//黄色部分为过滤条件
list.stream().filter(user-> user.getId() > 5 && "1组".equals(user.group)).collect(Collectors.toList());
示例：
public class HelloWorld {
public static void main(String[] args) {
Random random = new Random();
List<User> list = new ArrayList<>();
for(int i=1;i<=20;i++) {
String group = (random.nextInt(3) + 1) + "组";//1-3组随机
User u = new User(i, "用户-" + i, group);
list.add(u);
}
System.out.println("过滤前：" + list);
//按条件过滤
List<User> filterList = list.stream().filter(user -> user.getId() > 5 && "1组".equals(user.group)).collect(Collectors.toList());
System.out.println("过滤 后：" + filterList);
}
private static class User{
Integer id;
String name;
String group;
public User(Integer id, String name, String group) {
this.id = id;
this.name = name;
this.group = group;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGroup() {
return group;
}
public void setGroup(String group) {
this.group = group;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", group='" + group + '\'' +
'}';
}
}
}
执行结果：
过滤前：[User{id=1, name='用户-1', group='2组'}, User{id=2, name='用户-2', group='1组'}, User{id=3, name='用户-3', group='2组'}, User{id=4, name='用户-4', group='2组'}, User{id=5, name='用户-5', group='3组'}, User{id=6, name='用户-6', group='1组'}, User{id=7, name='用户-7', group='3组'}, User{id=8, name='用户-8', group='2组'}, User{id=9, name='用户-9', group='1组'}, User{id=10, name='用户-10', group='1组'}, User{id=11, name='用户-11', group='2组'}, User{id=12, name='用户-12', group='2组'}, User{id=13, name='用户-13', group='2组'}, User{id=14, name='用户-14', group='2组'}, User{id=15, name='用户-15', group='2组'}, User{id=16, name='用户-16', group='3组'}, User{id=17, name='用户-17', group='1组'}, User{id=18, name='用户-18', group='1组'}, User{id=19, name='用户-19', group='1组'}, User{id=20, name='用户-20', group='3组'}]
过滤 后：[User{id=6, name='用户-6', group='1组'}, User{id=9, name='用户-9', group='1组'}, User{id=10, name='用户-10', group='1组'}, User{id=17, name='用户-17', group='1组'}, User{id=18, name='用户-18', group='1组'}, User{id=19, name='用户-19', group='1组'}]