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New Java 7 Feature: String in Switch support

· Java Zone

What every Java engineer should know about microservices: Reactive Microservices Architecture. Brought to you in partnership with Lightbend.

One of the new features added in Java 7 is the capability to switch on a String.

With Java 6, or less

    String color = "red";  

if (color.equals("red")) {
System.out.println("Color is Red");
} else if (color.equals("green")) {
System.out.println("Color is Green");
} else {
System.out.println("Color not found");
}

With Java 7:

String color = "red";  

switch (color) {
case "red":
System.out.println("Color is Red");
break;
case "green":
System.out.println("Color is Green");
break;
default:
System.out.println("Color not found");
}
Conclusion

The switch statement when used with a String uses the equals() method to compare the given expression to each value in the case statement and is therefore case-sensitive and will throw a NullPointerException if the expression is null. It is a small but useful feature which not only helps us write more readable code but the compiler will likely generate more efficient bytecode as compared to the if-then-else statement.

 

From http://www.vineetmanohar.com/2011/03/new-java-7-feature-string-in-switch-support/

Microservices for Java, explained. Revitalize your legacy systems (and your career) with Reactive Microservices Architecture, a free O’Reilly book. Brought to you in partnership with Lightbend.

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