Savitribai Phule Pune University T.Y.B.B.A.(C.A.) Core Java Practical Slip 27 Answers

 

Slip 27 A) Write a java program to accept a number from user, If it is greater than 1000 then throw user defined exception “Number is out of Range” otherwise display the factors of that number. (Use static keyword)

Answer :

import java.io.*;

class NumOutRange extends Exception{}

class Slip27A{

    static int n;

    public static void main( String args[]){

        DataInputStream dr = new DataInputStream(System.in);

        try {

            System.out.print("Enter Number : ");

            n = Integer.parseInt(dr.readLine());

            if(n>1000){

                throw new NumOutRange();

            }else{

                for(int i=1; i<n; i++){

                    if(n%i==0){

                        System.out.println(i + " ");

                    }

                }

            }

        } catch (NumOutRange nz) {

            System.out.println("Num is out of range..!");

        }

        catch (Exception e){

            System.out.println(""+e.getMessage());

        }

    }

}

Output :

Slip 27 B) Write a java program to accept directory name in TextField and display list of files and subdirectories in List Control from that directory by clicking on Button.

Answer :

import java.awt.*;

import java.awt.event.*;

import java.io.*;

 

public class Slip27B extends Frame implements ActionListener{

    Graphics g;

    List l;

    TextField t1;

    Button b1;

    Label l1;

   

    public Slip27B(){

        this.setLayout(new FlowLayout());

        this.setSize(400,400);

        this.setVisible(true);

        l1 = new Label("Enter Directory ");

        t1 = new TextField(20);

        l = new List(10);

        b1 = new Button("Display");

        l1.setBounds(50,100,80,80);

        t1.setBounds(50,150,80,80);

        b1.setBounds(50,200,80,80);

        l.setBounds(50,300,100,100);

        add(l1);

        add(t1);

        add(b1);

        add(l);

        b1.addActionListener(this);

    }

 

    public void actionPerformed(ActionEvent e){

        if(e.getSource()==b1){

            try{

                String nm = t1.getText();

                File f1 = new File(nm + ":");

                String s1[]=f1.list();

                if(s1==null){

                    System.out.println("Dir not exist");

                }else{

                    for(int i=0; i<s1.length; i++){

                        l.add(s1[i]);

                    }

                }

            }catch(Exception ee){}

        }

    }

    public static void main(String args[]){

        new Slip27B();

    }

}

Output :