java 2 2

SomeEnumValue.valueOf("thename");

throws exception

No

Season.Fall doesnt work, should be FALL
Enum values cannot be compared with int

within the enum class: public abstract...
-> has to be implemented by all enum-types

• can be declared public, protected, package-private or private
• can extend any class or implement interfaces
• can be marked abstract or final
• cannot declare static fields or methods except for static final fields
• can access members of the outer class including private members

like a top-level-class except for:

• the nesting creates a namespace because the enclosing class name must be used to refer to it
• can be made private or use one of the other access modifiers to encapsulate it
• enclosing class can refer to the fields and methods of the static nested class

• do not have an access modifier
• cannot be declared static and cannot declare static fields or methods except for static final fields
• have access to all fields and methods of the enclosing class
• can access local variables if the variables are final or effectively final

• method may be declared only within an interface
• methoid must be marked with default keyword and include a method body
• method is assumed to be public
• method cannot be marked abstract, final or static
• method may be overridden by a class that implements the interface
• if a class inherits two or more default mehtods with the same method signature, then the class must override the method

walk.super.getSpeed();

• method must be marked with the static keyword and include a method body
• method without an access modifier is assumed to be public
• method cannot be marked abstract or final
• method is not inherited and cannot be accessed in a class implementing the interface without a reference to the interface name

• private interface method must be marked with the private modifier and include a method body
• private interface method may be called only by default and private (non static methods within the interface definition

• a private static method must be marked with private and static modifiers and include a method body
• a private static interface method may be called only by other methods without the interface definition

single abstract method 

the methods inherited by Object

you can use var inside a lambda parameter list but if a var is used for one of the types in the parameter list then it must be used fo all parameters in the list

Nein

Nein, Path.toRealPath() bspw nicht

Symbolische links werden nicht traversed

-> test file existing, read file data, copy file, move file

symbolische links werden traversed

-> traverse a directory-tree

alle metadaten über eine file werden mitkopiert

-> copy file

wenn targetfile existiert wird sie reülaced (ohne den parameter wird eine exception geworfen wenn die file schon existiert)

-> copy file, move file

operation wird atomic ausgeführt, stellt sicher dass jeder prozess nur einen kompletten record sieht. Wenn das feature nicht supported ist im filesystem wird ggfs. eine exception geworfen

-> move file

* toString() : string repräsentation des gesamten Pfads

* getNameCount(): liste von namen im Pfad (happy/hippo/.. )

* getName(int) meist mit der methode oben verwendet, index ist index im pfad 

zero-index, file-system-root ist excluded

getFileName() -> returned neue Pathinstanz mit dem filename

getParent() returned null wenn kein parentpath, Wenn der Path relative ist hört die methode im top-lvl des paths auf, geht nicht zum filesystemroot

getRoot(), wenn relative dann null.

isAbsolute()

toAbsolutePath(), wenn schon absolute bekommt man eine kopie zurück