![]() JDK 16 had a records feature, for developers who needed to deal with boilerplate codes (such as getter/setter, constructor, equals, and hashcode implementations). Records provide a compact syntax for declaring classes that are transparent holders for shallowly immutable data. With the new feature “pattern matching for switch”, a chain of if-else conditions is replaced with switch expressions as it checks for the pattern.Ĭase Integer i -> String.format("int %d", i) Ĭase Long l -> String.format("long %d", l) If we want to use patterns to check for certain conditions, then the chain of if-else condition blocks is used as shown below. allow patterns to appear in case labelsĬurrent switch statements allow working on a few types - Numeric, Enum, and Strings.Pattern matching on switch allows an expression to be tested against a number of patterns, each with specific action. Public abstract sealed class Shape permits Circle,Square, Rectangle Pattern Matching for switch Preview - JDK 17 JEP 406 subclasses extending sealed class can be either final or another sealed class or non-sealed classes, like in the below example. If the module is not defined, it needs to be the same package. support future enhancements in pattern matching to avoid exhaustive analysis of patternsĪ class is sealed by adding a sealed modifier to its declaration and the permits clause specifies classes that are permitted to extend a sealed class, sealed class and permitted subclass needs to be in the same module. ![]()
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