Example 2: Matching on Enum Constants

Example 1: Matching on Strings

Pattern matching in switch statements can also be combined with other Java features, such as enums and records. For example, developers can match on enum constants and record components using pattern matching.

Lambda Syntax

Java

import java.io.*; 
  
class GFG { 
    public static void main(String[] args) 
    { 
        enum Color { RED, GREEN, BLUE } 
  
        Color color = Color.RED; 
  
        // Match on the enum constant "color" 
        switch (color) { 
          // Match on the enum constant "RED" 
          case RED -> System.out.println("The color is red.");  
          // Match on the enum constant "GREEN" 
          case GREEN -> System.out.println("The color is green.");  
          // Match on the enum constant "BLUE" 
          case BLUE -> System.out.println("The color is blue.");  
        } 
    } 
}

Output

The color is red.

An enum (short for “enumeration”) in programming is a data type that represents a fixed set of values, often referred to as “enumerators” or “constants”. In the example code you provided, the Color enum defines a set of three possible values: RED, GREEN, and BLUE.

Using an enum in a switch statement allows you to handle each of the possible values of the enum differently, without the need for multiple if-else statements. In this case, the switch statement checks the value of the color variable and executes the corresponding case statement based on its value.

This code defines an enum called Color with three possible values: RED, GREEN, and BLUE. After defining the Color enum, the code sets a variable color to Color.RED. Then, a switch statement is used to check the value of the color variable. The switch statement uses the case keyword to specify what code should be executed for each possible value of the Color enum.

Conclusion

Developers should be aware of the limitations of pattern matching in switch statements, such as the fact that it only works on certain types of patterns and may not work as well as other methods. In addition, developers should be aware of the potential of unintended behavior or bugs when using the pattern matching in switch statements, especially when dealing with complex systems

Overall, pattern matching in switch statements is a powerful and useful tool that can improve code quality and readability. However, like any other part of programming, developers should weigh its advantages and disadvantages and use it properly in their programs.

Pattern Matching for Switch in Java

Pattern matching for a switch in Java is a powerful feature that was introduced in Java 14. Before this update, a switch expression could only be used to match the type of a value, rather than its actual value. However, by comparing the model, developers can now match the values of Strings, enums, and records, which makes it much easier to write short and readable code. In traditional switch syntax, operators could only match the type of the variable, whereas, in lambda syntax, operators had to use if-else statements to match a value. Pattern matching for a switch provides an easy and efficient way to match values, making code more accurate and precise.

The syntax for pattern matching in Java is fairly straightforward and involves a ‘case’ keyword followed by an arrow (‘->’) to indicate what code should be executed if the pattern matches. In addition to matching on specific values, developers can also use pattern matching to perform more complex tasks, such as matching on specific records fields or matching on a range of values. Pattern matching for switch in Java is another exciting feature that will allow developers to write transparent and concise code, while also reducing the risk of errors. By matching real values, rather than just their types, developers can write more accurate and precise code, ultimately resulting in better software.

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