1.Write a Program to print all Prime numbers in an array of ‘n’ elements.
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import java.util.Scanner;
public class PrimeNumbers{
public static void main (String[] args){
int[] array = new int [5];
Scanner in = new Scanner (System.in);
System.out.println("Enter the elements of the array: ");
for(int i=0; i<5; i++)
{
array[i] = in.nextInt();
}
Elements in the array are looped one by one using for loop.
for(int i=0; i<array.length; i++){
boolean isPrime = true;
Using for loop and if condition, prime numbers are identified from all the numbers that are entered in the array.
for (int j=2; j<i; j++){
if(i%j==0){
isPrime = false;
break;
}
}
All the prime numbers or the numbers that satisfy the if condition are displayed as output.
if(isPrime)
System.out.println(i + " are the prime numbers in the array ");
}
}
}
2.Define an abstract class Staff with protected members id and name. Define a parameterized
constructor. Define one subclass OfficeStaff with member department. Create n objects of
OfficeStaff and display all details.
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import java.io.IOException;
import java.io.InputStreamReader;
abstract class Staff{
String name,address;
}
class FullTimeStaff extends Staff{
String department;
double salary;
public void accept() throws IOException{
System.out.println("Enter the name, address, department and salary: ");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
name=br.readLine();
address=br.readLine();
department=br.readLine();
salary=Double.parseDouble(br.readLine());
}
public void display(){
System.out.println("Name: "+name);
System.out.println("Address: "+address);
System.out.println("Department: "+department);
System.out.println("Salary: "+salary);
System.out.println("----------------------");
}
}
class PartTimeStaff extends Staff{
int hours, rate;
public void accept() throws IOException{
System.out.println("Enter the name, address, No of working hours and rate per hour: ");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
name=br.readLine();
address=br.readLine();
hours=Integer.parseInt(br.readLine());
rate=Integer.parseInt(br.readLine());
}
public void display(){
System.out.println("Name: "+name);
System.out.println("Address: "+address);
System.out.println("No of Working Hours: "+hours);
System.out.println("Rate per hour: "+rate);
System.out.println("----------------------");
}
}
public class sb1 {
public static void main(String [] args) throws IOException{
int i;
System.out.println("Select Any One: ");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("1.Full Time Staff");
System.out.println("2.Part Time Satff");
int ch=Integer.parseInt(br.readLine());
switch(ch){
case 1:
System.out.println("Enter the number of Full Time Staff: ");
int n=Integer.parseInt(br.readLine());
FullTimeStaff [] l=new FullTimeStaff[n];
for(i=0;i<n;i++){
l[i]=new FullTimeStaff();
l[i].accept();
}
for(i=0;i<n;i++){
l[i].display();
}
break;
case 2:
System.out.println("Enter the number of Part Time Staff: ");
int m=Integer.parseInt(br.readLine());
PartTimeStaff [] h=new PartTimeStaff[m];
for(i=0;i<m;i++){
h[i]=new PartTimeStaff();
h[i].accept();
}
for(i=0;i<m;i++){
h[i].display();
}
break;
}
}
}
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