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Example : A simple Java program to display message .
class Message
{
public static void main(String[] args)
//public static void main(String []args)
//public static void main(String args[])
//public static void main(String...args)
//static public void main(String[] args)
//public static final void main(String[] args)
//final public static void main(String[] args)
{
System.out.println("Welcome U All in Codershelpline");
}
}
Output :
Welcome U All in CodershelplineExample : A simple Java addition program to display the output of given static or constant values .
class Simple
{
public static void main(String[] args)
{
int x,y,z,c;
x=50;y=60;z=15;
c=x+y+z;
System.out.println(c); // System.out.println(x + y + z);
}
}
//------------- OR ----------------
class Simple
{
public static void main(String[] args)
{
int x = 50, y = 60, z = 15,c;
c=x+y+z;
System.out.println(c); // System.out.println(x + y + z);
}
}
//------------- OR ----------------
class Simple
{
public static void main(String[] args)
{
int x = 50;
int y = 60;
int z = 15;
int c;
c=x+y+z;
System.out.println(c); // System.out.println(x + y + z);
}
}
//------------- OR ----------------
class Message
{
public static void main(String[] args)
{
float f1=720.00000f;
float f2=302.00000f;
float sum=f1+f2;
System.out.println("The addition result are ");
System.out.println(sum);
System.out.println(f1+f2);
System.out.printf("%.3f", sum);
}
}
Output :
The addition result are
1022.0
1022.0
1022.000
//------------- OR ----------------
class Message
{
public static void main(String[] args)
{
float c = (1.1345 + 2.2765) ; // Error generated.
float c = (float) (1.1345 + 2.2765) ;
System.out.println("The addition result are : ");
System.out.printf("%.3f", c);
}
}
Output :
The addition result are :
3.411Example : A simple Java program to calculate given constant float values.
class Message
{
public static void main(String[] args)
{
float f1=720.00000f;
float f2=302.00000f;
float sum=f1+f2;
System.out.println("The addition result are ");
System.out.println(sum);
System.out.println(f1+f2);
System.out.printf("%.3f", sum);
}
}
Output :
The addition result are
1022.0
1022.0
1022.000
//------------- OR ----------------
class Message
{
public static void main(String[] args)
{
// float c = (1.1345 + 2.2765) ; Incorrect format & hence Error will generated.
float c = (float) (1.1345 + 2.2765) ; //correct format
System.out.println("The addition result are =");
System.out.printf("%.3f", c);
}
}
Output :
The addition result are =
3.411Example : A simple Java program to calculate given dynamic values.
import java.io.*;
import java.util.*;
class Datainput
{
public static void main(String[]args)
{
Scanner Sc=new Scanner(System.in);
int a,b,c;
float d;
System.out.println("Enter First no.");
a=Sc.nextInt();
System.out.println("Enter Second no.");
b=Sc.nextInt();
System.out.println("Enter Third no.");
c=Sc.nextInt();
d=(a+b+c)/3;
System.out.println(d); //output format = 30.0
System.out.println();
d=(float)(a+b+c)/3;
System.out.println(d); //output format = 30.1420
}
}Example : A Java program to find ASCII value of a given character .
import java.io.*;
class Simple
{
public static void main(String[] args)
{
char ch1 = 'M';
char ch2 = '*';
System.out.println("ASCII value of "+ch1+" is: " + (int)ch1);
System.out.println("ASCII value of "+ch2+" is: " + (int)ch2);
}
}
Output :
ASCII value of M is: 77
ASCII value of * is: 42Example : A Java program to find ASCII Character from a given ASCII Value .
import java.io.*;
class Simple
{
public static void main(String[] args)
{
int x = 65;
int y = 90;
System.out.println("ASCII character of "+x+" is: " + (char)x);
System.out.println("ASCII character of "+y+" is: " + (char)y);
}
}
Output:
ASCII character of 65 is: A
ASCII character of 90 is: ZExample : A Java program to find Largest/Smallest value between two values along with the square root value.
import java.io.*;
class Example
{
public static void main(String[] args)
{
System.out.println(Math.max(37,15));
System.out.println(Math.min(37,15));
System.out.println(Math.sqrt(625));
}
}
Output :
37
15
25
//------------- OR ----------------
import java.util.Scanner;
class Simple
{
public static void main(String[] args)
{
int num1,num2;
Scanner sc= new Scanner(System.in);
System.out.println("Enter two integer values");
num1=sc.nextInt();
num2=sc.nextInt();
System.out.println("The output are ");
System.out.println(Math.max(num1,num2));
System.out.println(Math.min(num1,num2));
System.out.println();
System.out.println(Math.sqrt(num1));
System.out.println(Math.sqrt(num2));
}
}
Output :
Enter two integer values
625
121
The output are
625
121
25.0
11.0Example : A Java program to read/accept values from the user at run time through keyboard of different types using Scanner class and display all the data.
import java.io.*;
import java.util.*; //import java.util.Scanner;
class Datatype
{
public static void main(String args[])
{
int num;
long val;
float amt;
double total;
char ch;
String str;
Scanner sc= new Scanner(System.in);
System.out.println("Enter an Integer Value");
num=sc.nextInt();
System.out.println("Enter a large integer Value");
val=sc.nextLong();
System.out.println("Enter a Float Value");
amt=sc.nextFloat();
System.out.println("Enter a Double Value");
total=sc.nextDouble();
System.out.println("Enter a Single Character Value");
ch=sc.next().charAt(0);
System.out.println("Enter a String Value");
str=sc.next();
//str=sc.nextLine();
System.out.println();
System.out.println("The output of various datatypes are");
//System.out.println(num);
//System.out.println(val);
//System.out.println(amt);
//System.out.println(total);
//System.out.println(ch);
//System.out.println(str);
System.out.println("Integer value is : " + num + "\n" + "Long value is : " +
val + "\n" + "Float value is : " + amt + "\n" +"Double value is : "+total
+"\n"+"Single Character is : "+ ch +"\n"+"String value is : "+str);
}
}Example : A Java program to read/accept values from the user at run time through keyboard of different types using DataInputStream class and display all the data.
import java.io.*;
class Datainput
{
public static void main(String[] args)throws Exception
{
int num;
long lg;
float val;
double dbl;
char ch;
String str;
DataInputStream dis=new DataInputStream(System.in);
System.out.println("Enter Integer value:");
num=Integer.parseInt(dis.readLine());
System.out.println(num);
System.out.println("Enter Long value:");
lg=Long.valueOf(dis.readLine()).longValue();
System.out.println(lg);
System.out.println("Enter Float value:");
val=Float.valueOf(dis.readLine()).floatValue();
System.out.println(val);
System.out.println("Enter Double value:");
dbl=Double.valueOf(dis.readLine()).doubleValue();
System.out.println(dbl);
System.out.println("Enter CharacterString value:");
ch=(char)dis.read();
//ch=dis.readLine().charAt(0);
System.out.println(ch);
System.out.println("Enter String value:");
str=dis.readLine();
System.out.println(str);
}
} Example : A Java program to read/accept values from the user at run time through keyboard of different types using Buffered Reader class and display all the data.
import java.io.*;
class Buffer
{
public static void main(String[] args)throws Exception
{
int num;
long lg;
float val;
double dbl;
char ch;
String str;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter Integer value:");
num=Integer.parseInt(br.readLine());
System.out.println(num);
System.out.println("Enter Long value:");
lg=Long.valueOf(br.readLine()).longValue();
System.out.println(lg);
System.out.println("Enter Float value:");
val=Float.valueOf(br.readLine()).floatValue();
System.out.println(val);
System.out.println("Enter Double value:");
dbl=Double.valueOf(br.readLine()).doubleValue();
System.out.println(dbl);
System.out.println("Enter Character value:");
ch=(char)br.read();
//ch=br.readLine().charAt(0);
System.out.println(ch);
System.out.println("Enter String value:");
str=br.readLine();
System.out.println(str);
}
}Example : A Java program to read/accept values from the user at run time through keyboard using command line arguments and display all the data.
import java.io.*;
class Simple
{
public static void main(String args[])
{
String g1=args[0];
String g2=args[1];
//int num1=Integer.parseInt(g1);
//int num2=Integer.parseInt(g2);
//Long num1=Long.parseLong(args[0]);
//Long num2=Long.parseLong(args[1]);
//Float num1=Float.parseFloat(args[0]);
//Float num2=Float.parseFloat(args[1]);
//Double num1=Double.parseDouble(args[0]);
//Double num2=Double.parseDouble(args[1]);
System.out.println(num1+num2);
}
}
Output :
E:\>javac Simple.java
E:\>java Simple 20 25
45
E:\>
NB :
Here input is given exactly at interpreted time after compilation with space i.e.java Cmdinput 20 25 and then press enter that gives the result 70.Example : A Java program to read/accept values from the user at run time through keyboard using console method and display all the data.
import java.io.*;
class Console
{
public static void main(String args[])
{
String name=System.console().readLine();
System.out.println(name);
}
}
/* -------------------- OR ---------------------*/
import java.io.*;
class Console
{
public static void main(String args[])
{
Console con=System.console();
System.out.println("Enter your string: ");
String str=con.readLine();
System.out.println(str);
}
}Example : A Java program to calculate simple interest of given values.
import java.io.*;
import java.util.Scanner;
class Simple
{
public static void main(String args[])
{
float p, r, t, si;
Scanner Sc = new Scanner(System.in);
System.out.print("Enter Principal value : ");
p = Sc.nextFloat();
System.out.print("Enter rate value : ");
r = Sc.nextFloat();
System.out.print("Enter time value : ");
t = Sc.nextFloat();
Sc.close();
si = (p * r * t) / 100;
System.out.print("Simple Interest is: " +si);
}
} 
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