guava学习--FluentIterable

public class FluentIterableTest {

public static void main(String[] args) {

Man man1 = new Man("Jack Miller", 18);

Man man11 = new Man("Jack Miller", 18);

Man man2 = new Man("Roy Miller", 18);

Man man3 = new Man("Lily Miller", 11);

Man man4 = new Man("Rose Miller", 5);

Man man5 = new Man("Mike Chen", 34);

List<Man> manList = ImmutableList.of(man1, man11, man2, man3, man4, man5);

Set<Man> mans =  FluentIterable.from(manList).toSet();

System.out.println(mans.size());

//转换

List<String> transformed = FluentIterable.from(manList).transform(new Function<Man, String>() {

@Override

public String apply(Man input) {

return Joiner.on('#').join(input.getName(), input.getAge());

}

}).toList();

System.out.println(transformed);

// 组合Predicate条件

Predicate<Man> predicate = Predicates.alwaysTrue();

predicate = Predicates.and(predicate, new NamePredicate("Chen"));

predicate = Predicates.and(predicate, new AgePredicate(15));

// 使用FluentIterable过滤元素，返回一个Iterable[]

Iterable<Man> manIterable = FluentIterable.from(manList).filter(predicate).limit(3)

.transform(new Function<Man, Man>() {

@Override

public Man apply(Man man) {

man.setAge(man.getAge() * 2);

return man;

}

});

System.out.println(manIterable);

}

}

class Man {

private String name;

private int age;

public Man(String name, int age) {

this.name = name;

this.age = age;

}

public String getName() {

return name;

}

public int getAge() {

return age;

}

public void setName(String name) {

this.name = name;

}

public void setAge(int age) {

this.age = age;

}

@Override

public String toString() {

return name + " is " + age + " years old";

}

}

class AgePredicate implements Predicate<Man> {

private int minAge;

public AgePredicate(int minAge) {

this.minAge = minAge;

}

@Override

public boolean apply(Man man) {

if (man.getAge() < minAge)

return false;

return true;

}

}

class NamePredicate implements Predicate<Man> {

private String illegalName;

public NamePredicate(String illegalName) {

this.illegalName = illegalName;

}

@Override

public boolean apply(Man man) {

if (man.getName().contains(illegalName))

return false;

return true;

}

}