, etc....
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Senior Software Engineer

Interviewed at Taboola

4.2★
Dec 6, 2015

1) I have class hierarchy and should create array of different instances of this hierarchy. They asked me to write a function which iterates this array and executes different methods according to the instance class. I suggested that downcasting is a bad idea and that it can violate Liskov substitution rule of the SOLID principles, and this problem should be solved using collections and generics, but they did not accept this answer 2) Create Queue N size using only N size array. 3) some Java concurrency related questions: synchronized volatile, atomic, etc....

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