Class SwitchExpressionPreviewExamples

java.lang.Object
net.jrodolfo.java_evolution.java12.SwitchExpressionPreviewExamples
public class SwitchExpressionPreviewExamples extends Object
Demonstrates switch expressions as a Java 12 preview feature.

Before switch expressions, returning a value from switch usually required a mutable local variable and careful break statements. Accidental fall-through was also a common source of bugs.

Java 12 previewed switch expressions to solve those problems. They let switch produce a value directly and introduced arrow labels for safer branch syntax. Switch expressions became final later, in Java 14. This project compiles on JDK 25, so the example uses the final syntax while documenting that Java 12 was the first preview release.

  • Constructor Details

    • SwitchExpressionPreviewExamples

      public SwitchExpressionPreviewExamples()

  • Method Details

    • dayType

      public String dayType(int dayNumber)
      Uses a switch expression to return a value directly.
      Parameters:
      dayNumber - day number from 1 to 7
      Returns:
      whether the day is a weekday or weekend