java lambda表达式检查list集合是否存在某个值

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class Test {
    public static void main(String[] args) {
        People p1 = new People("b", "b");
        People p2 = new People("a", "b11");
        List<People> list = new ArrayList<People>();
        list.add(p1);
        list.add(p2);

        boolean bool = list.stream().anyMatch(a -> a.getName().equals("a") || a.getNick().equals("a"));
        System.out.println(bool);
        
        List<People> data = list.stream().filter(a -> a.getName().equals("a") || a.getNick().equals("a"))
                .collect(Collectors.toList());
        if(data!=null && data.size() > 0) {
            for (int i = 0; i < data.size(); i++) {
                System.out.println(data.get(i).getName() + "---" + data.get(i).getNick());
            }
        }
    }

}

public class People
{
    private String name;
    private String nick;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getNick() {
        return nick;
    }
    public void setNick(String nick) {
        this.nick = nick;
    }
    public People(String name, String nick) {
        super();
        this.name = name;
        this.nick = nick;
    }
    
}