I am neo java week 14

 

If any error comes comment below...

Skill builder

1. Count Uppercase and Lowercase Letters

import java.io.*; import java.util.*; class Sample { public static void main(String args[]) throws Exception{ Scanner sc=new Scanner(System.in); FileWriter fw=new FileWriter("output.txt"); String ch; int upper=0,lower=0,number=0,special=0; String s=sc.nextLine(); fw.write(s); fw.close(); FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } Integer i=fr.read(); Integer eof=-1; ch=i.toString(); while (ch.charAt(0)!=eof.toString().charAt(0)) { if (Integer.parseInt(ch) >= 'A' && Integer.parseInt(ch) <= 'Z') upper++; else if (Integer.parseInt(ch) >= 'a' && Integer.parseInt(ch) <= 'z') lower++; i=fr.read(); ch=i.toString(); } System.out.println(upper); System.out.println(lower); } }

2. Write a program to obtain a string and append it to the end of a file.

try { BufferedWriter out = new BufferedWriter( new FileWriter(fileName, true)); out.write(str); out.close(); } catch (IOException e) { System.out.println("exception occoured" + e); } } public static void main(String[] args) throws Exception { // Let us create a sample file with some text String fileName = "source.txt"; try { BufferedWriter out = new BufferedWriter( new FileWriter(fileName)); out.write("Hello World\n"); out.close(); } catch (IOException e) { System.out.println("Exception Occurred" + e); } // Let us append given str to above // created file. Scanner sc = new Scanner(System.in); String str = sc.nextLine(); appendStrToFile(fileName, str); // Let us print modified file try { BufferedReader in = new BufferedReader( new FileReader("source.txt")); String mystring; while ((mystring = in.readLine()) != null) { System.out.println(mystring); } } catch (IOException e) { System.out.println("Exception Occurred" + e); } }

3. Write a program that reads a text file, and determines the total number of words and the number of sentences

//this code is in c++ int words = 1; int sentences = 0; for (int i = 0; i < int(userInput.length()); i++) { if (userInput.empty()) { words--; } if (userInput[i] == ' ') words++ ; if (userInput[i] == '.') sentences++; }

4. Count Number of Digits

import java.io.*; import java.util.*; class Sample { public static void main(String args[]) throws Exception{ Scanner sc=new Scanner(System.in); FileWriter fw=new FileWriter("output.txt"); String ch; int number=0; String s=sc.nextLine(); fw.write(s); fw.close(); FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } Integer i=fr.read(); Integer eof=-1; ch=i.toString(); while (ch.charAt(0)!=eof.toString().charAt(0)) { if (Integer.parseInt(ch) >= '0' && Integer.parseInt(ch) <= '9') number++; i=fr.read(); ch=i.toString(); } System.out.println(number); } }

5. Print the words with vowels

import java.io.*; import java.util.*; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; class CreateFile { public static void main(String[] args) throws IOException { String str; Scanner sc = new Scanner(System.in); str = sc.nextLine(); FileWriter fw=new FileWriter("output.txt"); for (int i = 0; i < str.length(); i++) fw.write(str.charAt(i)); fw.close(); FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } BufferedReader br = new BufferedReader(fr); String[] words=null; String s; int flag=0; while((s=br.readLine())!=null) { words=s.split(" "); for(int i=0;i<words.length;i++) { for(int j=0;j<words[i].length();j++) { char ch=words[i].charAt(j); if(ch == 'a' || ch == 'e' || ch == 'i' ||ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') { flag=1; } } if(flag==1) { System.out.println(words[i]); } flag=0; } } fr.close(); } }

6. FileWriter and FileReader

import java.io.*; import java.util.*; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; class CreateFile { public static void main(String[] args) throws IOException { String str1,str2; Scanner sc = new Scanner(System.in); str1 = sc.nextLine(); str2 = sc.nextLine(); FileWriter fw=new FileWriter("output.txt"); for (int i = 0; i < str1.length(); i++) fw.write(str1.charAt(i)); fw.write("\n"); for (int i = 0; i < str2.length(); i++) fw.write(str2.charAt(i)); fw.close(); int ch; FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } while ((ch=fr.read())!=-1) System.out.print((char)ch); fr.close(); } }

7. Write integer array to a file

import java.io.*; import java.util.*; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; class CreateFile { public static void main(String[] args) throws IOException { int n; Scanner sc = new Scanner(System.in); n = sc.nextInt(); int [] arr = new int[n]; int i; for(i=0;i<n;i++) { arr[i] = sc.nextInt(); } FileWriter fw=new FileWriter("output.txt"); for (i = 0; i < n; i++) fw.write(arr[i]); fw.close(); FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } int ch,sum=0; while ((ch=fr.read())!=-1) { System.out.print((int)ch+" "); sum += (int)ch; } System.out.println(sum); fr.close(); } }

8. Write a program to copy the contents of one file to another.

FileInputStream in = new FileInputStream(a); FileOutputStream out = new FileOutputStream(b); try { int n; // read() function to read the // byte of data while ((n = in.read()) != -1) { // write() function to write // the byte of data out.write(n); } } catch(Exception e) { System.out.println("Couldn't copy"); } finally { if (in != null) { // close() function to close the // stream in.close(); } // close() function to close // the stream if (out != null) { out.close(); } } System.out.println("File Copied"); } public static void main(String[] args) throws Exception { String str1; Scanner sc = new Scanner(System.in); str1 = sc.nextLine(); FileWriter fw1=new FileWriter("source.txt"); FileWriter fw2=new FileWriter("target.txt"); File x = new File("source.txt"); File y = new File("target.txt"); System.out.println(str1); for (int i = 0; i < str1.length(); i++) fw1.write(str1.charAt(i)); copyContent(x,y); }

Challange yourelf

9. Write a Java program to record the airport details into the text file.

FileWriter writer =new FileWriter("File1.txt"); Scanner sc = new Scanner(System.in); int n =Integer.parseInt(sc.nextLine()); n=n*3; writer.write(sc.nextLine()); for(int i=1;i<n;i++) writer.write(","+sc.nextLine()); writer.close();

10. Write a Java program to read the client information from text file (File1.txt)

class Client { int clientid; String name; String email; String phonenumber; String country; public Client(int clientid, String name, String email, String phonenumber, String country) { super(); this.clientid = clientid; this.name = name; this.email = email; this.phonenumber = phonenumber; this.country = country; } } class idCompare implements Comparator<Client> { public int compare(Client s1, Client s2) { return s1.clientid-s2.clientid; } } class Main { public static void main(String[] args)throws IOException { FileCreation fc =new FileCreation(); fc.createFile(); BufferedReader reader = new BufferedReader(new FileReader("File1.txt")); ArrayList<Client> clientRecords = new ArrayList<Client>(); String currentLine = reader.readLine(); while (currentLine != null) { String[] clientDetail = currentLine.split(" "); int clientid = Integer.valueOf(clientDetail[0]); String name = clientDetail[1]; String email =clientDetail[2]; String phonenumber=clientDetail[3]; String country=clientDetail[4]; clientRecords.add(new Client(clientid, name,email,phonenumber,country)); currentLine = reader.readLine(); } Collections.sort(clientRecords, new idCompare()); BufferedWriter writer = new BufferedWriter(new FileWriter("File2.txt")); for (Client client : clientRecords) { writer.write(client.name); writer.write(" "+client.clientid+" "+client.email+" "+client.phonenumber+" "+client.country); writer.newLine(); } reader.close(); writer.close();

11. File handling is an important technique that you need to accustom with

import java.io.*; import java.util.*; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; class CreateFile { public static void main(String[] args) throws IOException { String str; Scanner sc = new Scanner(System.in); str = sc.nextLine(); FileWriter fw=new FileWriter("output.txt"); for (int i = 0; i < str.length(); i++) fw.write(str.charAt(i)); fw.close(); int ch; FileReader fr=null; try { fr = new FileReader("output.txt"); } catch (FileNotFoundException fe) { System.out.println("File not found"); } while ((ch=fr.read())!=-1) System.out.print((char)ch); fr.close(); } }