// interfaces/MICollision.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

interface Bob1 {

default void bob() {

System.out.println("Bob1::bob");

}

}

interface Bob2 {

default void bob() {

System.out.println("Bob2::bob");

}

}

// class Bob implements Bob1, Bob2 {}

/* Produces:

error: class Bob inherits unrelated defaults

for bob() from types Bob1 and Bob2

class Bob implements Bob1, Bob2 {}

^

1 error

*/

interface Sam1 {

default void sam() {

System.out.println("Sam1::sam");

}

}

interface Sam2 {

default void sam(int i) {

System.out.println(i * 2);

}

}

// This works because the argument lists are distinct:

class Sam implements Sam1, Sam2 {}

interface Max1 {

default void max() {

System.out.println("Max1::max");

}

}

interface Max2 {

default int max() { return 47; }

}

// class Max implements Max1, Max2 {}

/* Produces:

error: types Max2 and Max1 are incompatible;

both define max(), but with unrelated return types

class Max implements Max1, Max2 {}

^

1 error

*/