CMP 202 TEST SOLUTIONS

CMP202 test Q3 Solution

TEXT FILE

1001,Infinix,x600,2015
1003,Infinix,x551,2017
1002,Infinix,x601,2016
1005,Sony,XPeria,2009
1006,Galaxy,s7,2008
1007,Gionee,Tab,2017
1010,Tecno,CX,2019


ENTITY CLASS

package Product;

import java.util.*;
public class ProductRecord implements Comparable <ProductRecord> {
int pId;
String pName;
String pModel;
int pYear;

public ProductRecord(int pId, String pName, String pModel, int pYear) {
this.pId = pId;
this.pName = pName;
this.pModel = pModel;
this.pYear = pYear;
}

public String toString(){
return pId + "," + pName + "," + pModel + "," + pYear;
}

// ThIS WILL HELP TO SORT THE RECORD IN DESCENDING ORDER
public int compareTo(ProductRecord record){
int var = record.pId - this.pId;

if(var > 0){
return 1;
} else if(var < 0) {
return-1;
} else {
return 0;
}
}

}



MAIN CLASS
package Product;

import java.util.*;
import java.io.*;
public class Products {

static    int  pId,
        pYear;
static String  pName,
        pModel;
static Scanner input = null;
public static void main(String[] args) {
      ArrayList<ProductRecord> products = new ArrayList<ProductRecord>();

try{
 //READING FROM A FILE
         File file = new File("records.txt");
   FileReader inputStream = new FileReader(file);
                BufferedReader inputBuffer = new BufferedReader(inputStream);
         input = new Scanner(inputBuffer);

   while(input.hasNextLine()){
        String line = input.nextLine();
        pId = Integer.parseInt(line.split(",")[0]);
  pName = line.split(",")[1];
        pModel = line.split(",")[2];
        pYear = Integer.parseInt(line.split(",")[3]);

  products.add(new ProductRecord(pId,pName,pModel,pYear));
}

if(!file.exists()){
         file.createNewFile();
}

 //3b: SAVE A NEW RECORD  TO THE FILE
       FileWriter outputStream = new FileWriter(file, true);
       BufferedWriter outputBuffer = new BufferedWriter(outputStream);
 PrintWriter outputPrinter = new PrintWriter(outputBuffer);


 input = new Scanner(System.in);
 for(int x = 0; x < 1; x++){
System.out.print("Enter Product ID: ");
pId = input.nextInt();

System.out.print("Enter Product Name: ");
pName = input.next();

System.out.print("Enter Product Model: ");
pModel = input.next();

System.out.print("Enter Product Year: ");
pYear = input.nextInt();



   //Add To the File
        outputPrinter.print("");
        outputPrinter.println(pId+", "+pName+", "+pModel+", "+pYear);

         products.add(new ProductRecord(pId,pName,pModel,pYear));
     }
   
            //Close the streams
     outputPrinter.flush();
     outputPrinter.close();

     //3a: SORTING THE RECORDS IN DESCENDING ORDER
            Collections.sort(products);

            //3c: DISPLAY RECORD
int serial_num = 0;
     for(ProductRecord p: products){
   num++;
   System.out.println(serial_num + " - " + p);
     }

}catch(IOException error){
System.out.println(error.getMessage());
}

}

}