Java Basics: Java environment, the first Java program, an array of Java

Java environment:

1. What are bytecode and virtual machines?

2. Setting of environment variables

3. Some common Java commands

4. How does the computer run the Java program?

5. Java Garbage collector

6. Basic data types and conversions for Java

Example: The first Java program

An array of Java:

1. One-dimensional arrays

• Declaration of an array
• Array allocation space and initialization
• The length of the array
• Two copies between arrays: System.arraycopy (array1,start,array2,start,length)

2. Two-bit array

• Declaration and initialization of two-dimensional arrays

Java Basics: Java environment, the first Java program, an array of Java