From 4e34038469898846100c7c9224bd49eee6159b62 Mon Sep 17 00:00:00 2001
From: Arghya Ghosh <71373838+uiuxarghya@users.noreply.github.com>
Date: Wed, 5 Jan 2022 05:07:11 +0530
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+---
+title: Java switch Statement
+description: In this tutorial, you will learn to use the switch statement in Java to control the flow of your program’s execution with the help of examples.
+---
+
+import { TipInfo } from '@/components/Tip'
+import NextImage from 'next/image'
+
+The `switch` statement allows us to execute a block of code among many alternatives.
+
+The syntax of the `switch` statement in Java is:
+
+```java
+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.
+
+- If `expression` matches with `value1`, the code of `case value1` are executed. Similarly, the code of `case value2` is executed if `expression` matches with `value2`.
+- If there is no match, the code of the **default case** is executed.
+
+
+
+**Note:** The working of the switch-case statement is similar to the [Java if...else...if ladder](/docs/if-else-statement#3-java-if-else-if-statement). However, the syntax of the `switch` statement is cleaner and much easier to read and write.
+
+
+
+### Example: Java switch Statement
+
+#### Input
+
+```java
+// Java Program to check the size
+// using the switch...case statement
+
+class Main {
+ public static void main(String[] args) {
+
+ int number = 44;
+ String size;
+
+ // switch statement to check size
+ switch (number) {
+
+ case 29:
+ size = "Small";
+ break;
+
+ case 42:
+ size = "Medium";
+ break;
+
+ // match the value of week
+ case 44:
+ size = "Large";
+ break;
+
+ case 48:
+ size = "Extra Large";
+ break;
+
+ default:
+ size = "Unknown";
+ break;
+
+ }
+ System.out.println("Size: " + size);
+ }
+}
+```
+#### Output:
+
+```text
+Size: Large
+```
+In the above example, we have used the switch statement to find the size. Here, we have a variable `number`. The variable is compared with the value of each case statement.
+
+Since the value matches with **44**, the code of `case 44` is executed.
+
+```java
+size = "Large";
+break;
+```
+Here, the `size` variable is assigned with the value `Large`.
+
+
+## Flowchart of switch Statement
+
+
+
+
+
+
Flow chart of the Java switch statement
+
+
+
+## break statement in Java switch...case
+
+Notice that we have been using break in each case block.
+
+```java
+ ...
+case 29:
+ size = "Small";
+ break;
+...
+```
+The `break` statement is used to terminate the **switch-case** statement. If `break` is not used, all the cases after the matching case are also executed. For example,
+
+#### Input
+
+```java
+class Main {
+ public static void main(String[] args) {
+
+ int expression = 2;
+
+ // switch statement to check size
+ switch (expression) {
+ case 1:
+ System.out.println("Case 1");
+
+ // matching case
+ case 2:
+ System.out.println("Case 2");
+
+ case 3:
+ System.out.println("Case 3");
+
+ default:
+ System.out.println("Default case");
+ }
+ }
+}
+```
+
+#### Output
+
+```text
+Case 2
+Case 3
+Default case
+```
+In the above example, `expression` matches with `case 2`. Here, we haven't used the break statement after each case.
+
+Hence, all the cases after `case 2` are also executed.
+
+This is why the `break` statement is needed to terminate the **switch-case** statement after the matching case. To learn more, visit Java break Statement.
+
+## default case in Java switch-case
+
+The switch statement also includes an **optional default case**. It is executed when the expression doesn't match any of the cases. For example,
+
+#### Input
+
+```java
+class Main {
+ public static void main(String[] args) {
+
+ int expression = 9;
+
+ switch(expression) {
+
+ case 2:
+ System.out.println("Small Size");
+ break;
+
+ case 3:
+ System.out.println("Large Size");
+ break;
+
+ // default case
+ default:
+ System.out.println("Unknown Size");
+ }
+ }
+}
+```
+#### Output
+
+```text
+Unknown Size
+```
+
+In the above example, we have created a **switch-case** statement. Here, the value of `expression` doesn't match with any of the cases.
+
+Hence, the code inside the **default case** is executed.
+
+```java
+default:
+ System.out.println("Unknown Size);
+```
+
+
+
+
+**Note:** The Java switch statement only works with:
+
+
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