JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Data Types

Java is a strongly typed language. Part of java's safety and robustness comes from this fact. You can broadly classify java primitive data types as given below:

Integers

Java defines 4 integer types. These include both positive and negative numbers.

Type Size Reference Example
byte 8 bits byte x,y,z;
short 2 bytes short x;
int 4 bytes int num;
long 8 bytes long millise;

Floating point numbers

Floating point numbers are very useful when we are evaluating expressions that require fractional precisions. Java defines 2 types of floating point numbers, they are float, and double.

Type Size Reference Example
float 4 bytes float percentage;
double 8 bytes double distance;

Characters

In java we store characters by using char data type. Size of character is 2 bytes.

Example:

char a='c';

Booleans

In java we use boolean for logical values, it can represent either true or false.

Example:

boolean isNumber=false;

Next Page: Variables

Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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