how to use or (||) oparetor in java switch?

Question

https://code.sololearn.com/cA3A189a18A7/?ref=app

plz fix this error

Answer 1

You cant use || binary operator with strings in switch case there..
Alternatively you can use
case "A" :
case "a" :
{ same logic for both without using break;} it works

Answer 2

Hello Jawad Shopnil

There is no deeper reason, it is just how the switch statement is designed.
For some reason you also can't uses ranges like this: case 1...10:
Would be nice but Java didn't implemented it.

If you want to use || or && then you need to use if statements.

Or as Jayakrishna🇮🇳 mentioned you can use of the so callled "fall through". Here is a small example:

public class Program
{
public static void main(String[] args) {

String test = "A";

switch(test){

case "A":
case "a": System.out.println("works");
break;
}

}
}

Executes case A and because there is no break case a will also execute.

Answer 3

you can also do
String type = scanInput.nextLine().toUpperCase();

or from Java 14 there is option to use syntax

switch (type) {
case "A", "a" -> {
//...
}
case "B", "b" -> {
//...
}
default ->
//...
}

Answer 4

@Jawad Shopnil that @zemiak has a simple solution ..That's awesome new feature i think. Its new to me.. tqs to zemiak..

Answer 5

can you explain why is not working?

Answer 6

cases should result into a numarical value.. so switch case only works with int, char. in java it also allows strings..
Binary operator not works with strings. . So "A" || "a" invalid in java..

Answer 7

in Java specification
15.24. Conditional-Or Operator ||

Each operand of the conditional-or operator must be of type boolean or Boolean, or a compile-time error occurs.

https://docs.oracle.com/javase/specs/jls/se16/html/jls-15.html#jls-15.24

Answer 8

Write a program that asks the user to input a sentence and then counts the number of words in the sentence؟؟
please help😥