Default Methods

Interface methods with implementation (Java 8+)

4 min read

Default Methods

Default methods allow interfaces to have method implementations.

Code Examples

Default method in interface

java
1
2interface Logger {
3    default void log(String msg) {
4        System.out.println(msg);
5    }
6}
7
8class AppLogger implements Logger {}
9

Use Cases

  • Backward compatibility
  • Optional behavior

Common Mistakes to Avoid

  • Ignoring default method conflicts
  • Overusing default methods