java利用linq4j实现linq

public class Person implements Comparable<Person>{
	public int Age;
	public String Name;
	public boolean Sex;

	public Person(int age, String name, boolean sex) {
		super();
		Age = age;
		Name = name;
		Sex = sex;
	}

	@Override
	public int compareTo(Person other) {
		int result=Name.compareTo(other.Name);
		return result;
	}

public class LinqTest {
	@Test
	public void name() {
		Person p1=new Person(21,"21",true);
		Person p2=new Person(22,"22",false);
		Person p4=new Person(23,"24",true);
		Person p3=new Person(23,"23",true);
		
		List<Person> list=new ArrayList<>();
		list.add(p1);
		list.add(p2);
		list.add(p3);
		list.add(p4);
		
		
		
		List<String> nameList= Linq4j.asEnumerable(list).where(new Predicate1<Person>() {
			public boolean apply(Person arg0) {
                //只要sex为true的
				return arg0.Sex;
			}
		}).select(new Function1<Person, String>() {

			public String apply(Person arg0) {
				 //只要Person的name字段，
				return arg0.Name;
			}
		}).orderByDescending(new Function1<String, String>() {

			public String apply(String arg0) {
				//降序排列
				return arg0;
			}
		}).toList();

		assertEquals(3, nameList.size());
		assertEquals("24", nameList.get(0));
		assertEquals("23", nameList.get(1));
		assertEquals("21", nameList.get(2));
		
		
		
		
		List<Person> list2= Linq4j.asEnumerable(list).where(new Predicate1<Person>() {
			public boolean apply(Person arg0) {
                //只要sex为true的
				return arg0.Sex;
			}
		}).select(new Function1<Person, Person>() {

			public Person apply(Person arg) {
				return arg;
			}
		}).orderByDescending(new Function1<Person, Person>() {

			public Person apply(Person arg) {
				//降序排列
				return arg;
			}
		}).toList();
		
		assertEquals(3, list2.size());
		assertEquals(p4, list2.get(0));
		assertEquals(p3, list2.get(1));
		assertEquals(p1, list2.get(2));
		
	}

}

也可以参考：https://github.com/huangyunbin/codes/tree/master/src/main/java/com/hyb/util/linq