Java2 days 2013-lambda

Sep 22, 2014Download as PPTX, PDF0 likes402 views

This document provides instructions for a hands-on lab to learn about Java lambda expressions. It outlines how to set up the environment with Java 8 and an IDE. It describes rules for completing tasks that involve fixing compilation errors and writing lambda code. The tasks cover internal vs external iteration, filtering and collecting, mapping, and method references. Mapping examples show using lambda expressions and method references, and how default methods in interfaces work in Java 8.

Lambda-Tutorial
Hands-on-Lab
Dmitry Alexandrov
Martin Toshev
Ivan St. Ivanov
Mani Sarkar

Contents:
• Environment setup
• Rules
• Tasks:
• Internal vs External Iteration
• Filtering and Collecting
• Mapping
• Method References

Environment setup:
• Java 8
https://jdk8.java.net/lambda/
… build yours from OpenJDK repo
• IntelliJ IDEA CE
http://www.jetbrains.com/idea/free_java_ide.html
Eclipse in current state is NOT recommended!
• Vi or emacs for geeks

Rules:
• We have several classes and test for them.
• Fix compilation errors in both classes and tests
• Find “// your code here” and write the code!
• Run the tests. Try to make them green!
• … read the comments.. They are useful!

Internal vs External Iteration :
• External
for (Shape shape: myShapes) {
shape.setColor(RED);
}
• Internal
myShapes.forEach(shape -> shape.setColor(RED));

Filtering and Collecting :
• Java7
for (String s: otherThings) {
if (satisfiesSomeCondition(s)) {
things.add(s);
}
}
• Java8
otherThings.stream()
.filter(s -> satisfiesSomeCondition(s))
.collect(Collectors.toList());

Mapping :
• Java7
List<String> upperCaseStrings = new ArrayList<>();
for (String s: mixedCaseStrings) {
upperCaseStrings.add(s.toUpperCase());
}
• Java8
mixedCaseStrings.stream()
.map(s -> s.toUpperCase())
.collect(Collectors.toList());

Mapping :
Lambda expression:
myStrings.map(s -> s.toUpperCase());
Using method reference:
myStrings.map(String::toUpperCase);
Can be used with:
• Static method belonging to a particular class
• Instance method bound to a particular object instance
• Instance method bound to a particular class
• Constructor belonging to a particular class

Default Method:
• Java8
public interface A {
default void foo(){
System.out.println("Calling A.foo()");
}
}
public class Clazz implements A {
}
Clazz clazz = new Clazz();
clazz.foo(); // Calling A.foo()

Default Method:
• Java8
public class Clazz2 implements A {
@Override
public void foo(){
System.out.println("Calling A.foo()");
}
}
Clazz2 clazz2 = new Clazz2();
clazz2.foo(); // Calling A.foo()

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1. Lambda-Tutorial Hands-on-Lab Dmitry Alexandrov Martin Toshev Ivan St. Ivanov Mani Sarkar

2. Contents: • Environment setup • Rules • Tasks: • Internal vs External Iteration • Filtering and Collecting • Mapping • Method References

3. Environment setup: • Java 8 https://jdk8.java.net/lambda/ … build yours from OpenJDK repo • IntelliJ IDEA CE http://www.jetbrains.com/idea/free_java_ide.html Eclipse in current state is NOT recommended! • Vi or emacs for geeks

4. Environment setup: • Take the code • Import as a Maven project • Set Java8 profile (source compatibility) • Run ConfigureYourLambdaBuildOfJdk and see if it compiles!

5. Rules: • We have several classes and test for them. • Fix compilation errors in both classes and tests • Find “// your code here” and write the code! • Run the tests. Try to make them green! • … read the comments.. They are useful!

6. The tasks

7. Internal vs External Iteration : • External for (Shape shape: myShapes) { shape.setColor(RED); } • Internal myShapes.forEach(shape -> shape.setColor(RED));

8. Filtering and Collecting : • Java7 for (String s: otherThings) { if (satisfiesSomeCondition(s)) { things.add(s); } } • Java8 otherThings.stream() .filter(s -> satisfiesSomeCondition(s)) .collect(Collectors.toList());

9. Mapping : • Java7 List<String> upperCaseStrings = new ArrayList<>(); for (String s: mixedCaseStrings) { upperCaseStrings.add(s.toUpperCase()); } • Java8 mixedCaseStrings.stream() .map(s -> s.toUpperCase()) .collect(Collectors.toList());

10. Mapping : Lambda expression: myStrings.map(s -> s.toUpperCase()); Using method reference: myStrings.map(String::toUpperCase); Can be used with: • Static method belonging to a particular class • Instance method bound to a particular object instance • Instance method bound to a particular class • Constructor belonging to a particular class

11. Default Method: • Java8 public interface A { default void foo(){ System.out.println("Calling A.foo()"); } } public class Clazz implements A { } Clazz clazz = new Clazz(); clazz.foo(); // Calling A.foo()

12. Default Method: • Java8 public class Clazz2 implements A { @Override public void foo(){ System.out.println("Calling A.foo()"); } } Clazz2 clazz2 = new Clazz2(); clazz2.foo(); // Calling A.foo()

13. Now have fun!!!

Java2 days 2013-lambda

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