java - 在Java流中拆分对象

我想知道是否有可能在Stream中拆分对象。例如，对于此Employee:

public class Employee {

    String name;
    int age;
    double salary;

    public Employee(String name, int age, double salary) {
        this.name = name;
        this.age = age;
        this.salary = salary;
    }

    public String getName() { return name; }

    public int getAge() { return age; }

    public double getSalary() { return salary; }
}

我想在流中执行一些操作。为简单起见，让它像这样(假设我的代码体系结构不允许将其放在Employee类中，否则太容易了):

public void someOperationWithEmployee(String name, int age, double salary) {
    System.out.format("%s %d %.0f\n", name, age, salary);
}

现在看起来像这样:

Stream.of(new Employee("Adam", 38, 3000), new Employee("John", 19, 2000))
        // some conversations go here ...
        .forEach(e -> someOperationWithEmployee(e.getName, e.getAge(), e.getSalary));

问题是，是否可以在这样的流中放入一些代码？

Stream.of(new Employee("Adam", 38, 3000), new Employee("John", 19, 2000))
        // some conversations go here
        .forEach((a, b, c) -> someOperationWithEmployee(a, b, c));

我想达到什么目的？ -我认为，如果我可以映射一些对象字段，然后像.forEach(this::someOperationWithEmployee)这样处理它们，则代码的可读性将略有提高。

更新14.05.2015
毫无疑问，在这种情况下，将Employee对象传递给someOperationWithEmployee是最漂亮的解决方案，但有时我们在现实生活中无法做到这一点，因此应该是lambda的通用解决方案。

最佳答案

我不确定这是否符合您的需求，但可以稍作修改，而不检查某些类型。

您可以通过以下方式运行我的解决方案:

    Stream.of(new Employee("Adam", 38, 3000), new Employee("John", 19, 2000))
        .forEach(
                e->ArrayCaller.<TriConsumer<String, Integer, Double>>convert(e::getName, e::getAge, e::getSalary)
                                                                     .call((a, b, c) -> operation(a, b, c)));

它将调用“main”类的此简单方法:

private void operation(String name, int age, double salary) {
    System.out.format("%s %d %.0f\n", name, age, salary);
}

当然需要以下辅助类型:

/** Extending interfaces must have a method called consume with N args */
interface NConsumer {}

/*
 * Method must be called consume for reflection.
 *
 * You can define N interfaces like this.
 */
nterface TriConsumer<A, B, C> extends NConsumer {
    void consume(A a, B b, C c);
}

interface ArrayCaller<E extends NConsumer> {
    void call(E code);
    static <T extends NConsumer> ArrayCaller<T> convert(Supplier<?>...argSuppliers) {
        final Object[] args = new Object[argSuppliers.length];
        for (int i = 0; i < argSuppliers.length; i++) {
            args[i] = argSuppliers[i].get();
        }
        return new ArrayCaller<T>() {
            @Override
            public void call(T code) {
                for (Method m: code.getClass().getMethods()) {
                    if (m.getName().equals("consume")) {
                        try {
                            m.invoke(code, args);
                        } catch (IllegalAccessException
                                | IllegalArgumentException
                                | InvocationTargetException e) {
                            throw new RuntimeException(e);
                        }
                    }
                }
            }
        };
    }
}