"Здравей, Амиго! Стана малко омекнал! Ето упражненията ти. Ако срещнеш затруднения, консултирай се с колегите си. Те определено ще помогнат."
„Вече направихте всичко? Е, ето някои упражнения, които са още по-трудни:“
6
Задача
Java Core, ниво, урок
Minimum changes
With minimum code changes, make it possible to serialize the C class.
12
Задача
Java Core, ниво, урок
Deserialization
Serialized A or B objects are written to the stream that is passed in.
Deserialize the object in the getOriginalObject method. If an exception occurs, display a message and return null.
Implement the Serializable interface where necessary.
20
Задача
Java Core, ниво, урок
Find the bugs
For some reason, errors are occurring when serializing/deserializing B objects.
Find the problem and fix it.
The A class should not implement the Serializable and Externalizable interfaces.
There is no error in the B class's signature :).
There are no errors in the main method.
6
Задача
Java Core, ниво, урок
Correct the mistake. Serialization
After deserializing a Solution object, map m was discovered to have no data :(
Fix 1 bug.
6
Задача
Java Core, ниво, урок
Serializing people
Serialize the Person class in the standard way. Add the transient modifier to some fields, if necessary.
6
Задача
Java Core, ниво, урок
Serialization is prohibited
Block serialization of the SubSolution class using the NotSerializableException.
Don't change the method signatures.
20
Задача
Java Core, ниво, урок
Overriding serialization in a thread
Serializing/deserializing the Solution class doesn't work.
Fix the bugs without changing method or class signatures.
The main method is not tested.
Write the verification code yourself in the main method:
1) create an instance of the Solution class
2) write data to it (writeObject)
3) serialize the
12
Задача
Java Core, ниво, урок
Making the right conclusion
Arrange calls to the superclass's methods and access modifiers to achieve the following screen output:
C class, method2
A class, method2
A class, method1
B class, method1
1. Only one of the superclass's methods can be called from each method.
2. Only one of the class's methods can be called from e
12
Задача
Java Core, ниво, урок
Introducing graphs
Read the additional materials on serialization of graphs.
The Solution class has a directed planar graph containing cycles and loops.
For example, http://edu.nstu.ru/courses/saod/images/graph1.gif
Serialize Solution.
The direction of all of the edges must remain the same.
20
Задача
Java Core, ниво, урок
Number algorithms
Suppose the number S consists of M digits. For example, if S = 370, then M (the number of digits) = 3
Implement the getNumbers method. Among natural numbers less than N (long), it should
find all the numbers satisfying the following criterion:
The number S is equal to the sum of its digits raised in the Mth
12
Задача
Java Core, ниво, урок
Rectangle algorithms
1. Here we have a two-dimensional N*N array that contains several rectangles.
2. The various rectangles do not touch or overlap.
3. The interior of each rectangle is filled with 1s.
4. The array values have the following meaning:
4.1) a[i, j] = 1 if element (i, j) belongs to a rectangle
4.2) a[i, j]
20
Задача
Java Core, ниво, урок
Word search
1. We have a two-dimensional array that contains lowercase letters.
2. The detectAllWords method must find all the words in the wordSearch array.
3. The element(startX, startY) must correspond to the first letter of the word, while the element(endX, endY) corresponds to the last letter.
text is the