What is var?
var is a Java keyword that allows the compiler to automatically infer the type of a local variable from its initializer.
var is not a type itself.
Must be initialized at declaration
Only allowed for local variables inside methods, loops, etc.
Cannot infer null alone
Cannot be used for class fields, method parameters, or uninitialized variables
var is a keyword introduced in Java 10
Type Cast allowed in var?
When using var, numeric literals default to int; to infer long, short, or byte, you must provide an explicit suffix (L) or cast, because the compiler cannot guess which smaller type you intend.
Who Assigns Memory for var?
var is just a compiler feature
It does not create a new kind of variable.
The compiler infers the actual type of the variable from the initializer.
Memory allocation is still handled by the JVM based on the inferred type:
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