Passion of IT

Java 1.8 What’s new

Interface with default method


public interface InterfaceDefault {
default void foo(){
System.out.println("Calling A.foo()");
}

 

array parallel sort


int[] myArray=new int [10];
for (int i=0;i<10;i++)
myArray[i]= (int) (Math.random()*100);
Arrays.parallelSort(myArray);

lambda expressions


Runnable java8Runner = () ->{

System.out.println("I am running");
};
java8Runner.run();

new timer type


ZoneId zone = ZoneId.of("Europe/Berlin");
Clock clock = Clock.system(zone);
System.out.print(clock.millis());
LocalDate date = LocalDate.now();
System.out.printf(" %s-%s-%s",
date.getYear(), date.getMonthValue(), date.getDayOfMonth()
);

 

Stream and paralllel stream like groovy closures


Function<Person, Job> mapPersonToJob = new Function<Person, Job>() {
public Job apply(Person person) {
Job job = new Job(person.getPersonId(), person.getJobDescription());
return job;
}
};

java.util.function.Predicate<? super Person> p1 = e -> e.getPersonId() < 6 ;
java.util.function.Predicate<? super Person> p2 = e -> e.getPersonId() < 3 ;
boolean intMap = persons.parallelStream().allMatch(p1);

System.out.println("value:"+intMap);
List <Person> persone = persons.parallelStream().filter(p2).collect(Collectors.toList());

List<Job> jobs = persons.parallelStream().map(mapPersonToJob)
.collect(Collectors.toList());

Job job = mapPersonToJob.apply(person);

 

 

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