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
Tweet 20
fb-share-icon20