Java All-in-One For Dummies Cheat Sheet

Common Java statements

Java statements build programs. Every Java class must have a body, which is made up of one or more statements. You can write different kinds of statements, including declaration and expression.

The break statement

break;

The continue statement

continue;

The do statement

do
    {statements...}
while (expression);

The for statement

for (init; test; count)
    {statements...}

The enhanced for statement

for (type variable : array-or-
    collection)
    {statements...}

The if statement

if (expression)
    {statements...}
else
    {statements...}

The throw statement

throw (exception)

The switch statement

switch (expression)
{
    case constant:
        statements;
        break;
    default:
        statements;
        break;  
}

The while statement

while (expression)
    {statements...}

The try statement

try
    {statements...}
catch (exception-class e)
    {statements...}...
finally
    {statements...}
try
    {statements...}
finally
    {statements...}

Primitive data types

Java data types are the kind of data you can store in a variable. Primitive data types are defined by the language itself. Java defines a total of eight primitive types. Of the eight primitive data types, six are for numbers, one is for characters, and one is for true/false values. Of the six number types, four are types of integers, and two are types of floating-point numbers.

Math and NumberFormat classes

Java classes lay the foundation for your programs. The Java Math and NumberFormat classes let you program number values, as well as format numbers and currencies.

Java operators

An operator designates a mathematical operation or some other type of operation that can be performed on operands. Java has arithmetic operators, relational operators (also known as binary operators) and logical operators (also known as Boolean operators).