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147 lines (124 loc) · 4.85 KB
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/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle or the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
public class DataStructure {
private final static int SIZE = 15;
private int[] arrayOfInts = new int[SIZE];
public DataStructure() {
for (int i = 0; i < SIZE; i++) {
arrayOfInts[i] = i;
}
}
public int size() {
return SIZE;
}
public int get(int index) {
return arrayOfInts[index];
}
interface DataStructureIterator extends java.util.Iterator<Integer> { }
private class EvenIterator implements DataStructureIterator {
private int nextIndex = 0;
public boolean hasNext() {
return (nextIndex <= SIZE - 1);
}
public Integer next() {
Integer retValue = Integer.valueOf(arrayOfInts[nextIndex]);
nextIndex += 2;
return retValue;
}
}
public DataStructureIterator getEvenIterator() {
return new EvenIterator();
}
public void printEven() {
DataStructureIterator iterator = getEvenIterator();
while (iterator.hasNext()) {
System.out.print(iterator.next() + " ");
}
System.out.println();
}
public void print(DataStructureIterator iterator) {
while (iterator.hasNext()) {
System.out.print(iterator.next() + " ");
}
System.out.println();
}
public void print(java.util.function.Function<Integer, Boolean> function) {
for (int i = 0; i < SIZE; i++) {
if (function.apply(i)) {
System.out.print(arrayOfInts[i] + " ");
}
}
System.out.println();
}
public static Boolean isEvenIndex(Integer index) {
if (index % 2 == 0) return Boolean.TRUE;
return Boolean.FALSE;
}
public static Boolean isOddIndex(Integer index) {
if (index % 2 == 0) return Boolean.FALSE;
return Boolean.TRUE;
}
public static void main(String s[]) {
DataStructure ds = new DataStructure();
System.out.println("printEven()");
ds.printEven();
System.out.println("print(DataStructureIterator) with "
+ "getEvenIterator");
ds.print(ds.getEvenIterator());
System.out.println("print(DataStructureIterator) with "
+ "anonymous class, odd indicies");
ds.print(
new DataStructure.DataStructureIterator() {
private int nextIndex = 1;
public boolean hasNext() {
return (nextIndex <= ds.size() - 1);
}
public Integer next() {
int retValue = ds.get(nextIndex);
nextIndex += 2;
return retValue;
}
}
);
System.out.println("print(Function) with lambda expressions");
ds.print(index -> {
if (index % 2 == 0) return Boolean.TRUE;
return Boolean.FALSE;
});
ds.print(index -> {
if (index % 2 == 0) return Boolean.FALSE;
return Boolean.TRUE;
});
System.out.println("print(Function) with method references");
ds.print(DataStructure::isEvenIndex);
ds.print(DataStructure::isOddIndex);
}
}