The Hidden Dynamic Life of Java
summary
Java increasingly emits invokedynamic into class files so decisions happen at runtime instead of compile time. Examples: string concatenation emits a bootstrap call that links a faster concat implementation for two object operands, pattern matching for switch builds a runtime chain that returns an int jump index, and lambdas use a bootstrap method to produce a method handle and act as a lambda factory that generates the functional instance on first use.
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chapters (10)
- 0:00Introduction
- 1:52JVM’s original design
- 3:20Dynamic languages on JVM
- 5:29How invokeDynamic works
- 9:48Java compiler and invokeDynamic
- 10:09String concatenation with invokeDynamic
- 12:20Pattern matching in switch
- 13:46Lambdas and invokeDynamic
- 15:59Runtime decisions benefits
- 17:25Further reading
