列出Java stream findany所需的帮助

Question

我有一个包含客户的对象。名称属性。我想反复浏览一下客户名单，看看他们的名字是不是“乔”还是“鲍勃”

我如何使用Java stream/find any来识别这些名字中是否有“Joe”或“Bob”呢

 boolean nameCheck = customers.stream().anyMatch(!c -> c.getName().equals("Joe") ||  !c.getName().equals("Bob"))

基本上，我想找到最好的方法返回一个布尔值，告诉我所有的客户都叫Joe或Bob。非常感谢您的帮助

Answer 1

试试.allMatch(p-> p.getName().matches("Joe|Bob"))

    public class Main {
    public static void main(String[] args) {
        ArrayList<Customer> customers =   new ArrayList<>(asList(new Customer("Joe"), new Customer("Bob")));

        customers.stream().map(Customer::getName).forEach(System.out::println);//print list
        Boolean allCustomersAreJoeOrBob =  customers.stream().allMatch(p-> p.getName().matches("Joe|Bob"));
        System.out.println("allCustomersAreJoeOrBob: "+allCustomersAreJoeOrBob+"\n");

        Customer sarasa = new Customer("Sarasa");
        customers.add(sarasa);
        customers.stream().map(Customer::getName).forEach(System.out::println);//print list
        allCustomersAreJoeOrBob =  customers.stream().allMatch(p-> p.getName().matches("Joe|Bob"));
        System.out.println("allCustomersAreJoeOrBob: "+allCustomersAreJoeOrBob+"\n");

        customers.remove(sarasa);
        customers.add(new Customer("Joe"));
        customers.stream().map(Customer::getName).forEach(System.out::println);//print list
        allCustomersAreJoeOrBob =  customers.stream().allMatch(p-> p.getName().matches("Joe|Bob"));
        System.out.println("allCustomersAreJoeOrBob: "+allCustomersAreJoeOrBob+"\n");
    }
}

结果：

Joe
Bob
allCustomersAreJoeOrBob: true

Joe
Bob
Sarasa
allCustomersAreJoeOrBob: false

Joe
Bob
Joe
allCustomersAreJoeOrBob: true