Java series Learning (6)-array and java series learning Array

Java series Learning (6)-array and java series learning Array

1. Method:

(1) Definition:

   
Code that completes a specific functional block, also called a function in some languages
 

(2) format:

(3) method Overloading

[In the same class, the method name is the same, the parameter list is different, and it is irrelevant to the return value]

2. Array

(1) Definition

   
Containers that store multiple elements of the same data type
 

(2) features:

   
Each element has a number starting from 0. The maximum number is: array length-1;
    
The professional name of the number: Index
 

(3) format:

   
A: Data Type [] array name (recommended)
    
B: data type array name []
 

(4) array initialization:

   
A: Dynamic Initialization
    
[Only the length and coefficient are given with the default value]
    
B: static Initialization
    
[Given value, the system determines the length]
    
C: it cannot be performed dynamically or statically at the same time. An error is reported.
    
 

(5) Java Memory Allocation

   
A: Stack, storage value type, or reference address. Data disappears after use.
    
B: Heap. It stores all new objects.
    
[Every variable in the heap has a default value
    
Byte, short, int, long: 0
    
Float, double: 0.0
    
Char: '\ u0000'
    
Boolean: false
    
Reference Type: null]
    
C: Method Area, storing local variables in brackets
    
D: local method area, related to the system
    
E: registers, CPU usage
 

(6) Common Operations on Arrays

   
A: array Traversal
    
B: obtain the maximum/small value from the array.
    
C: array element reverse order
    
D: array lookup Method
    
E: array sorting and Binary Search
 

3. Two-dimensional array

(1) Definition:

   
The element is an array of one-dimensional arrays.
 

(2) format:

(3) case:

   
A: traversal of two-dimensional arrays
    
    
B: summation of two-dimensional arrays
    
    
C: Yang Hui triangle
    
 

(4) schematic diagram