Questions

What object types can be used in the switch clause?

What object types can be used in the switch clause?

A switch works with the byte , short , char , and int primitive data types. It also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character , Byte , Short , and Integer (discussed in Numbers and Strings).

Which one of the following operators determines if a given object is of the type of a specific class?

The java “instanceof” operator is used to test whether the object is an instance of the specified type (class or subclass or interface). It is also known as type comparison operator because it compares the instance with type.

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Which datatype is not allowed in the switch statement?

1) The expression used in switch must be integral type ( int, char and enum). Any other type of expression is not allowed. 2) All the statements following a matching case execute until a break statement is reached.

Can you do a switch statement with Strings Java?

Yes, we can use a switch statement with Strings in Java. It is recommended to use String values in a switch statement if the data you are dealing with is also Strings. The expression in the switch cases must not be null else, a NullPointerException is thrown (Run-time).

Which statement is true about the switch statement?

The statements in a switch continue to execute as long as the condition at the top of the switch remains true.

Does Instanceof check for NULL?

Nope, a null check is not required before using instanceof. means, The expression x instanceof SomeClass will be false if x is null. Hence, if the operand is null, the instanceof will return false.

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Which data type Cannot be used in switch-case in Java?

There must be a good reason why the long primitive data type is not allowed.

Which among the following datatypes are used in switch-case statements?

the datatypes which are allowed in switch case are int,char byte,short. The data type of case labels of switch statement are integer and character in c .

Does switch support string data type?

You cannot use string in either switch or case .

Can you put an if statement inside a switch statement Java?

Nested if statements means an if statement inside an if statement. Yes, java allows us to nest if statements within if statements. i.e, we can place an if statement inside another if statement.

What is switch statement in Java with example?

Switch Statement in Java. The switch statement is a multi-way branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. Basically, the expression can be byte, short, char, and int primitive data types.

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How do you use a string in a switch statement?

Using Strings in switch Statements. In Java SE 7 and later, you can use a String object in the switch statement’s expression. The following code example, StringSwitchDemo, displays the number of the month based on the value of the String named month: public class StringSwitchDemo { public static int getMonthNumber (String month)

What is the correct syntax for switch case in Java?

The syntax of the switch statement in Java is: switch (expression) { case value1: // code break; case value2: // code break;…… default: // default statements } How does the switch-case statement work? The expression is evaluated once and compared with the values of each case.

What is a switch block in JavaScript?

The body of a switch statement is known as a switch block. A statement in the switch block can be labeled with one or more case or default labels. The switch statement evaluates its expression, then executes all statements that follow the matching case label. You could also display the name of the month with if-then-else statements: