Java 8: Default methods in interfaces

Interfaces can provide method bodies, so implementations inherit shared behavior.

Code

interface Greeter {
    String name();
    default String greet() { return "Hello, " + name() + "!"; }
}

Greeter g = () -> "Ava";
System.out.println(g.greet());

Output

Hello, Ava!

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Published 2026-07-26