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Added example of Method Reference for a super method of a particular object and fixed for instance method of an arbitrary object of a particular type.

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This commit is contained in:
giuseppe.bueti 2016-01-26 00:14:08 +01:00
parent fb4f9b36a5
commit 089f30d53a
3 changed files with 69 additions and 2 deletions
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12
core-java-8/src/main/java/com/baeldung/doublecolon/Computer.java
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@ -44,6 +44,18 @@ public class Computer {
this.healty = healty;
}
public void turnOnPc() {
System.out.println("Computer turned on");
}
public void turnOffPc() {
System.out.println("Computer turned off");
}
public Double calculateValue(Double initialValue) {
return initialValue/1.50;
}
@Override
public String toString() {
return "Computer{" + "age=" + age + ", color='" + color + '\'' + ", healty=" + healty + '}';

35
core-java-8/src/main/java/com/baeldung/doublecolon/MacbookPro.java Normal file
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@ -0,0 +1,35 @@
package com.baeldung.doublecolon;
import java.util.function.Function;
public class MacbookPro extends Computer{
public MacbookPro(int age, String color) {
super(age, color);
}
public MacbookPro(Integer age, String color, Integer healty) {
super(age, color, healty);
}
@Override
public void turnOnPc() {
System.out.println("MacbookPro turned on");
}
@Override
public void turnOffPc() {
System.out.println("MacbookPro turned off");
}
@Override
public Double calculateValue(Double initialValue){
Function<Double,Double> function = super::calculateValue;
final Double pcValue = function.apply(initialValue);
System.out.println("First value is:" +pcValue);
return pcValue + (initialValue/10) ;
}
}

24
core-java-8/src/test/java/com/baeldung/doublecolon/TestComputerUtils.java
View File

@ -22,7 +22,7 @@ public class TestComputerUtils {
}
@Test
public void testFilter() {
public void testConstructorReference() {
Computer c1 = new Computer(2015, "white");
Computer c2 = new Computer(2009, "black");
@ -53,7 +53,7 @@ public class TestComputerUtils {
}
@Test
public void testRepair() {
public void testStaticMethodReference() {
Computer c1 = new Computer(2015, "white", 35);
Computer c2 = new Computer(2009, "black", 65);
@ -66,4 +66,24 @@ public class TestComputerUtils {
Assert.assertEquals("Computer repaired", new Integer(100), c1.getHealty());
}
@Test
public void testInstanceMethodArbitraryObjectParticularType() {
Computer c1 = new Computer(2015, "white", 35);
Computer c2 = new MacbookPro(2009, "black", 65);
List<Computer> inventory = Arrays.asList(c1, c2);
inventory.forEach(Computer::turnOnPc);
}
@Test
public void testSuperMethodReference() {
final TriFunction<Integer, String, Integer, MacbookPro> integerStringIntegerObjectTriFunction = MacbookPro::new;
final MacbookPro macbookPro = integerStringIntegerObjectTriFunction.apply(2010, "black",100);
Double initialValue=new Double(999.99);
final Double actualValue = macbookPro.calculateValue(initialValue);
Assert.assertEquals(766.659, actualValue,0.0);
}
}