Java

/*
Multiline comment
*/

// single line comment
public class Main {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

Variables

Primitive types:

• String - characters
• char - single character
• int - integer
• float - floating point number
• boolean - true or false

// declaration
type variableName = value;

// other possible declarations
type variableName;
variableName = value;

int anInteger = 1;

// multiple declarations
type x, y, z;
x = y = z = value;

int x = 1, y = 2, z = 3;

Keywords:

• final - constant
• static - class variable
• public - accessible from anywhere
• private - accessible only from the class
• protected - accessible from the class and subclasses
• void - no return value

final type variableName = value;

final int CONSTANT = 1;

Data Types

• byte - 1byte numbers: -128 to 127
• short - 2bytes numbers: -32,768 to 32,767

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