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Questions and Answers
What is the purpose of the class constructor?
To initialize objects of the class.
Which of the following are access modifiers in Java? (Select all that apply)
What is the syntax for declaring an array in Java?
DataType[] variableName;
How are arrays in Java allocated?
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What is the first step in obtaining an array in Java?
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What is the syntax for a while loop in Java?
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What is the difference between a 'do while' loop and a 'while' loop?
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What is the syntax for a for loop in Java?
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How do you declare a two-dimensional array in Java?
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Study Notes
Arrays in Java
- Arrays are dynamically allocated.
- Array size can be determined by user input.
- Array creation is two-step process: declaration and instantiation.
- Declaration examples:
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int myArr[ ];orint[ ] myArr; -
int multiArr[ ][ ];orint [ ][ ] multiArr;
-
- Instantiation examples:
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myArr = new int[4]; -
multiArr = new int[4][4];
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Loops in Java
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While loop
- Loops until the given condition is true.
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while (x_IsTrue)-
// do these steps
-
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Do-while loop
- Executes the loop at least once, even if the initial condition is false.
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do-
// do these steps -
while (x_IsTrue)
-
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For loop
- Used when the number of iterations is known.
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for(int i=0; i < size; i++)
Main OOP Vocabulary
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Class
- Blueprint for creating objects.
- Defines data (attributes) and behavior (methods) of objects.
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Object
- Instance of a class.
- Represents a real-world entity with unique state and behavior.
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Encapsulation
- Bundling data and methods within a class, keeping implementation details hidden.
- Achieved through access modifiers.
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Access Modifiers
- Control the visibility and accessibility of class members.
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Public
- Accessible from anywhere.
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Protected
- Accessible within the same package or subclasses.
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Default (package private)
- Accessible within the same package.
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Private
- Accessible only within the class.
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Static (field and method)
- Belongs to the class, not individual objects.
- Shared by all instances of the class.
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Final field
- Cannot be modified after initialization.
Decision Making in Java
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if-else
- Executes a specific block of code based on a condition.
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switch
- Provides a concise way to handle multiple conditions.
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break
- Exits a loop or switch statement.
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continue
- Skips the current iteration of a loop and proceeds to the next iteration.
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Description
Test your knowledge on arrays, loops, and object-oriented programming concepts in Java. This quiz covers dynamic array allocation, loop structures, and basic OOP vocabulary. Challenge yourself to see how well you understand these fundamental programming concepts!
