Program 20: //Design an Applet program to handle Mouse Events. import java.awt.*; import java.applet.*; import java.awt.event.*;

Transcription

1 Program 20: //Design an Applet program to handle Mouse Events. import java.awt.*; import java.applet.*; import java.awt.event.*; /*<applet code="mouseeventdemo" width=400 height=300> </applet>*/ public class MouseEventDemo extends Applet implements MouseListener,MouseMotionListener String msg=""; public void init() setfont(new Font("Arial",Font.BOLD,18)); addmouselistener(this); addmousemotionlistener(this); public void mouseclicked(mouseevent e) msg="mouse Clicked"; repaint(); public void mouseentered(mouseevent e) msg="mouse Entered"; repaint(); public void mouseexited(mouseevent e) msg="mouse Exited"; repaint();

2 public void mousepressed(mouseevent e) msg="mouse Pressed"; repaint(); public void mousereleased(mouseevent e) msg="mouse Released"; repaint(); public void mousedragged(mouseevent e) msg="mouse Dragged"; repaint(); public void mousemoved(mouseevent e) msg="mouse Moved"; repaint(); public void paint(graphics g) g.drawstring(msg,120,150);

3 OUTPUT:

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5 Program 21: //Implement stack using Vector import java.util.*; class VectorQuestion public static void main(string args[]) Vector <Integer> v = new Vector <Integer>(10); Scanner sc = new Scanner (System.in); int ch; do System.out.println("press 1:push"); System.out.println("press 2:pop"); System.out.println("press 3: show stack elements"); System.out.println("press 4: exit"); System.out.println("Enter your Choice ="); ch = sc.nextint(); switch(ch)

6 case 1: int n; System.out.println("Enter the element you want to add = "); n= sc.nextint(); v.addelement(n); break; case 2: try v.remove(v.size()-1); System.out.println("Element is deleted"); catch(emptystackexception e) System.out.println("empty stack"); break; case 3: int x = v.size()-1; if(x== -1) System.out.println("Stack is empty"); System.out.println("Stack elements = "); while(x>=0) System.out.println(v.elementAt(x--)); break; case 4: System.exit(1); while (ch!=4);

7 Output: Program 22: //WAP to create a file according to a menu driven program in which i) create //a file ii) delete a file iii) writing into a file iv) reading a file v)exiting //a file //*delete option will work only if file is empty import java.util.*; import java.io.*; class Menus public static void main(string args[]) throws IOException int num; String file_name; File file; do System.out.println(" Enter your choice"); System.out.println(" 1: Create a file"); System.out.println(" 2: Delete a file");

8 System.out.println(" 3: Writing a file"); System.out.println(" 4: Reading a file"); System.out.println(" Exit"); Scanner scr = new Scanner(System.in); num = scr.nextint(); switch(num) case 1: BufferedReader in = new BufferedReader(new InputStreamReader (System.in)); System.out.println("Please enter the file name to create:"); file_name = in.readline(); file = new File(file_name); boolean create = file.createnewfile(); if(!create) System.out.println("File already exists"); System.exit(0); else System.out.println("File Created"); break; case 2: BufferedReader del = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter the file name to delete"); file_name = del.readline(); file = new File(file_name); long size = file.length(); if(!file.exists()) System.out.println("File doesn't exist");

9 else if(size == 0) file.delete(); System.out.println("File has been deleted"); else System.out.println("File is not empty"); break; case 3: BufferedReader inp = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter the file name which you want to edit:"); file_name = inp.readline(); file= new File(file_name); if(!file.exists()) System.out.println("File doesn't exist!"); else FileWriter fstream = new FileWriter(file_name); BufferedWriter out = new BufferedWriter(fstream); System.out.println("Please enter the text:"); out.write(inp.readline()); out.close(); System.out.println("file updated successfully"); break; case 4:

10 BufferedReader rd = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter the file name you want to read"); file_name=rd.readline(); file = new File(file_name); FileReader fr = new FileReader(file); int i; while((i=fr.read())!= -1) System.out.print((char)i); break; case 5: System.exit(0); break; default: System.out.println("invalid Entry!"); while(num!=5); Output:

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14 Program 23: //Write a Program to search a number of occurrences of a particular word in //a file. import java.io.*; class WordSearch public static void main(string[] args) String strline,filename,word; int count = 0; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); try System.out.println("Enter the filename:"); Filename = br.readline(); FileInputStream fstream = new FileInputStream(filename); BufferedReader infile = new BufferedReader(new InputStreamReader(fstream)); System.out.println("Enter the word to be searched:"); word=br.readline(); while ((strline = infile.readline())!= null)

15 String[] strarr = strline.split(" "); for(string str:strarr) if(str.equalsignorecase(word)) count++; if(count==0) System.out.println("The searched word is not present in the file"); else System.out.println(word+" exists "+count+" times in the file"); catch(exception e) OUTPUT:

16 Program 24: //WAP copy one file content into another file import java.io.*; class copy public static void main(string args[]) throws IOException File f1,f2; int c=0; BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter the first file: "); String file1= in.readline(); f1= new File(file1); BufferedReader out = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter the second file: "); String file2= out.readline(); f2= new File(file2); FileReader fr1 = new FileReader(f1); FileWriter fr2 = new FileWriter(f2); int i; while((i = fr1.read())!= -1) fr2.write(i); c=1; if(c==1) System.out.println("File has been copied!"); fr2.close();

17 Output: