HOTSPOT -
You are interviewing for a job as a Java developer. You need to demonstrate your understanding of switch statements.
For each of the following code segments, select Yes if the code segment can be changed to a switch statement with up to three case statements. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Hot Area:
References:
https://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html
No, Yes, No. You can only test for equality in switch cases and the instructions said "up to 3" cases. The middle example is doable with cases for A and B and a default case. You would have to make a case for every possible year over 25 for the first example and all the possible fractional GPAs between 4.0 and 3.0 for the last example.
Correct
No, Yes, No
Yes, Yes, Yes. Here is the example: public double discountByAge(int age) { double discount = -1.00; switch((age >= 25) ? 0 : (age >= 21 && age < 25) ? 1 : 2) { case 0: discount = 0.50; break; case 1: discount = 0.25; break; case 2: default: discount=0.0; break; } return discount; }
switch doesn't work with double and string as well(except wrappers) in middle example switch holds string and in 3rd example switch holds double
int age; switch(age){ case(age >= 25): d = .5; break; case(age >= 21): d=.25; break; default: d=0 } YES char grade; switch(grade){ case(grade == A): message = "exceeds"; break; case(grade == B): message = "standard"; break; default: message = "improve"; YES -Does not work with doubles NO
First one is wrong give us compiletime error
Try it! double gpa = 3.2; int priority = 0; switch (gpa==4.0?1:gpa>=3.5?2:gpa>=2.5?3:0) { case 1: priority = 1; break; case 2: priority = 2; break; case 3: priority = 3; break; } System.out.println(priority);