How Does The Switch Statement Work in Java Programming Language 2022?

How Does The Switch Statement Work?

The switch statement, often known as the switch case, is a branching statement that can take multiple possible paths through a Java program. Different sections of code are immediately run depending on the value of the expression.

Any primitive data type, including int, char, short, byte, and char, is acceptable for the provided expression. JDK7’s switch case supports enumerated data types, string classes, and wrapper classes (enum in java).

Switch Case In Java

With Java’s switch case, you can choose between many code blocks to run. Java’s control flow exits the switch block when it reaches the break keyword.

Upon encountering this keyword, code execution halts, and the case testing within the block is completed when a match is discovered. Because it stops processing the code when a break occurs, it can significantly reduce runtime.

The expression does not match any test case, and this keyword describes the code to run in that situation.

programmers coders

Using a Switch Case in Java

The switch statement, often known as the switch case, is a branching statement that can take multiple possible paths through a Java program. Different sections of code are immediately run depending on the value of the expression.

Any primitive data type, including int, char, short, byte, and char, is acceptable for the provided term. JDK7’s switch case supports enumerated data types, string classes, and wrapper classes (enum in java).

Java’s control flow exits the switch block when it reaches the break keyword. Upon encountering this keyword, code execution halts, and the case testing within the block is completed when a match is discovered. Because it stops processing the code when a break occurs, it can significantly reduce runtime.

The expression does not match any test case, and this keyword describes the code to run in that situation. Java’s switch case is similar to the if-else ladder in that it can test for many conditions simultaneously. Expression, either a constant or a literal expression, is passed to switch for evaluation.

Each test case is compared against the expression’s value until a match is discovered. In the event that no matching keyword is found, the default keyword and its associated code will be executed. If a test case doesn’t match, the code associated with it will be run.

Considerations While Working With Switch Case In Java:

  • Values in different instances cannot be equal.
  • It is essential that all test cases use values of the same data type as the switch variable.
  • A literal or constant value, rather than a variable, is required for the circumstances. Such as:
  1. Switch (1, 2, 3, 4, 5) and switch(1, 2, 3, 4) are both correct expressions.
  1. Switch(ef+gh) and Switch(e+f+g) are both incorrect.
  • When a switch is employed, the statement sequence can be broken off using a break statement.
  • It is not necessary for the values in the test cases to be sequential (ascending or descending). It’s possible to happen if necessary.
  • Not including the break statement will cause the code to continue running into the following test case.
  • The default statement can be placed anywhere within the switch block, but a break statement must follow it if it is not the last statement.
  • While nesting is legal, it does add complexity to the code.
java switch statement

Why Is A Switch Case Required?

However, as the number of possible branches in an if-else statement grows, so does the complexity of the resulting program. Using several if-else constructs in a program can make it harder to read and understand. Even the programmer who wrote the program can get thrown off by it. A switch statement can be used to solve this issue.

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The Switch Statement And Its Rules

  • There can never be an undefined result in the execution of an expression.
  • Labels for each case must always be static and distinct.
  • In the final position of the case label, use a colon ( : ).
  • In each scenario, you’ll need to use the break keyword.
  • There should be only one label set as the default.
  • Multiple switch statements can be nested inside of one another.

Switch Case In C Language

The switch statement in C is used to check the value of a variable against a number of possible outcomes. After a case is matched, the corresponding set of statements is carried out.

c language switch case statement

A switch’s identifier is the unique label given to each case within a given block. The user-supplied value is checked against each of the switch block’s cases until a matching case is found.

If no matching case is discovered, the switch block’s default statement is carried out, and control leaves the block.

Switch Case In C++ Language

The statements associated with a switch case statement are executed based on the result of evaluating a specified expression, which must satisfy a condition. Its primary function is to trigger events with varying degrees of severity depending on the status of certain variables (cases).

  • Switch case statements allow a value to alter the process by which control of execution is determined.
  • They can be used instead of long if statements that compare a variable to many different possible integer values.
  • To branch in multiple directions, use the switch statement. It’s a convenient tool for directing code execution to different locations depending on the value of an expression.

The switch statement in C++ is used to select a single action from several possible outcomes. It’s very much like a series of “if” and “else if” statements.

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The cases of a switch statement are based on conditions, and the default case is always the same.

The “case value” in a switch statement may be either a char or an int.

c++ switch statement

Some guidelines for using the switch statement are as follows.

  • One of the N cases is possible.
  • Second, each value in the case must be different from every other value.
  • A break statement may be included in any statement of the case. One need not do so.

Conclusion

A switch statement, in the context of programming languages, is a selection control mechanism that allows the control flow of execution to be modified via search and map depending on the value of a variable or expression.

In most high-level imperative programming languages, including Pascal, Ada, C/C++, C#, Visual Basic.NET, Java, and many more, switch statements can be written using keywords like a switch, case, select, or inspect and perform some of the same functions as the if statement.

There are two primary kinds of switch statements: the Pascal-style structured switch, which has only one possible branch, and the C-style unstructured switch, which acts like a goto.

For the most part, switches are used to simplify the code by eliminating unnecessary repetition and, if the heuristics allow it, to speed up the program’s execution by making compiler optimizations simpler.

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Maria D Ramsey

Hey Maria D Ramsey here, I am a journalist and author with a love for writing guides that help people improve their lives. I was born and raised in the United States, and my hobbies include cooking and reading novels.

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