有沒有辦法找出哪個IF條件'觸發'入口if（）{} block？

Question

在這個例子中：

if (object instanceof SomeThing || object instanceof OtherThing) { 
    System.out.println("this block was entered because of: " + **____**) 
} 

我可以檢查是否真正的條件是什麼或OtherThing？

編輯：我試圖避免條件分離。

謝謝。

Answer 1

重構在這兩種情況下的功能的共同步驟，然後：

if (object instanceof SomeThing) { 
    // It's SomeThing 
    System.out.println("Got here because it's SomeThing"); 
    commonStuff(); 
} 
else if (object instanceof OtherThing) { 
    // It's OtherThing 
    System.out.println("Got here because it's OtherThing"); 
    commonStuff(); 
} 

---

回覆您的編輯：

編輯：我是試圖避免條件分離。

那麼你有以下選擇：

if (object instanceof SomeThing || object instanceof OtherThing) { 
    System.out.println("Got here because it's " + 
     (object instanceof SomeThing) ? "SomeThing" : "OtherThing") 
    ); 
} 

或者

boolean isSomeThing: 
if ((isSomeThing = object instanceof SomeThing) || object instanceof OtherThing) { 
    System.out.println("Got here because it's " + 
     isSomeThing ? "SomeThing" : "OtherThing") 
    ); 
} 

Answer 2

嘗試

if (object instanceof SomeThing) { 
     System.out.println("this block was entered because of: " + **SomeThing ____**) 
    } 
    else if(object instanceof OtherThing){ 
    System.out.println("this block was entered because of: " + **OtherThing____**) 
    } 
    else{ 
    System.out.println("********nothing satisfied) 
    } 

Answer 3

if (object instanceof SomeThing || object instanceof OtherThing) { 
    System.out.println(object instanceof SomeThing );// if this print false then object is type of OtherThing 

    System.out.println("this block was entered because of: " + **____**) 
} 

Answer 4

嘗試使用三元運算符：

if (object instanceof SomeThing || object instanceof OtherThing) { 
     System.out.println("this block was entered because of: " 
      + (object instanceof SomeThing? "SomeThing" : "OtherThing")); 
    } 

Answer 5

System.out.println("This block was entered because object is instance of SomeThing or OtherThing."); 

作爲替代：

System.out.println("This block was entered because object is " + object.getClass().getName()); 

或者非常不可讀：

boolean other = false; 
if (object instanceof SomeThing || (other = true) || ....) { 
    System.out.println("because of " + other?"OtherThing":"SomeThing") 
}