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UNIT 1: Primitive Types
This unit covers the basic data types in Java, such as
int, double, boolean, and char. It also includes understanding variables, assignment statements, and arithmetic operations.Code Examples:
- Variable Declaration and Initialization:
- Arithmetic Operations:
- Increment and Decrement:
- Type Casting:
- Combining Operations:
- Math Class Usage:
- Character Operations:
- Boolean Logic:
- Simple Output:
- Simple Input (Using Scanner):
UNIT 2: Using Objects
This unit introduces object-oriented programming concepts, focusing on object creation, method calls, and the
String class in Java.Code Examples:
- String Concatenation:
- String Methods:
- Creating Objects:
- Using
Scannerfor Input:
- Using
MathClass:
- Date and Time (Using
LocalDate):
- Random Numbers (Using
Random):
- Formatting Strings (Using
String.format):
- StringBuilder for Efficient String Manipulation:
- Parsing Strings to Primitives:
UNIT 3: Boolean Expressions and if Statements
This unit covers the use of boolean expressions and conditional statements in Java.
Code Examples:
- Simple If Statement:
- If-Else Statement:
- If-Else-If Ladder:
- Nested If Statements:
- Boolean Logical Operators:
- Switch Statement:
- Ternary Operator:
- Comparing Strings:
- Boolean Variable:
- Complex Conditions:
UNIT 4: Iteration
This unit focuses on loops and iteration, including
for, while, and do-while loops.Code Examples:
- Simple For Loop:
- Enhanced For Loop:
- While Loop:
- Do-While Loop:
- Nested Loops:
- Loop Control - Break:
- Loop Control - Continue:
- Infinite Loop:
- Countdown Loop:
- Summing Values in a Loop:
UNIT 5: Writing Classes
This unit introduces the concept of designing and implementing classes in Java, including constructors, methods, and fields.
Code Examples:
- Defining a Simple Class:
- Creating and Using an Object:
- Adding Methods to a Class:
- Using the
thisKeyword:
- Overloading Constructors:
- Encapsulation with Getters and Setters:
- Static Methods and Fields:
- Method Overloading:
- Inheritance Basics (Extending a Class):
Unit 6 Array
Arrays are data structures that store a fixed-size sequential collection of elements of the same type. They are used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
Key Concepts:
- Declaration, instantiation, and initialization of arrays.
- Accessing elements, iterating through arrays.
- Limitations and characteristics of arrays (fixed size, same data type).
UNIT 7: ArrayList
ArrayList in Java is a resizable array, which can be found in the
java.util package. Unlike traditional arrays, ArrayLists can change size dynamically.Key Concepts:
- Creating and using ArrayLists.
- Adding, removing, and accessing elements.
- Comparing ArrayLists with standard arrays.
Example Code:
UNIT 8: 2D Array
2D arrays are arrays of arrays, often used to represent matrices or grids. They are particularly useful for programs that require a lot of data organization, such as games or simulations.
Key Concepts:
- Declaration, instantiation, and initialization of 2D arrays.
- Accessing and modifying elements.
- Nested loops for iteration.
Example Code:
UNIT 9: Inheritance
Inheritance is a fundamental concept in object-oriented programming that allows a new class to inherit properties and methods from an existing class. This promotes code reuse and establishes a hierarchical relationship between classes.
Key Concepts:
- Understanding base (superclass) and derived (subclass) classes.
- Overriding methods.
superkeyword for accessing superclass methods and constructors.
- Polymorphism and dynamic method dispatch.
Example Code:
UNIT 10: Recursion
Recursion is a programming technique where a method calls itself to solve a problem. It's a powerful tool, especially for tasks that can be defined in terms of similar subtasks.
Key Concepts:
- Understanding recursive methods.
- Base case and recursive case.
- Stack overflow and termination conditions.
- Recursive algorithms (e.g., factorial, Fibonacci).
Example Code:
- 作者:现代数学启蒙
- 链接:https://www.math1234567.com/article/csareview
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