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Chapter 3 : Article 1 : Variables : Integer Type
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01.Integer Variables are used as follows
class ex_integer
{
public static void main(String args[])
{
System.out.println("Integer Demo");
int x;
x=10;
System.out.println("x is "+x);
int y=20;
System.out.println("y is "+y);
int z=x+y;
System.out.println("z is "+z);
int sum;
System.out.println("wrong value of sum "+x+y+z);
sum=x+y+z;
System.out.println("right value of sum "+sum);
}
}
02. Save it as ex_integer.java Compile the above
03. D:\workarea>javac ex_integer.java Run this program
04. D:\workarea>java ex_integer
05. The output will be
x is 10
y is 20
z is 30
wrong value of sum 102030
right value of sum 60
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Chapter 3 : Article 2 : Using of long, double and float types
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Short
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Int
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Float
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Double
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Long
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16 bit type
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32 bit type
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32 bit type
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64 bit type
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64 bit type
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Range from
-32,768 to +32,768
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Range from
-2,147,483,648 to +2,147,483,648
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Range from
3.4e-038 to 3.4e+038
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Range from
1.7e-308 to 1.7e+308
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Range Longer than int
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class ex_double
{
public static void main(String args[])
{
System.out.println("double, long, float Demo");
double x;
x=10.123456;
System.out.println("x is "+x);
long y;
y=300000; //Cannot use decimals in between like 3.5
System.out.println("y is "+y);
float z;
z=12;
System.out.println("z is "+z); //.0 gets added by itself
}
}
01. Save the above file as ex_double.java , run and compile
02. The result of above file is
x is 10.123456
y is 300000
z is 12.0
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Chapter 3 : Article 3 : Usage of character type variables
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class ex_character
{
public static void main(String args[])
{
System.out.println("character Demo");
char x;
x='a';
System.out.println("x is "+x);
char y;
y=65; //Return ASCII equivalent char
System.out.println("y is "+y);
}
}
01. Save the above file as ex_character.java , run and compile
02. The result of above file is
x is a
y is A
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Chapter 3 : Article 4 : Usage of String type variables
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class ex_string
{
public static void main(String args[])
{
System.out.println("String Demo");
String fname;
fname="James";
String lname="Smith";
System.out.println("fname is "+fname);
System.out.println("lname is "+lname);
System.out.println("Full Name is "+fname+" "+lname);
}
}
01. Save the above file as ex_string.java , run and compile
02. The result of above file is
fname is James
lname is Smith
Full Name is James Smith
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Next CHAPTER 4 : >> WORLD OF OOPS
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My Dream to be your Friend and Create a Group of Intelligent and Understanding Programmers
|
 If you like this article and/or code mailme or Join our small Java User Group which is by the Programmers for the Programmers ,
Till we meet next time BYE  Kind Regards - James Smith
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Java, J2EE, J2SE and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc.
in the United States and other countries. 
|
