Switch expressions can also be used as a replacement for lambda expressions. We can also use additional conditions with the & operator to further refine the matching criteria. If there is a match, the associated block of code is executed. However, and this is the key, you are using the switch expression form, and compiler-provable exhaustiveness is. The value of the expression in switch statement is compared with the values of each case. The switch statement form has had the property that many linting tools and IDEs will generate a warning if you arent covering all the cases. In this example, we use the case keyword to match on the type and value of the obj variable. The switch statement form, on the other hand, is 25+ years old. Here are some more complex use cases: Pattern matching Object obj = new String("Hello") Ĭase String s & s.length() > 3 -> "A string with length greater than 3: " + s Ĭase SomeClass c & c.someMethod() -> "An instance of SomeClass that returns true from someMethod(): " + c Ĭase SomeClass c -> "An instance of SomeClass: " + c Switch expressions in Java can be used for more than just simple integer or string comparisons. ![]() Examples of more complex use cases for switch expressions Examples of switch Statement in Java Regular Java switch statement class Test. Overall, switch expressions are a powerful addition to the Java language that address many of the limitations of the traditional switch statement and provide a more flexible and concise syntax for conditional branching. This makes switch expressions easier to read and less error-prone. Instead, each case can be treated as an expression that returns a value. Switch expressions also allow for a more concise syntax that eliminates the need for break statements. In addition, switch expressions allow for the use of the yield keyword, which allows a value to be returned from the expression. With switch expressions, it is now possible to use the switch statement with other types, such as strings and enums, without the need to convert them to a compatible type first. Switch expressions were introduced in Java 12 as a preview feature to address these limitations of the traditional switch statement. Additionally, it is not possible to return a value from a traditional switch statement. This can be tedious to write and can lead to errors if a break statement is accidentally omitted. This means that it cannot be used with other types, such as strings or enums, without converting them to a compatible type first.Īnother limitation of the traditional switch statement is that it requires each case to end with a break statement in order to avoid fall-through. One of the main limitations is that it can only be used with primitive types ( byte, short, int, long) and their corresponding wrapper classes ( Byte, Short, Integer, Long), as well as the char type. Many existing switch statements are essentially simulations of switch expressions, where each arm either assigns to a common target variable or returns a. The traditional switch statement in Java has a number of limitations that can make it difficult to use in certain situations. ![]() Frequently asked questions Switch Statement VS Switch Expressions. ![]()
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