Java Variables

Example Application: Variables

String

String stringVal = "value";

String Array

String[] stringArrayVal = new String[] { "value 1", "value 2"};

Char

char charVal;
charVal = 'A';
charVal = '\u0001';

Char Array

char[] charArrayVal = new char[] { 'A', 'B', 'C', '\u0001' };

Integer

int intVal = 1;

Integer Array

int[] intArrayVal = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, Integer.MIN_VALUE, Integer.MAX_VALUE };

Boolean

boolean boolVal;
boolVal = true;
boolVal = false;

Long

long longVal;
longVal = (long) 10;
longVal = 10L;

Long Array

long[] longArrayVal = new long[] { 1L, 20L, Long.MIN_VALUE, Long.MAX_VALUE };

Byte

byte byteVal;
byteVal = 1;
byteVal = 0x10;

Byte Array

byte[] byteArrayVal = new byte[] { 0x10, 0x12, Byte.MIN_VALUE, Byte.MAX_VALUE };

Float

float floatVal;
floatVal = (float) 1.2;
floatVal = 1.2F;

Float Array

float[] floatArrayVal = new float[] { 1F, 1.2F, 4F, Float.MIN_VALUE, Float.MAX_VALUE };

Double

double doubleVal;
doubleVal = 1.5;

Double Array

double[] doubleArrayVal = new double[] { 1.2, 3, 3.2, Double.MIN_VALUE, Double.MAX_VALUE };

Short

short shortVal;
shortVal = 1;

Short Array

short[] shortArrayVal = new short[] { 1, 2, 3, 400, Short.MIN_VALUE, Short.MAX_VALUE };

Model Class | Custom Class

Model Person

Person p = new Person();
p.setName("Name");
p.setAge(30);
Person person = new Person("Person", 20);
Person[] persons = new Person[] { (new Person("Person 1", 20)), (new Person("Person 2", 22)) };

Model Class Array | Custom Class

Person[] persons = new Person[] { (new Person("Person 1", 20)), (new Person("Person 2", 22)) };

Java String Format Specifiers

Format Specifier	Data Type	...
%a	floating point (except BigDecimal)
%b	Any type
%c	character
%d	integer (incl. byte, short, int, long, bigint)	usually used for int
%e	floating point
%f	floating point	usually used for float or double
%g	floating point
%h	any type
%n	none
%o	integer (incl. byte, short, int, long, bigint)
%s	any type	usually used for string
%t	Date/Time (incl. long, Calendar, Date and TemporalAccessor)
%x	integer (incl. byte, short, int, long, bigint)

Some links for more in depth learning

• JAVA PRINT;
• JAVA SWITCH CASE;
• JAVA IF/ELSE;
• JAVA ARITHMETIC;