default-method Questions
5
Solved
Default methods are a nice new tool in our Java toolbox. However, I tried to write an interface that defines a default version of the toString method. Java tells me that this is forbidden, since me...
Arlin asked 3/6, 2014 at 13:50
4
I have below scenario :
class C {
static void m1() {}
}
interface I {
default void m1() {}
}
//this will give compilation error : inherited method from C cannot hide public abstract method in ...
Bloodandthunder asked 9/8, 2017 at 5:16
2
I am trying to setup my own JSF tag libary. So I created a composite component with an backing interfaces as a blueprint to build a backing bean for this component.
public interface CompLogin {
...
Qualify asked 13/5, 2016 at 9:0
3
Solved
Lets say I have the following structure:
abstract class A {
abstract boolean foo();
}
interface B {
default boolean foo() { return doBlah(); }
}
class C extends A implements B {
//function fo...
Spasmodic asked 12/5, 2017 at 17:39
5
Solved
Java 9 is near to come and more features will be added to Java interfaces, like private methods. default methods in interfaces were added in Java 8, essentially to support the use of lambdas inside...
Lederman asked 27/4, 2017 at 15:1
5
Solved
I want to refactor template method using java 8 new default method.
Say I have a flow of process define in abstract class:
public abstract class FlowManager{
public void startFlow(){
phase1();
...
Ligialignaloes asked 29/6, 2015 at 20:48
3
Solved
given the interfaces (which are very large and generated out of language definitions):
interface VisitorA {
default void visit(ASTA1 node) {...}
...
default void visit(ASTA2000 node) {...}
}
i...
Asben asked 23/8, 2016 at 22:8
2
Solved
Recently I came across this code.
public interface CustomerQueryService {
default Customer getCustomerById(long id) {
throw new NotImplementedException();
}
}
Later, it turned out that it's ...
Ultramontanism asked 21/2, 2017 at 13:15
4
Solved
Java 8 introduces the concept of default methods. Consider the following interface with a default method :
public interface IDefaultMethod {
public abstract void musImplementThisMethod();
publi...
Criminality asked 25/1, 2015 at 14:24
3
Problem:
We know that Java doesn’t allow to extend multiple classes because it would result in the Diamond Problem where the compiler could’t decide which superclass method to use. With interface ...
Conjuncture asked 21/12, 2016 at 7:14
4
Solved
Does Java have plan that default method substitute for Abstract Class?
I could not find a real case to use default method instead of Abstract?
Staid asked 7/10, 2016 at 9:15
3
In Java 8, we can have default implementations for methods in interfaces, in addition to declarations which need to be implemented in the concrete classes.
Is it a good design or best practice to ...
Confession asked 5/9, 2016 at 12:10
1
Solved
While developing a maven plugin the build prints error:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-plugin-plugin:3.3:descriptor (default-descriptor) on project default-method-de...
Wrest asked 23/7, 2016 at 23:15
3
Solved
I have to design an interface for hierarchical entity:
interface HierarchicalEntity<T extends HierarchicalEntity<T>> {
T getParent();
Stream<T> getAncestors();
}
It's quite e...
Bluing asked 6/5, 2016 at 18:7
1
Solved
When creating a default method in Java 8, certain Object methods are not callable from within the default method. For example:
interface I {
default void m() {
this.toString(); // works.
this.c...
Bosh asked 27/4, 2016 at 15:38
1
Solved
Let's say I have the following class hierarchy:
interface Collection<E>
{
Collection<E> $plus(E element)
}
interface MutableCollection<E> extends Collection<E>
{
@Overri...
Begird asked 31/1, 2016 at 14:39
2
Solved
Cloneable in Java is inherently broken. Specifically, my biggest problem with the interface is it expects a method behavior that doesn't define the method itself. So if traversing through a Cloneab...
Kadner asked 6/12, 2015 at 20:1
1
Solved
In Java 8, if I have two interfaces with different (but compatible) return types, reflection tells me that one of the two methods is a default method, even though I haven't actually declared the me...
Necessaries asked 23/11, 2015 at 21:18
2
Solved
In this example on java website's tutorial page. Two interfaces define the same default method startEngine(). A class FlyingCar implements both interfaces and must override startEngine() because of...
Candida asked 18/10, 2015 at 6:55
5
Solved
I was reading this tutorial on Java 8 where the writer showed the code:
interface Formula {
double calculate(int a);
default double sqrt(int a) {
return Math.sqrt(a);
}
}
And then said
D...
Salena asked 13/10, 2015 at 17:6
2
As we all know, multiple interfaces can implemented in Java. Does the order of their implementation matter? I mean, is implementing B, C is same as C, B in Java 8? My tests show order does matter -...
Chappie asked 19/9, 2015 at 2:38
1
Solved
I have a interface and abstract class.
public class TEST extends Abstract implements Inter2{
void print() {
toDO();
}
public static void main(String[] args) {
new TEST().toDO();
}
}
...
Polyzoarium asked 11/9, 2015 at 6:5
2
Solved
Consider the following case,
interface IFace1 {
default void printHello() {
System.out.println("IFace1");
}
}
interface IFace2 {
void printHello();
}
public class Test implements IFace1, IF...
Ballarat asked 10/9, 2015 at 17:51
3
Solved
Consider the below example,
public class Testing extends SupCls implements Intf {
public static void main(String[] args) {
new Testing().test();
}
}
class SupCls {
public void test() {
Syste...
Aplomb asked 9/9, 2015 at 4:59
5
Solved
It is usually admitted that extending implementations of an interface through inheritance is not best practice, and that composition (eg. implementing the interface again from scratch) is more main...
Veil asked 6/7, 2015 at 9:20
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