我有两个类具有相同的方法,下面的方法应根据打勾的复选框访问两个类之一的方法,但是我在将IF语句中创建的对象传递到主体时遇到了问题该方法。有没有办法在不将方法主体复制到两个区域的情况下实现这一目标?这是代码:
public void populateSupplyChainTextFields() {
if (jDeliveryCheckBox.isSelected() == true) {
DeliveryCompany supplyChainMember = new DeliveryCompany();
supplyChainMember = theDeliveryCompanyList.Find(jSupplyChainSearchBox.getSelectedItem().toString());
} else {
Supplier supplyChainMember = new Supplier();
supplyChainMember = theSupplierList.Find(jSupplyChainSearchBox.getSelectedItem().toString());
}
jCategoryTextField.setText(supplyChainMember.getCategory());
jPriceTextField.setText(String.valueOf(supplyChainMember.getPrice()));
jUnitCostTextField.setText(String.valueOf(supplyChainMember.getUnitCost()));
编辑**
为确认起见,方法getBusinessName()既在供应商类中又在交付公司类中。
如果这是一个新手问题,我深表歉意,我对Java还是很陌生,对此表示感谢。
答案 0 :(得分:0)
最好从通用接口或抽象类继承DeliveryCompany和Supplier。如果这不起作用,则可以使用Object
类型作为最后的选择。
public Object populateSupplyChainTextFields() {
Object result = null;
if (jDeliveryCheckBox.isSelected() == true) {
DeliveryCompany supplyChainMember = new DeliveryCompany();
supplyChainMember = theDeliveryCompanyList.Find(jSupplyChainSearchBox.getSelectedItem().toString());
result = supplyChainMember
} else {
Supplier supplyChainMember = new Supplier();
supplyChainMember = theSupplierList.Find(jSupplyChainSearchBox.getSelectedItem().toString());
result = supplyChainMember
}
return result;
}
//Call the method
Object r = populateSupplyChainTextFields();
//Check type and take action
if (r instanceof DeliveryCompany){
DeliveryCompany supplyChainMember = (DeliveryCompany)r;
jCategoryTextField.setText(supplyChainMember.getCategory());
jPriceTextField.setText(String.valueOf(supplyChainMember.getPrice()));
jUnitCostTextField.setText(String.valueOf(supplyChainMember.getUnitCost())
}
答案 1 :(得分:0)
许多人在这里提到,最好的办法是使Supplier
和DeliveryCompany
实现注释接口或扩展公共基类。
如果您确实无法做到这一点,并且确实需要避免重复执行代码块,并且如果实际代码比发布的代码复杂,那么您可以让代码块共享一个变量
使用本地类来保存数据
public void populateSupplyChainTextFields() {
class Holder {
String category, price, unitCost;
Holder(String category, double price, double unitCost){
this.category = category;
this.price = String.valueOf(price);
this.unitCost = String.valueOf(unitCost);
}
}
Holder data;
if (jDeliveryCheckBox.isSelected()) {
DeliveryCompany supplyChainMember = new DeliveryCompany().Find(jSupplyChainSearchBox.getSelectedItem().toString());
data = new Holder(supplyChainMember.getCategory(), supplyChainMember.getPrice(), supplyChainMember.getUnitCost());
} else {
Supplier supplyChainMember = new Supplier().Find(jSupplyChainSearchBox.getSelectedItem().toString());
data = new Holder(supplyChainMember.getCategory(), supplyChainMember.getPrice(), supplyChainMember.getUnitCost());
}
jCategoryTextField.setText(data.category);
jPriceTextField.setText(data.price);
jUnitCostTextField.setText(data.unitCost);
使用本地类只是我的偏爱,您可以选择使用诸如地图之类的东西(当然,引入记录会很方便):
Map<String, String> data;
if (jDeliveryCheckBox.isSelected()) {
DeliveryCompany supplyChainMember = ...
data = Map.of("category, supplyChainMember.getCategory(),
"price", String.valueOf(supplyChainMember.getPrice()),
"unitCost", String.valueOf(supplyChainMember.getUnitCost()));
} else {
Supplier supplyChainMember = ...
data = Map.of("category, supplyChainMember.getCategory(),
"price", String.valueOf(supplyChainMember.getPrice()),
"unitCost", String.valueOf(supplyChainMember.getUnitCost()));
}
jCategoryTextField.setText(data.get("category"));
jPriceTextField.setText(data.get("price"));
jUnitCostTextField.setText(data.get("unitCost"));