Question

Please help me do the java project

For this project you will be reading in a text file and evaluating it in order to create a new file that represents the Class that will represent the properties of the text file. For example, consider the following text file:

students.txt

ID              Name                              Age                    IsMale           GPA

1                Tom Ryan                       22                       True              3.1

2                Jack Peterson                31                       True              2.7

3                Cindy LuWho                12                       False             3.9

When you read in the header line, you will need to create the properties to go along with these. The problem is what datatype to use for each… In order to do this you will also need to read the data that goes along with each field, determine what datatype you need to set for the filed, and then create the property. The example main() code on the following page will give help you to do this. I’ve created the methods for you to use in your code.

I would suggest you create yourself a class called Property with, at least, two String properties. You may want to add some methods in the class as well to make things easier when creating the output but it is not necessary:

public class Property {

       public String fieldName;

       public String dataType;

}

So, once you have determined each field name and datatype you will need to create a Class with properties, constructors, methods, and getters/setters. The below is, if done correctly, the auto created class file called Students.java

public class Students {

       //====================================== Properties

private int iD;

private String name;

private int age;

private boolean isMale;

private double gPA;

       //====================================== Constructors

       public Student(int iD, String name, int age, boolean isMale, double gPA) {

              setID(iD);

              setName(name);

              setAge(age);

              setIsMale(isMale);

              setGPA(gPA);

       }

       public Student(Scanner fin) throws Exception {

              String[] parts = fin.nextLine().split("\t");

              setID(Integer.parseInt(parts[0]);

              setName(parts[1]);

              setAge(Integer.parseInt(parts[2]);

              setIsMale(Boolean.parseBoolean(parts[3]));

              setGPA(Double.parseDouble(parts[4]));

       }

       //====================================== Methods

       public boolean equals(Object obj) {

              if(!(obj instanceof Student)) return false;

              Student s = (Student)obj;

              return getEqualsString().equals(s.getEqualsString());

       }

private String getEqulsString() {

       return iD + "~" + name + "~" + age + "~" + isMale + "~" + gPA;

}

       public String toString() {

              return "ID: " + iD + ", Name: " + name + ", Age: " + age + ", IsMale: " + isMale + ", GPA: " + gPA;

       }

       //====================================== Getters/Setters

       ... you know what to do here

Sample code for checking datatypes

public static void main(String[] args) {

            String[] data = {"1", "Tom Ryan", "22", "True", "3.1"};    

            for(String s : data) {

                  System.out.println(s + " isInt: " + isInt(s));

                  System.out.println(s + " isLong: " + isLong(s));

                  System.out.println(s + " isFloat: " + isFloat(s));

                  System.out.println(s + " isBoolean: " + isBoolean(s));

                  System.out.println("======================================");

            }

      }

      // Methods for checking for datatype o

      public static boolean isInt(String val) {

            try {

                  Integer.parseInt(val);

                  return true;

            } catch (Exception e) { return false; }

      }

     

      public static boolean isLong(String val) {

            try {

                  Long.parseLong(val);

                  return true;

            } catch (Exception e) { return false; }

      }

           

      public static boolean isFloat(String val) {

            try {

                  if(val.contains(".")) {

                        Double.parseDouble(val);

                        return true;

                  }

                  return false;

            } catch (Exception e) { return false; }

           

      }

     

      public static boolean isBoolean(String val) {

            return val.equalsIgnoreCase("True") || val.equalsIgnoreCase("False");        

      }

Answer 1

//Use this java code It may help you

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class Students {

    //====================================== Properties

    private int iD;

    private String name;

    private int age;

    private boolean isMale;

    private double gPA;

    //====================================== Constructors

    public Students(int iD, String name, int age, boolean isMale, double gPA) {

        setID(iD);

        setName(name);

        setAge(age);

        setIsMale(isMale);

        setGPA(gPA);

    }

    public Students(Scanner fin) throws Exception {

        String line  = fin.nextLine();
        Scanner words = new Scanner(line);
       /* String[] parts = fin.nextLine().split("\t");
        if(isInt(parts[0]))
        setID(Integer.parseInt(parts[0]));
        setName(parts[1]);
        if(isInt(parts[2]))
        setAge(Integer.parseInt(parts[2]));
        if(isBoolean(parts[3]))
        setIsMale(Boolean.parseBoolean(parts[3]));
        if(isFloat(parts[4]))
        setGPA(Double.parseDouble(parts[4]));*/
       setID(words.nextInt());
       setName(words.next()+" "+words.next());
       setAge(words.nextInt());
       setIsMale(words.nextBoolean());
       setGPA(words.nextDouble());

    }
    //setters

    public void setID(int iD) {
        this.iD = iD;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setIsMale(boolean male) {
        isMale = male;
    }

    public void setGPA(double gPA) {
        this.gPA = gPA;
    }


    //====================================== Methods

    public boolean equals(Object obj) {

        if(!(obj instanceof Students)) return false;

        Students s = (Students)obj;

        return getEqualsString().equals(s.getEqualsString());

    }

    private String getEqualsString() {

        return iD + "~" + name + "~" + age + "~" + isMale + "~" + gPA;

    }

    public String toString() {

        return "ID: " + iD + ", Name: " + name + ", Age: " + age + ", IsMale: " + isMale + ", GPA: " + gPA;

    }

    //====================================== Getters/Setters

      /* ... you know what to do here

    Sample code for checking datatypes*/

    public static void main(String[] args) {
/*
        String[] data = {"1", "Tom Ryan", "22", "True", "3.1"};

        for(String s : data) {

            System.out.println(s + " isInt: " + isInt(s));

            System.out.println(s + " isLong: " + isLong(s));

            System.out.println(s + " isFloat: " + isFloat(s));

            System.out.println(s + " isBoolean: " + isBoolean(s));

            System.out.println("======================================");

 */

            try {
                Scanner scanFile = new Scanner(new File("students.txt"));
                //read header
                String header = scanFile.nextLine();
                
                while (scanFile.hasNextLine()) {
                    Students students = new Students(scanFile);
                    //print student data
                    System.out.println(students);
                }
            }
            catch (FileNotFoundException e)
            {
                System.err.println("File not found...");
            } catch (Exception e) {
                e.printStackTrace();
            }

    }



    // Methods for checking for datatype o

    public static boolean isInt(String val) {

        try {

            Integer.parseInt(val);

            return true;

        } catch (Exception e) { return false; }

    }



    public static boolean isLong(String val) {

        try {

            Long.parseLong(val);

            return true;

        } catch (Exception e) { return false; }

    }



    public static boolean isFloat(String val) {

        try {

            if(val.contains(".")) {

                Double.parseDouble(val);

                return true;

            }

            return false;

        } catch (Exception e) { return false; }



    }



    public static boolean isBoolean(String val) {

        return val.equalsIgnoreCase("True") || val.equalsIgnoreCase("False");

    }
}

//File

//Output

//If you need any help regarding this solution ........... please leave a comment ......... thanks