OOP IN JAVA(OBJECT CREATION AND DATA TYPES)
Now,
How to creat OBJECT
Object Creation
In Java
The object is a foundation of an OOPs language,and Java, we can't generate any program without creating an object. They are 2 different way to create an object in Java that we will discuss in this section, and also now I explain how to create an object in Java.
java, 4 points to create an object.
- Using class object name
- Using Variable
- Using new Keyword
- Using clone() method.
And Mainly 2 different type to creat object in java
human cl = new Human ();
&
human cl;
cl= new human ();
Note : An object can be generated from java only if there is a class. Only a class can be converted to an object.
2 DATA TYPES
Data Types in Java
Java main data type is a Primitive data types. It Contain 08 types in java , include byte ,char,short,int,long,float, double,boolean these all 08 types again dived 3 ways ,
- Integer - byte/char/short/int/long
- Floating point - float/double
- Binary -boolean
And also integer and Floating contain hierarchy.
Note: If the relevant primitive data type is of the same type, it can be accessed. If the types are different, it cannot be accessed directly.
Ex :
integer a= 2;
long l = 5;
a+l = 7 ✓
Float f= 7.8;
double d= 9;(9.0)
f-d;✓
long c= 346;
float g=345.8;
c+g ( Totally Wrong)
Now I move on explain of above 08 data types.
Data types specify the different sizes min and max values and Range that can be stored in the variable. There are,
Type |
Size |
Min values |
Max value |
Rang |
Default Value |
EX |
Byte |
8 |
-128 |
127 |
+127 to -127 |
0 |
byte b = 34; |
Char |
16 |
0 |
216-1 |
All uni |
*/u0000* |
char c =
“ad34” |
Short |
16 |
-215 |
215-1 |
+32767 to
-32767 |
0 |
short s
=324; |
Int |
32 |
-231 |
231-1 |
A.N. N |
0 |
int i=45678; |
Long |
64 |
-263 |
263-1 |
A.N. N |
0L |
long l =1234; |
Float |
32 |
-2149 |
(2-2).2-23127 |
A.N. N |
0.0 |
float f=
456f |
Double |
64 |
-21074 |
(2-2).2-52 1023 |
A.N. N |
0.0 |
double d=
23.4343 |
Boolean |
1 |
|
|
T/F |
False |
Boolean b = t/f |
A.N.N- All Numeric Numbers
String.
String is a class. It is called perbuild class. It is also used as a data type. It is a primitive data type. Finally, any data can be assed from string. Examples are as follows;
String s= "12456"
String s1="bacde"
String s2= "!@#$%"
String s3="hbi12%&"
Note : The value should be put in the curly bracket
Thank you.
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