CSA Test- Intro, Data Types, Using Objects, Decisions

char

2 bytes - primitive that stores one character - uses single quotes

boolean

1 bit- primitive that stores either true or false

byte

1 byte- holds 8 bits of memory and stores integer values from -128 to 127

short

2 bytes - holds 16 bits of memory and stores integer values from -32768 to 32767

int

4 bytes - holds 32 bits of memory and stores integer values from -2billion to +2billion

long

8 bytes - holds 64 bits of memory and stores integer values from -10,000000000000000000 to 10,000000000000000000

float

4 bytes- holds 32 bits of memory and stores decimal values with up to 6 or 7 digits

double

8 bytes - holds 64 bits of memory and stores decimal values up to 15-16 decimal places

variable declaration

dataType variableName = value;

constant declaration

final dataType variableName = value;

Casting

(new dataType) value

Object Construction

ClassName objectName = new ClassName(parameters);

Method Call (static)

ClassName.methodName(parameters);

Method Call (Instance)

objectName.methodName(parameters);

Importing a Class

import java.something;

if statement

if (condition)

statement;

else

statement;

if-else-if statement

if (condition)

statement;

else if (condition)

statement;

.

.

.

else

statement;

if else statement

if (condition)

statement;

else if (condition)

statement;

switch statement

switch (expression) {

case value1:

statement;

break;

case value2:

statement;

break;

case value3:

statement;

break;

.

.

.

default:

statement;

break;