PCB类型中的placeComponent()方法不适用于参数(HardwareComponent)

Question

我试图将硬件组件添加到包含对象数组的PCB中，但无法将对象传递给数组。这是我的第一个Java项目，所以这里完全是新手。请帮帮忙！

public class PCB {
    private Collection<HardwareComponent> hwComponents = new Vector<HardwareComponent>();
    private Collection<CircuitPath> connections = new Vector<CircuitPath>();

    public void placeComponent(<HardwareComponent> hw) {
        hwComponents.add(hw);
    }

还有我的主菜

 public class Configurator {

    public static void main(String[] args) {

        PCB pcb = new PCB();

        HardwareComponent c1 = new Capacitor("cap1", 0.55f);
        HardwareComponent c2 = new Capacitor("cap2", 0.22f);
        HardwareComponent c3 = new Capacitor("cap3", 0.50f);
        HardwareComponent c4 = new Capacitor("cap4", 0.75f);
        HardwareComponent r1 = new Resistor("res1", 0.14f);
        HardwareComponent r2 = new Resistor("res2", 0.18f);
        HardwareComponent r3 = new Resistor("res3", 0.17f);
        HardwareComponent r4 = new Resistor("res4", 0.10f);

        pcb.placeComponent(c1);

我得到了这个错误: PCB类型中的placeComponent()方法不适用于参数(HardwareComponent)

不知道从这里到哪里，我需要为类PCB创建一个单独的构造函数还是如何将HardwareComponent传递给placeComponent方法？

提前谢谢你

Answer 1

方法签名是错误的public void placeComponent(<HardwareComponent> hw)。

尝试使用public void placeComponent(HardwareComponent hw)