Java基础(21)

方法定义

public void bb(double num, Consumer consumer){
	consumer.accept(num);
}

调用

Test test=new Test();
test.bb(1000,num->System.out.println("消费了"+num+"元!"));

public class TestSupplier {
	public static void main(String[] args) {
		List res = getNumList(10, () -> (int) (Math.random() * 200));
		System.out.println(res);
	}
	
private static List getNumList(int num, Supplier supplier) {
	List res = new ArrayList<>();
	for (int i = 0; i < num; i++) {
		Integer tmp = supplier.get();
		res.add(tmp);
	}
	return res;
}
    }