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java
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1)To print Hello on console.
class Hello{
public static void main(String args[]){
System.out.println("Hello World!!");}
}
output:-
C:\Users\Desktop\Java Prgs\java HelloHello World!!
2)To print first 20 terms of fibonacci series.package helloworld;import java.io.*;
public class Fibonacci{ public static void main(String[] args) { System.out.println("Representing the Fibonacci series.."); int[] seq=new int[21]; seq[1]=0; seq[2]=1; for(int i=3;i<=20;i++) { seq[i]=seq[i-1]+seq[i-2]; } for(int j=1;j<=20;j++) { System.out.print(seq[j]+" "); }
}}
Output::
Representing the Fibonacci series..0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181
BUILD SUCCESSFUL (total time: 0 seconds)
3)To check the primality of a number.
package helloworld;import java.util.Scanner;
public class Helloworld { public static void main(String[] args)
{ Scanner scan=new Scanner(System.in); System.out.println("Checking for primality of a number..."); System.out.println("Enter the number"); double num=scan.nextDouble(); System.out.println("number= "+num);
int flag=0; double srt=Math.sqrt(num); System.out.println("Sqrt is: "+srt); for(int i=2;i<=srt;i++) { if(num%i!=0) {flag=0; continue; } else{flag=1; break; } }
if(flag==1){ System.out.println("Not a prime number"); } else { System.out.println("It is a prime number"); }
}
output::
run:for primality of a number...Enter the number69number= 69.0Sqrt is: 8.306623862918075Not a prime number
BUILD SUCCESSFUL (total time: 1 second)
4)To print the reverse of the number, the number is taken as input
from the user.import java.util.Scanner;
class Reverse
{
public static void main(String args[])
{
System.out.print("enter the number ::");
Scanner scan=new Scanner(System.in);
int a,i=0;
a=scan.nextInt();
int[] digit=new int[3];
while(a>=10)
{
digit[i]=a%10;
a=a/10;
i++;
}
digit[i]=a;
int s=0;
for(int j=0;j<=i;j++)
s=((s*10)+(digit[j]));
}
System.out.println(s);
}
}
OUTPUT
5)To calculate the occurrences of every digit in a number,the number is taken as an input from the user.
import java.util.Scanner;
class Occurences
{
public static void main(String args[])
{
System.out.print("enter the number ::");
Scanner scan=new Scanner(System.in);
int num;
num=scan.nextInt();
int[] digit=new int[10];
int a;
while(num>=10)
{
a=num%10;
switch(a)
{
case 0:digit[0]=(digit[0]+1);
break;
case 1:digit[1]=(digit[1]+1);
break;
case 2:digit[2]=(digit[2]+1);
break;
case 3:digit[3]=(digit[3]+1);
break;
case 4:digit[4]=(digit[4]+1);
break;
case 5:digit[5]=(digit[5]+1);
break;
case 6:digit[6]=(digit[6]+1);
break;
case 7:digit[7]=(digit[7]+1);
break;
case 8:digit[8]=(digit[8]+1);
break;
case 9:digit[9]=(digit[9]+1);
break;
}
num=num/10;
}
switch(num)
{
case 0:digit[0]=(digit[0]+1);
break;
case 1:digit[1]=(digit[1]+1);
break;
case 2:digit[2]=(digit[2]+1);
break;
case 3:digit[3]=(digit[3]+1);
break;
case 4:digit[4]=(digit[4]+1);
break;
case 5:digit[5]=(digit[5]+1);
break;
case 6:digit[6]=(digit[6]+1);
break;
case 7:digit[7]=(digit[7]+1);
break;
case 8:digit[8]=(digit[8]+1);
break;
case 9:digit[9]=(digit[9]+1);
break;
}
for(int i=0;i<10;i++)
{
System.out.println("digit "+i+" has been repeated "+digit[i]+" times");
}
}
}
OUTPUT
6)To maintain bank account. Extend Bank account details to current
and saving account.importjava.util.Scanner;
class Account
{
Account()
{
Accountno=0;
balance=0;
name=" ";
}
intAccountno;
float balance;
String name;
public void deposit(float dep)
{
balance=(balance+dep);
}
voidgetdata()
{
System.out.println("Your Account number is:"+Accountno);
System.out.println("The name of the account holder is:"+name);
System.out.println("Your balance is:"+balance);
}
}
class Saving extends Account
{
Saving()
{
Accountno=0;
balance=0;
name=" ";
}
Saving(intnum,floatbal,String s)
{
Accountno=num;
balance=bal;
name=s;
}
public voidswithdrawl(float wdraw)
{
if((balance-wdraw)>1000)
{
balance=balance-wdraw;
}
else
{
System.out.println("There is not enough balance in your account to withdraw the given amount");
}
}
}
class Current extends Account
{
Current()
{
Accountno=0;
balance=0;
name=" ";
}
Current(intnum,floatbal,String s)
{
Accountno=num;
balance=bal;
name=s;
}
public void cwithdrawl(float wdraw)
{
if((balance-wdraw)>-10000)
{
balance=balance-wdraw;
}
else
{
System.out.println("There is not enough balance in your account to withdraw the given amount");
}
}
}
class Bank
{
public static void main(String args[])
{
Saving ob1=new Saving();
Current ob2=new Current();
intch,num,choice,p;
floatbal,dep,with;
int c;
do
{
System.out.println("Enter the type of Account:(1 for savings and 2 for current):");
Scanner scan=new Scanner(System.in);
ch=scan.nextInt();
if(ch==1)
{
do
{
System.out.println("Enter your choice:1 for creating a new account,2 for deposit and 3 for
withdrawl:");
c=scan.nextInt();
if(c==1)
{
System.out.println("Enter the Account number:");
num=scan.nextInt();
System.out.println("Enter the name of the Account Holder:");
String str= scan.next();
System.out.println("Enter the Account Balance:");
bal=scan.nextFloat();
ob1=new Saving(num,bal,str);
ob1.getdata();
}
if(c==2)
{
System.out.println("Enter the amount to be deposited:");
dep=scan.nextFloat();
ob1.deposit(dep);
ob1.getdata();
}
if(c==3)
{
System.out.println("Enter the amount to be withdrawn:");
with=scan.nextFloat();
ob1.swithdrawl(with);
ob1.getdata();
}
System.out.println("Do you want to continue:(press 0 for yes and 1 for no):");
choice=scan.nextInt();
}while(choice==0);
}
else
{
do
{
System.out.println("Enter your choice:1 for creating a new account,2 for deposit and 3 for
withdrawl:");
c=scan.nextInt();
if(c==1)
{
System.out.println("Enter the Account number:");
num=scan.nextInt();
System.out.println("Enter the name of the Account Holder:");
String str= scan.next();
System.out.println("Enter the Account Balance:");
bal=scan.nextFloat();
ob2=new Current(num,bal,str);
ob2.getdata();
}
if(c==2)
{
System.out.println("Enter the amount to be deposited:");
dep=scan.nextFloat();
ob2.deposit(dep);
ob2.getdata();
}
if(c==3)
{
System.out.println("Enter the amount to be withdrawn:");
with=scan.nextFloat();
ob2.cwithdrawl(with);
ob2.getdata();
}
System.out.println("Do you want to continue:(press 0 for yes and 1 for no):");
choice=scan.nextInt();
}while(choice==0);
}
System.out.println("Do you want to deal with another account:");
p=scan.nextInt();
} while(p==0);
} }
OUTPUT
7)To maintain Bank Account using packages.package pack;
importjava.util.Scanner;
public class Account
{
public Account()
{
Accountno=0;
balance=0;
name=" ";
}
intAccountno;
float balance;
String name;
public void deposit(float dep)
{
balance=(balance+dep);
}
public void getdata()
{
System.out.println("Your Account number is:"+Accountno);
System.out.println("The name of the account holder is:"+name);
System.out.println("Your balance is:"+balance);
}
}
package pack;
importjava.util.Scanner;
public class Current extends Account
{
public Current()
{
Accountno=0;
balance=0;
name=" ";
}
public Current(intnum,floatbal,String s)
{
Accountno=num;
balance=bal;
name=s;
}
public void cwithdrawl(float wdraw)
{
if((balance-wdraw)>-10000)
{
balance=balance-wdraw;
}
else
{
System.out.println("There is not enough balance in your account to withdraw the given amount”);
}
}
}
package pack;
importjava.util.Scanner;
public class Saving extends Account
{
public Saving()
{
Accountno=0;
balance=0;
name=" ";
}
public Saving(intnum,floatbal,String s)
{
Accountno=num;
balance=bal;
name=s;
}
public voidswithdrawl(float wdraw)
{
if((balance-wdraw)>1000)
{
balance=balance-wdraw;
}
else
{
System.out.println("There is not enough balance in your account to withdraw the given amount");
}
}
}
import pack.*;
importjava.util.*;
class Packages
{
public static void main(String args[])
{
Saving ob1=new Saving();
Current ob2=new Current();
intch,num,choice,p;
floatbal,dep,with;
int c;
do
{
System.out.println("Enter the type of Account:(1 for savings and 2 for current):");
Scanner scan=new Scanner(System.in);
ch=scan.nextInt();
if(ch==1)
{
do
{
System.out.println("Enter your choice:1 for creating a new account,2 for deposit and 3
forwithdrawl:”);
c=scan.nextInt();
if(c==1)
{
System.out.println("Enter the Account number:");
num=scan.nextInt();
System.out.println("Enter the name of the Account Holder:");
String str= scan.next();
System.out.println("Enter the Account Balance:");
bal=scan.nextFloat();
ob1=new Saving(num,bal,str);
ob1.getdata();
}
if(c==2)
{
System.out.println("Enter the amount to be deposited:");
dep=scan.nextFloat();
ob1.deposit(dep);
ob1.getdata();
}
if(c==3)
{
System.out.println("Enter the amount to be withdrawn:");
with=scan.nextFloat();
ob1.swithdrawl(with);
ob1.getdata();
}
System.out.println("Do you want to continue:(press 0 for yes and 1 for no):");
choice=scan.nextInt();
}while(choice==0);
}
else
{
do
{
System.out.println("Enter your choice:1 for creating a new account,2 for deposit and 3
forwithdrawl:”);
c=scan.nextInt();
if(c==1)
{
System.out.println("Enter the Account number:");
num=scan.nextInt();
System.out.println("Enter the name of the Account Holder:");
String str= scan.next();
System.out.println("Enter the Account Balance:");
bal=scan.nextFloat();
ob2=new Current(num,bal,str);
ob2.getdata();
}
if(c==2)
{
System.out.println("Enter the amount to be deposited:");
dep=scan.nextFloat();
ob2.deposit(dep);
ob2.getdata();
}
if(c==3)
{
System.out.println("Enter the amount to be withdrawn:");
with=scan.nextFloat();
ob2.cwithdrawl(with);
ob2.getdata();
}
System.out.println("Do you want to continue:(press 0 for yes and 1 for no):");
choice=scan.nextInt();
}while(choice==0);
}
System.out.println("Do you want to deal with another account:");
p=scan.nextInt();
} while(p==0);
}
}
OUTPUT
8)To create a main thread and perform operations on it.
classMythread{
public static void main(String args[]){
Thread t=Thread.currentThread();System.out.println("Current thread: "+t);try{
for(int i=1;i<=5;i++){
System.out.println(i);Thread.sleep(1000);
}}catch(InterruptedException e){System.out.println("Main thread Interrupted");}
}}
output:-
C:\Users\Desktop\java prgs>java Mythread
Current thread: Thread[main,5,main]12345
C:\Users\Desktop\java prgs>
