C# 的 ==、Equals 與 JAVA 的 ==、equals

剛感到好奇，各在 C# 與 JAVA 寫測試程式。

• C#：

  Object myObj1 = 1;
  Object myObj2 = myObj1;
  Object myObj3 = 1;
  
  Console.WriteLine("myObj2.Equals(myObj1) = " + myObj2.Equals(myObj1));
  Console.WriteLine("myObj3.Equals(myObj1) = " + myObj3.Equals(myObj1));
  
  Console.WriteLine("(myObj2 == myObj1) = " + (myObj2 == myObj1));
  Console.WriteLine("(myObj3 == myObj1) = " + (myObj3 == myObj1));

  結果：

  myObj2.Equals(myObj1) = True
  myObj3.Equals(myObj1) = True
  (myObj2 == myObj1) = True
  (myObj3 == myObj1) = False

• JAVA：

  Object myObj1 = 1;
  Object myObj2 = myObj1;
  Object myObj3 = 1;
  
  System.out.println("myObj2.equals(myObj1) = " + myObj2.equals(myObj1));
  System.out.println("myObj3.equals(myObj1) = " + myObj3.equals(myObj1));
  
  System.out.println("(myObj2 == myObj1) = " + (myObj2 == myObj1));
  System.out.println("(myObj3 == myObj1) = " + (myObj3 == myObj1));

  結果：

  myObj2.equals(myObj1) = true
  myObj3.equals(myObj1) = true
  (myObj2 == myObj1) = true
  (myObj3 == myObj1) = true