The variable used in a switch statement can only be integers, convertable integers (byte, short, char), strings and enums. … The value for a case must be the same data type as the variable in the switch and it must be a constant or a literal.
Can you use characters in switch case?
You can use char ‘s for the switch expression and cases as well. In the code below, option matches case ‘b’ , hence its case block is executed.
How switch case is used in Java with example?
Example: Java switch Statement
The variable is compared with the value of each case statement. Since the value matches with 44, the code of case 44 is executed. size = “Large”; break; Here, the size variable is assigned with the value Large .
Can we use string in switch case?
Yes, we can use a switch statement with Strings in Java. … The expression in the switch cases must not be null else, a NullPointerException is thrown (Run-time). Comparison of Strings in switch statement is case sensitive.
How do you input a character in Java?
To read a char, we use next(). charAt(0). next() function returns the next token/word in the input as a string and charAt(0) function returns the first character in that string.
Which data type is not used in switch case in Java?
A switch works with the byte , short , char , and int primitive data types. … An if-then-else statement can test expressions based on ranges of values or conditions, whereas a switch statement tests expressions based only on a single integer, enumerated value, or String object.
Are switch statements faster than if else?
As it turns out, the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .
Is Default necessary in switch case?
No it is not necessary of default case in a switch statement and there is no rule of keeping default case at the end of all cases it can be placed at the starting andd middle of all other cases.
Can we use double in switch-case?
Usually switch-case structure is used when executing some operations based on a state variable. There an int has more than enough options. Boolean has only two so a normal if is usually good enough. Doubles and floats aren’t really that accurate to be used in this fashion.
Can we use Boolean in switch-case?
This is another reason, why switch-case is not for boolean type. There is no default case. According to the JLS section 14.11: for a switch ( Expression ) SwitchBlock : Expression can only be char, byte, short, int, Character, Byte, Short, Integer, String, or an enum type other wise a compile-time error occurs.
Can Case switch-case have null case?
The prohibition against using null as a switch label prevents one from writing code that can never be executed. If the switch expression is of a reference type, that is, String or a boxed primitive type or an enum type, then a run-time error will occur if the expression evaluates to null at run time.
What is switch in Java?
The switch statement or switch case in java is a multi-way branch statement. Based on the value of the expression given, different parts of code can be executed quickly. The given expression can be of a primitive data type such as int, char, short, byte, and char.
How do you accept a character in Java?
We use the next() and charAt() method in the following way to read a character.
- Scanner sc = new Scanner(System.in);
- char c = sc.next().charAt(0);
How do you make a character uppercase in Java?
The java. lang. Character. toUpperCase(char ch) converts the character argument to uppercase using case mapping information from the UnicodeData file.