该接口我有一个this.dataService.addData(this.newData).subscribe((ev:HttpEvent<any>)=>{
console.log("add data - response is ",ev);
if(ev.type === HttpEventType.Response) {
console.log('response from server: returning body '+ev.body);
let isResponseStructureOK: boolean = this.helper.validateServerResponseStructure(ev.body);
if (isResponseStructureOK) {
let response:ServerResponseAPI = ev.body;
console.log("received response from server: " + response.result);
let dialogComponentRef: ComponentRef<DialogBoxComponent> = this.maxFilesDialogContainerRef.createComponent(this.dialogFactory);
dialogComponentRef.instance.dialogMessage = response.result + ": " + response['additional-info'];
dialogComponentRef.instance.dialogID = "maxFilesDialog";
//TODOM - once this view gets added, I am not deleting it from the viewcontainer once the dialog's OK is pressed. Need to find a way to do this.
dialogComponentRef.instance.dialogShow();
} else {
console.log("received incorrect response structure from server: ", ev.body);
let dialogComponentRef: ComponentRef<DialogBoxComponent> = this.maxFilesDialogContainerRef.createComponent(this.dialogFactory);
dialogComponentRef.instance.dialogMessage = "Server error";
dialogComponentRef.instance.dialogID = "maxFilesDialog";
//TODOM - once this view gets added, I am not deleting it from the viewcontainer once the dialog's OK is pressed. Need to find a way to do this.
dialogComponentRef.instance.dialogShow();
}
}
else {
console.log("not response. ignoring");
}
});
和一个interface A。这是旧版代码，现在我尝试从impl类implementation class B返回另一个变量，而不更改方法签名。我在B类中创建了一个B。访问它的最佳方法是什么？我应该添加一个公共的getter函数来通过接口A还是直接在instance variable中调用getter？
示例代码：
B从public interface A{
}
public class B implements A{
private int a =100;
public int getA {
return a;
}
}
类访问a的最佳方法是什么？
答案 0 :(得分：0)
如果它仅特定于类B，并且不会被实现接口A的任何其他类使用，则应将其限制为类B，否则，如果它是所有实现A的通用用例，则您应该将访问器添加到接口A。
答案 1 :(得分：0)
这取决于您的情况。
如果B的变量是通用的（很少）与接口A相关联，则可以在接口A中创建一个getter方法。诸如SQL驱动程序接口中的Connection，{{ 1}}界面
在几乎其他情况下，实现B的变量仅特定于该实现，因此您应从B实例访问它。