Anki Deck Changes

Note 1: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Cloze
GUID: Ap->IRX#;C

added

New Note

Front

If "obj = null" then "obj instanceof String" returns false (never an exception)

Back

If "obj = null" then "obj instanceof String" returns false (never an exception)

Field-by-field Comparison

Field	Before	After
Text		<div><code><span style="font-family: "Liberation Sans";">If "</span>obj = null"</code> then "<code>obj instanceof String"</code> returns {{c1::false (never an exception)}}</div>

Tags: ETH::1._Semester::EProg::10._Inheritance::2._Polymorphism::1._Instance_Of

Note 2: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Cloze
GUID: D3~R~/O`**

added

New Note

Front

instanceof tests whether an instance has a same dynamic type or if it implements an interface.

Back

instanceof tests whether an instance has a same dynamic type or if it implements an interface.

Field-by-field Comparison

Field	Before	After
Text		<div><code>instanceof</code> tests whether {{c1::an instance has a same <b>dynamic type</b>}} or {{c1::if it implements an <b>interface</b>}}.</div>

Tags: ETH::1._Semester::EProg::10._Inheritance::2._Polymorphism::1._Instance_Of

Note 3: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: G#$#7KW!b}

added

New Note

Front

Instance of can result in a Compile / Runtime / No error?

Back

Instance of can result in a Compile / Runtime / No error?

instanceof never throws an exception, just compile errors.

Field-by-field Comparison

Field	Before	After
Front		Instance of can result in a Compile / Runtime / No error?
Back		<div><code>instanceof</code> never throws an exception, just <b>compile</b> errors.</div>

Tags: ETH::1._Semester::EProg::10._Inheritance::2._Polymorphism::1._Instance_Of

Note 4: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: I0s;#,Wh%?

added

New Note

Front

Compile/Runtime/No Error

Back

Compile/Runtime/No Error

No error, valid for loop.

Field-by-field Comparison

Field	Before	After
Front		<img src="paste-f485e58a003acd0f29903efd63e9440b14068a5c.jpg"><br>Compile/Runtime/No Error
Back		No error, valid for loop.

Tags: ETH::1._Semester::EProg::3._Control_Structures::4._Loops::1._For_Loops

Note 5: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: IKMb!{98`

added

New Note

Front

Compile/Runtime/No Error?

Back

Compile/Runtime/No Error?

Valid for loop.

Field-by-field Comparison

Field	Before	After
Front		<img src="paste-e33a7d35e8694abacbdbd499304129858fb8fe03.jpg"><br>Compile/Runtime/No Error?
Back		Valid for loop.

Tags: ETH::1._Semester::EProg::3._Control_Structures::4._Loops::1._For_Loops

Note 6: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: LHfofYY0cF

added

New Note

Front

Can we ust ++ and -- on floats and doubles?

Back

Can we ust ++ and -- on floats and doubles?

Yes, that is allowed and increments by 1.0.

Field-by-field Comparison

Field	Before	After
Front		Can we ust <b>++</b> and <b>--</b> on floats and doubles?
Back		Yes, that is allowed and increments by 1.0.

Tags: ETH::1._Semester::EProg::2._First_Java_Programs::3._Simple_Calculations::2._Expressions_over_Basic_Types

Note 7: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Cloze
GUID: MpWDjk%Tfz

added

New Note

Front

Instance of returns true if:

Implements the interface
Is of the same dynamic type
Is a subtype of the dynamic type

Back

Instance of returns true if:

Implements the interface
Is of the same dynamic type
Is a subtype of the dynamic type

Field-by-field Comparison

Field	Before	After
Text		Instance of returns true if:<br><ul><li>{{c1::Implements the interface}}</li><li>{{c2::Is of the same dynamic type}}</li><li>{{c3::Is a subtype of the dynamic type}}</li></ul>

Tags: ETH::1._Semester::EProg::10._Inheritance::2._Polymorphism::1._Instance_Of

Note 8: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Cloze
GUID: bxDOHVL#p]

added

New Note

Front

A compile error can result from an instance of check if:

Primitive types cannot be used with Instance Of
Cannot check for generics, type erasure prevents this.
t instanceof List<String will not compile as it cannot check the parametrised type
Comparing siblings:
Animal -> Dog and Animal -> Cat.
Check for animal instanceof Dog/Cat allowed, but dog = new Dog(); dog instanceof Cat throws compile error.
Interface checks for final classes (that don't implement that interface).
A final class cannot implement an interface in a subclass, thus error
Animal a = getanimal() could get a Dog which
might implement List thus a instanceof List is not a compile error.

Back

A compile error can result from an instance of check if:

Primitive types cannot be used with Instance Of
Cannot check for generics, type erasure prevents this.
t instanceof List<String will not compile as it cannot check the parametrised type
Comparing siblings:
Animal -> Dog and Animal -> Cat.
Check for animal instanceof Dog/Cat allowed, but dog = new Dog(); dog instanceof Cat throws compile error.
Interface checks for final classes (that don't implement that interface).
A final class cannot implement an interface in a subclass, thus error
Animal a = getanimal() could get a Dog which
might implement List thus a instanceof List is not a compile error.

Field-by-field Comparison

Field	Before	After
Text		A compile error can result from an <b>instance of </b>check if:<br><ul><li>{{c1::<i><b>Primitive</b></i> types cannot be used with Instance Of}}</li><li>{{c2::Cannot check for <b><em>generics</em></b>, type erasure prevents this.<br><code>    t instanceof List<String</code> will not compile as it cannot check the parametrised type}}</li><li>{{c3::Comparing <i><b>siblings</b></i>:<br><div><code>    Animal -> Dog</code> and <code>Animal -> Cat</code>. <br>         Check for <code>animal instanceof Dog/Cat</code> allowed, but <code>dog = new Dog(); dog instanceof Cat</code> throws compile error.}}</div></li><li><div>{{c4::Interface checks for <i><code>final</code> classes</i> (that don't implement that interface).<br>         A final class cannot implement an interface in a subclass, thus error<br>         <code>Animal a = getanimal()</code> could get a <code>Dog</code> which <br>         might <code>implement List</code> thus <code>a instanceof List</code> is not a compile error.}}</div></li></ul>

Tags: ETH::1._Semester::EProg::10._Inheritance::2._Polymorphism::1._Instance_Of

Note 9: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: fJL&tF*QW&

added

New Note

Front

Compile/Runtime/no Error

Back

Compile/Runtime/no Error

No error, valid for loop

Field-by-field Comparison

Field	Before	After
Front		<img src="paste-e0cbcc8d646d0785d63ce579c103d7fcfead5a58.jpg"><br>Compile/Runtime/no Error
Back		No error, valid for loop

Tags: ETH::1._Semester::EProg::3._Control_Structures::4._Loops::1._For_Loops

Note 10: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Cloze
GUID: i2g|!nNV|m

added

New Note

Front

We can omit everything but the semicolons in the for loop for(...)

Back

We can omit everything but the semicolons in the for loop for(...)

Field-by-field Comparison

Field	Before	After
Text		We can omit everything but {{c1::the semicolons}} in the for loop <b>for(...)</b>

Tags: ETH::1._Semester::EProg::3._Control_Structures::4._Loops::1._For_Loops

Note 11: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: osPOmm:i4.

added

New Note

Front

Compile/Runtime/No Error

Back

Compile/Runtime/No Error

No error, valid for loop.

Field-by-field Comparison

Field	Before	After
Front		<img src="paste-6451454cfb845d5c319df053e0bf4d13f446b8b5.jpg"><br>Compile/Runtime/No Error
Back		No error, valid for loop.

Tags: ETH::1._Semester::EProg::3._Control_Structures::4._Loops::1._For_Loops

Note 12: ETH::EProg

Deck: ETH::EProg
Note Type: Horvath Classic
GUID: pycoxP)lJk

added

New Note

Front

10 / -2 in Java gives the result 5 or -5?

Back

10 / -2 in Java gives the result 5 or -5?

-5 as integer division also supports negatives.

Field-by-field Comparison

Field	Before	After
Front		<b>10 / -2</b> in Java gives the result <b>5 </b>or <b>-5</b>?
Back		<b>-5</b> as integer division also supports negatives.

Tags: ETH::1._Semester::EProg::2._First_Java_Programs::3._Simple_Calculations::2._Expressions_over_Basic_Types

Note 1: ETH::EProg

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Note 2: ETH::EProg

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Note 3: ETH::EProg

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Note 5: ETH::EProg

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Note 6: ETH::EProg

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Note 7: ETH::EProg

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Note 8: ETH::EProg

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Note 9: ETH::EProg

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