JEP Draft: Enhanced Local Variable Declarations(openjdk.org)
openjdk.org
JEP Draft: Enhanced Local Variable Declarations
https://openjdk.org/jeps/8357464
2 comments
TLDR
* Destructuring via Record Patterns
The most prominent feature is the ability to use a record pattern on the left-hand side of a local variable declaration. This allows you to "destructure" an object and initialize multiple variables in a single statement.
Traditional way:
You can now use these same record patterns in the header of an enhanced for loop to extract data from every element in a collection or array.
* Destructuring via Record Patterns
The most prominent feature is the ability to use a record pattern on the left-hand side of a local variable declaration. This allows you to "destructure" an object and initialize multiple variables in a single statement.
Traditional way:
Point p = getPoint();
int x = p.x();
int y = p.y();
Point(int x, int y) = getPoint();
Circle(Point(int x, int y), double radius) = getCircle();
You can now use these same record patterns in the header of an enhanced for loop to extract data from every element in a collection or array.
for (Circle(Point(int x, int y), double radius) : circles) {
// Directly use x, y, and radius here
}
That looks weird. An if whose condition always is right looks superfluous. It also makes it look as if one could write things such as
Finally, that code is wordy. I know that is the Java way, but couldn’t it be slightly shorter by not requiring specifying basic types as in
? (I wouldn’t go as far as
. That doesnt feel Java to me)