Lambda表达式--综合案例

集合遍历-forEach

public class Example3 {
    public static void main(String[] args) {
        //集合的遍历
        ArrayList<Integer> integerList = new ArrayList<>();
        Collections.addAll(integerList, 1, 23, 4, 5, 6, 7, 8, 9, 0, 10);
        //输出集合中的偶数
        integerList.forEach(ele -> {
               if(ele%2==0){
                   System.out.println(ele);
               }
        });
    }
}

 

集合删除 - removeIf

public class Example4 {
    public static void main(String[] args) {
        //需求, 删除年龄大于10的人
        ArrayList<Person> people = new ArrayList<>();
        people.add(new Person("小明", 10));
        people.add(new Person("小嘎", 13));
        people.add(new Person("小红", 9));
        people.add(new Person("小强", 6));
        people.add(new Person("老王", 27));
        people.add(new Person("老表", 28));

        //一般做法
        Iterator<Person> iterator = people.iterator();
        while (iterator.hasNext()){
            Person person = iterator.next();
            if(person.age>=10){
                iterator.remove();
            }
        }
        //Lambda表达式
        people.removeIf(ele -> ele.age >=10);
        System.out.println(people);
    }
}

 

线程实例化

public class Example5 {
    public static void main(String[] args) {
        //需求: 通过lambda表达式, 实现实例化一个线程
        Thread thread = new Thread(() -> {
            for(int i = 0 ; i < 100 ; i++){
                System.out.println(i);
            }
        });
        thread.start();
    }
}