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Dictionary keys are unique, so if we add a key value item whose key is the same as an existing key, the effect is to replace that key s value with a new value Brackets are used to access individual values for example, d["root"] returns 18, d[21] returns the string "venus", and d[91] causes a KeyError exception to be raised, given the dictionary shown in Figure 35 Brackets can also be used to add and delete dictionary items To add an item we use the = operator, for example, d["X"] = 59 And to delete an item we use the del statement for example, del d["mars"] will delete the item whose key is mars from the dictionary, or raise a KeyError exception if no item has that

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class Test extends Point { void printBoth() { Systemoutprintln(x + " " + superx); } public static void main(String[] args) { Test sample = new Test(); sampleprintBoth(); Systemoutprintln(samplex + " " + ((Point)sample)x); } }

'mars' (4, 11) 18 0 -14 None 45 'blue' [75, 'R', 2] 'rover'

To begin using LDAPPreferences2 instead of LDAPPreferences1, we must do two things: Add a de nition of the new attribute to the directory schema Change one line in Teexmain to use LDAPPreferences2 We can use teexschema2ldif to add the new attribute and modify the teexPreferences object class de nition The old object class de nition is deleted, and then a new one is added that allows teexPreferencesObject in addition to the other Teex attributes We accomplish all this in a single modify operation in the LDIF le:

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class Test extends SuperTest implements Frob { public static void main(String[] args) { new Test()printV(); } void printV() { Systemoutprintln(v); } }

21 'venus'

interface Frob { float v = 20f; } class SuperTest { int v = 3; }

LDAPPreferences2:

'root' 18

It compiles and prints:

prefs = new LDAPPreferences2( url, uid, password );

key Items can also be removed (and returned) from the dictionary using the dictpop() method Dictionaries support the built-in len() function, and for their keys, fast membership testing with in and not in All the dictionary methods are listed in Table 33 Because dictionaries have both keys and values, we might want to iterate over a dictionary by (key, value) items, by values, or by keys For example, here are two equivalent approaches to iterating by (key, value) pairs:

Even if two distinct inherited elds have the same type, the same value, and are both final, any reference to either eld by simple name is considered ambiguous and results in a compile-time error In the example:

for item in ditems(): print(item[0], item[1]) for key, value in ditems(): print(key, value)

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interface Color { int RED=0, GREEN=1, BLUE=2; } interface TrafficLight { int RED=0, YELLOW=1, GREEN=2; } class Test implements Color, TrafficLight { public static void main(String[] args) { Systemoutprintln(GREEN); // compile-time error Systemoutprintln(RED); // compile-time error } }

You can then compile Teexjava and run it from the command line, just as before There is no visible difference in the behavior, but after changing preferences there is a new binary attribute in the user entry:

Iterating over a dictionary s values is very similar:

it is not astonishing that the reference to GREEN should be considered ambiguous, because class Test inherits two different declarations for GREEN with different values The point of this example is that the reference to RED is also considered ambiguous, because two distinct declarations are inherited The fact that the two

dn: uid=dakers, ou=People, o=airiuscom teexPreferencesObject:: rO0ABXNyABNqYXZhLnV0aWwuSGFzaHRhYmxlE7sPJSFK5LgDAAJGA Apsb2FkRmFjdG9ySQAJdGhyZXNob2xkeHA/QAAAAAAAS3cIAAAAZQAAAAR0AAt0ZWV4dGFic2l6Z

for value in dvalues(): print(value)

class Test extends SuperTest implements Frob { public static void main(String[] args) { new Test()printV(); } void printV() { Systemoutprintln((superv + Frobv)/2); } }

XVyAAJbQqzzF/gGCFTgAgAAeHAAAAABNHQADnRlZXhiYWNrZ3JvdW5kdXEAfgADAAAABC0yMDV0A h0ZWV4Zm9udHVxAH4AAwAAAAdjb3VyaWVydAAJdGVleGNvbG9ydXEAfgADAAAABGJsdWV4

To iterate over a dictionary s keys we can use dictkeys(), or we can simply treat the dictionary as an iterable that iterates over its keys, as these two equivalent code snippets illustrate:

the class Test inherits two elds named v, one from its superclass SuperTest and one from its superinterface Frob This in itself is permitted, but a compile-time error occurs because of the use of the simple name v in method printV: it cannot be determined which v is intended The following variation uses the eld access expression superv to refer to the eld named v declared in class SuperTest and uses the quali ed name Frobv to refer to the eld named v declared in interface Frob:

for key in d: print(key) for key in dkeys(): print(key)

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