Difference between revisions of "Iterable Immutable List Assignment"
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==next() next() next()== | ==next() next() next()== | ||
− | [[File: | + | [[File:ImmutableList_iterator_next_next_next.svg|600px]] |
=Code To Implement= | =Code To Implement= |
Revision as of 03:57, 19 December 2020
Studio To Revisit
In this studio we will complete the DefaultImmutableList
implementation from the ImmutableList studio.
ImmutableList
The ImmutableList interface extends Iterable which has one method: iterator().
public interface ImmutableList<E> extends Iterable<E> { E head(); ImmutableList<E> tail(); boolean isEmpty(); }
Iterable
interface java.lang.Iterable<T>
Iterator
interface java.util.Iterator<T>
Examples
Using Iterable
Implementing Iterable
DoubleRange
ArrayIterable
Example
class: | IterableImmutableListExample.java | |
package: | immutable.list.example | |
source folder: | src/main/java |
The code:
ImmutableList<Integer> numbers = Lists.brackets(4, 66, 99); for (Integer i : numbers) { System.out.println(i); }
produces:
4 66 99
Diagrams
ImmutableList
ImmutableList<Char> letters = Lists.brackets('A', 'B', 'C');
iterator()
ImmutableList<Char> letters = Lists.brackets('A', 'B', 'C'); Iterator<Char> iter = letters.iterator()
next()
next() next()
next() next() next()
Code To Implement
enum EmptyImmutableList
class: | EmptyImmutableList.java | |
methods: | iterator | |
package: | immutable.list.assignment | |
source folder: | src/main/java |
iterator()
return an Iterator for the EmptyImmutableList.
Question to ask yourself: Does an iterator for an EmptyImmutableList ever have a next?
class NonEmptyImmutableList
class: | NonEmptyImmutableList.java | |
methods: | iterator | |
package: | immutable.list.assignment | |
source folder: | src/main/java |
iterator()
return an Iterator for this instance of NonEmptyImmutableList.
Note: If you are within an anonymous inner class, the way to get the outer class's this instance is to qualify it with the out class identifier. For example:
NonEmptyImmutableList.this
Test
class: | IterableAssignmentTestSuite.java | |
package: | immutable.list.assignment | |
source folder: | src/test/java |