Question

I have some issues with the passing array values to the constructor. I have a file.txt which contains some lines with values, for example:

peter|berlin|germany|0930295235|foo.

I figured out how to transform the lines into the arrays. But I don’t know how to pass the values from arrays to the constructor to transform the arrays into the objects with the array attributes.

Here is the main class:

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.InputStreamReader;


public class FileReader {

    public static void main(String[] args) {
        try {
            // Open the file that is the first 
            // command line parameter
            FileInputStream fstream = new FileInputStream("file.txt");
            // Get the object of DataInputStream
            DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String strLine;

            // Read the file line by line
            while ((strLine = br.readLine()) != null) {
                // Print the content on the console
                String s[] = strLine.split("\\|");
                // System.out.println(java.util.Arrays.toString(s));
                // System.out.println (strLine);
                for (String element : s) {
                    System.out.println(element);
                    // HERE I NEED TO PASS THE ARRAY VALUES FOR EACH LINE TO TRANSFORM THE ARRAYS TO OBJECTS
                    Item item = new Item(element,element,element,element,element);
                    System.out.println("*************************************");
                }
                // Close the input stream
                in.close();
            } catch (Exception e) { //Catch exception if any
                System.err.println("Error: " + e.getMessage());
        }
    }
}

Here is the class Item:

public class Item {

    private String name;
    private String city;
    private String state;
    private String number;
    private String foo;

    public Object(String name, String city, String state, String number,String foo){
        this.name = name;
        this.city = city;
        this.state = state;
        this.number = number;
        this.foo = foo; 
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getState() {
        return state;
    }
    public void setState(String state) {
        this.state = state;
    }
    public String getNumber() {
        return number;
    }
    public void setNumber(String number) {
        this.number = number;
    }
    public String getFoo() {
        return foo;
    }
    public void setFoo(String foo) {
        this.foo = foo;
    }
}

I need objects for more work with the data. I appreciate any help.

Answer 1

I think what you want to do is something like the following, although it’s not entirely clear.

String s[] = strLine.split("\\|");
Item item = new Item(s[0], s[1], s[2], s[3], s[4]);

Also note that after you’ve created your new Item object it will fall out of scope nearly immediately, so you need to store it in some sort of container declared outside of your while loop:

List<Item> items = new ArrayList<Item>();
String line;

while((line = br.readLine()) != null) {
    String[] words = line.split("\\|");
    Item item = new Item(words[0], words[1], words[2], words[3], words[4]);
    items.add(item);
}