Simple Java language programs

Java program has three segments

1. Class declaration
2. pre define method(main method) definition
3. Print statements

Example

Let,s look at  how to save the file, compile and run this program  please follow these steps

• Open the Notepad++ and add the  above code
• Save the file,
• file name My_First_Java_Program.java
• the file name must be the same as the class name

• Open the command prompt
• go to the directory
• fine where you saved the file.

The explanation is given below

• Type ‘ javac My_First_Java_Program.java’ and press enter to compile your code. If there are no error in your code, the commend prompt Will take you to the next line

• Then, type   ‘ java My_First_Java_Program’ to run your program and enter the enter key

• You will be able to see ‘my first java program’ printed on the window

 

my first java program

 

public class Mynewmarks  //class declaration
{
public static void main(String args[]) //main method
{
byte mynewmarks;  //variable declaration
mynewmarks=10;  //value initialization to variable
System.out.print(mynewmarks);// display statement
}
}

When the above code is executed it produces the following result

out put - 10

1 – This program provides a character output

public class alphaphat{
public static void main(String args[]){
char ch='A';
System.out.print(ch);
}
}

 

output - A

2 – This program provides a character output using ASCII value

public class char1{
public static void main(String args[]){
char ch=67;
System.out.print(ch);
}
}

 

output  - c

3

public class doublealphapat{

public static void main(String args[]){

char ch=’67’;  // It is an ascii value, not a charater

System.out.print(ch);

}

}

out put  – error

4 – This program displays octal value

public class octal{
public static void main(String args[]){
char ch=067;
System.out.print(ch);
}
}

out put  – 7

5

public class Display1{

public static void main(String args[]){

char ch=’65535;

System.out.print(ch);

}

}

out put  – ?

6

public class display2{

public static void main(String args[]){

char ch=’u0015′;

System.out.print(ch);

}

}

output  – symbol

7

public class displayChar{

public static void main(String args[]){

char ch=’A’;

System.out.print(ch+1);

}

}

output  – 66

public class concatenate{

public static void main(String args[]){

char ch=’A’;

System.out.print(“my charecter is “+ch+1);

}

}

out put  – my charecter is A1

8
public class alphapat2{
public static void main(String args[]){
char ch=0x67;
System.out.print(ch);
}
}

output  – g

9
public class alphapat3{
public static void main(String args[]){
char ch=’A’;
System.out.print((char)(ch+1));
}
}
output  – B

 

print bio data using Java program

class biodata{
public static void main(String args[]){
String fname;
String lname;
String fullname;
int age;
char bloodgroup;
double salary;
double height;
String game;
char divition;
int grade;

fname="karmehavannan";
lname="sathasivam";
age=20;
bloodgroup='A';
salary=20000;
height=163;
grade=12;
divition='B';
game="football";

System.out.println("my first name is"+" "+fname);
System.out.println("my last name is" +" " +lname);
System.out.println("my full name is" +" " +fname+" "+lname);
System.out.println("my age is"+" "+age);
System.out.println("my salary is"+" "+salary);
System.out.println("my blood group is"+" "+bloodgroup);
System.out.println("my height is"+" "+height);
System.out.println("my fevorite game is"+" "+game);
System.out.println("my Grade is"+" "+grade+divition);

}

}

When the above code is executed , it produces the following result

boolean 

1. public class vanbuolean{
public static void main(String args[]){
boolean bul;
bul =true;
System.out.print(bul);
}
}
out put – true

Funny program

public class face1{
public class doublealphapat{
public static void main(String args[]){
char ch=2;
System.out.print(ch);
}
}

out put  – face

 

Aarethmatic oparation

program 1

class add{
public static void main(String args[]){
int x=10;
double y=3;
System.out.println(x+y);
System.out.println(x-y);
System.out.println(x*y);
System.out.println(x/y);
System.out.println(x%y);
}
}

 

output

13.0
7.0
30.0
3.33333333333335
1.0

program 2

class oper{
public static void main (String arg[]){
int a =3;
int b = 5;
int c = 1;
a= a+b+c;

System.out.println("__________________________");
System.out.println(a);
System.out.println(b);
System.out.println(c);

b+=a;
System.out.println("__________________________");
System.out.println(a);
System.out.println(b);
System.out.println(c);
c=b+++a--+--c;
System.out.println("__________________________");
System.out.println(a);
System.out.println(b);
System.out.println(c);
a=--b+--c+a++;
System.out.println("__________________________");
System.out.println(a);
System.out.println(b);
System.out.println(c);

}
}

When the above code is executed it produces the following result

.................................................
9
5
1
..................................................
9
14
1
....................................................
8
15
23
.....................................................
44
14
22
......................................................

Unary operation

class add1{
public static void main(String args[]){
int x=10;
int y=3;

System.out.println(x+y);
System.out.println(x-y);
System.out.println(x*y);
System.out.println(x/y);
System.out.println(x%y);
System.out.println(x-=1);
System.out.println(x+1);
System.out.println(x-1);
System.out.println(x+=1);
System.out.println(x-=1);
System.out.println(++x);
System.out.println(y);
System.out.println(++y);
System.out.println(y++);
System.out.println(y);
System.out.println(++y);
System.out.println(++y+y);
System.out.println(++y + ++y);
System.out.println(++y + ++y+y++);
}
}

 

When the above code is executed it produces the following result

13
7
30
3
1
9
10
8
10
9
10
3
4
4
5
6
14
17
32