JavaFinalInInterface.java

/**
 * <p>
 * What's the point (if there is any) and logic behind using/non-using "final" keyword for parameters in interface method and/or
 * its implementation?
 */
public class Test {
    // Example 1:

    public static interface I {
        void perform( final Boolean b ); // final on b
    }

    public static class C implements I {
        public void perform( Boolean b ) { // no final on b but no error
        }
    }

    // Example 2:

    public static interface I2 {
        void perform( Boolean b ); // no final on b
    }

    public static class C2 implements I2 {
        public void perform( final Boolean b ) { // final added, no error either
        }
    }
}