//测试类
package test;
import java.util.ArrayList;
import java.util.List;
import org.junit.jupiter.api.Test;
public class TestLambda {
@Test
public void test() {
List<Person>list=new ArrayList<Person>();
list.add(new Person("张三",20,500));
list.add(new Person("李四",40,600));
list.add(new Person("赵四",35,500));
list.add(new Person("王五",36,500));
list.add(new Person("王七",30,600));
list.add(new Person("旺旺",31,700));
list.add(new Person("倪萍",35,500));
List<Person>personList=getPersonList(list,new GetInfoByAge());
System.out.println(list.toString());
System.out.println("personList=========="+personList);
personList.forEach(person->System.out.println("结果==="+person));
}
/**
* 匿名内部类实现
*/
@Test
public void test2() {
List<Person>list=new ArrayList<Person>();
list.add(new Person("张三",20,500));
list.add(new Person("李四",40,600));
list.add(new Person("赵四",35,500));
list.add(new Person("王五",36,500));
list.add(new Person("王七",30,600));
list.add(new Person("旺旺",31,700));
list.add(new Person("倪萍",35,500));
List<Person>list2=getPersonList(list,new MyPrivate<Person>() {
@Override
public boolean getInfo(Person t) {
// TODO Auto-generated method stub
return t.getAge()<=32;
}
});
System.out.println("list2===="+list2);
}
/**
* lambda表达式实现
*/
@Test
public void Test3() {
List<Person>list=new ArrayList<Person>();
list.add(new Person("张三",20,500));
list.add(new Person("李四",40,600));
list.add(new Person("赵四",35,500));
list.add(new Person("王五",36,500));
list.add(new Person("王七",30,600));
list.add(new Person("旺旺",31,700));
list.add(new Person("倪萍",35,500));
List<Person>list3=getPersonList(list,(e)->e.getAge()>=40);
System.out.println("list3======"+list3);
}
/**
* 判断方法
* @param list
* @param myPrivate
* @return
*/
public List<Person>getPersonList(List<Person>list,MyPrivate<Person> myPrivate){
List<Person>personList=new ArrayList<Person>();
for(Person person:list) {
if(myPrivate.getInfo(person)){
personList.add(person);
}
}
return personList;
}
}
接口
package test;
public interface MyPrivate<T> {
public boolean getInfo(T t);
}
实现类
package test;
public class GetInfoByAge implements MyPrivate<Person>{
@Override
public boolean getInfo(Person p) {
return p.getAge()>=35;
}
}