Java Beginner (iii)

First, using the keyboard input data

Three steps: 1, Import Package: Imports Java.util.Scanner;

2. Create keyboard Entry object: Scanner sc=new Scanner (system.in);

3. Get data by object: int X=sc.nextint ();

Second, Java memory allocation

In order to improve the program efficiency, the Java program allocates the data in different space. Arrays do not point to heap memory addresses when an array is assigned NULL

Specifically divided into 5 memory space: 1, stack, storage is a local variable

2, heap, storage is all new out of things

3. Method area,

4, local method area, and system-related

5, register, CPU use

Array plots

Diagram of two array memory address assignments

Diagram of three arrays, where the address of the first array is assigned to the third array

Java Beginner (iii)