True or False

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Submitted by c-admin on Tue, 05/28/2019 - 05:42

QID:

148

Type:

True or False

Category:

Java Programmer I

Tags:

decision constructs

Question:

The following method will compile and run without any problems.

public void switchTest(byte x){
switch(x){
case 'b': // 1
default : // 2
case -2: // 3
case 80: // 4
}
}

Select 1 option

A. True
B. False

Answer and Explanation (Click to expand)

Answer:

Explanation:

The following types can be used as a switch variable: byte, char, short, int, String, and enums. Note that long, float, double, and boolean are not allowed.

All the case constants should be assignable to the switch variable type. i.e. had there been a case label of 128 ( case 128 : //some code), it would not have compiled. Because the range of a byte is from -128 to 127 and so 128 is not assignable to 'x'.

The interval value of 'b' is 98, which is less than 127 so Line //1 is fine.

Note: Although it is not required for the exam to know the integral values of characters, it is good to know that all English letters (upper case as well as lower case) as well as 0-9 are below 127 and so are assignable to byte.

Q&A Set:

Set 14

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abstract classes
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decision constructs
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file upload
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session
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