how to display data in a table from an external file

[aquagirl20]

I'm new in using tables. I have a series of getter methods and I wants to display them in a table. I've been trying to use the external file that my program saves but I'm having a hard time how to display it in the table. Then my classmate told me that it's easier to just use methods in our CarRecordManage r class. The external file contains several data types... (int, String, String, double, int) to be specific... In that order as well How can I do this? Can somebody please help me?

Here is the RecordManager class:

package util;
 
import java.util.*;
import java.io.*;
 
public class CarRecordManager{
private RandomAccessFile raf;
private int NUMBER_OF_SPACES = 0;
private StringBuilder SPACE;
private Product[] productList;
 
public CarRecordManager(String fileName)throws IOException{
    raf = new RandomAccessFile(fileName, "rw");
    countSpace();
}
/*
    add operation
*/
public void addNewCar(Product p)throws IOException{
    //error traps
    if(!inRange(p.getProductID())) return;
    if(productExists(p.getProductName())){
        System.out.println(p.getProductName()+" already exists. Operation cancelled.");
        return;
    }
 
    //main operation
    int index;
    if(hasSpace()){
        index = getIndexOfSpace();
        p.appendID(index);
    }else{
        index = p.getProductID();
    }
    raf.seek(index*Product.RECORD_SIZE);
    p.writeData(raf);
    refresh();
    raf.close();
}
/*
    delete operation
*/
public void deleteRecordAt(int index)throws IOException{
    //error traps
    if(!inRange(index)) return;
    if(productList[index].getProductName().equals("?")) return;
 
    //main operation
    raf.seek(index * Product.RECORD_SIZE);
    Product tempProduct = new Product(index, "?", 0.0, 0);
    tempProduct.writeData(raf);
    refresh();
}
 
/*
    append operators
*/
public void appendQuantityAt(int index, int quantity)throws IOException{
    //error traps
    if(!inRange(index)) return;
    if(productList[index].getProductName().equals("?")) return;
 
    //main operation
    raf.seek(index * Product.RECORD_SIZE);
    Product tempProduct = productList[index];
    tempProduct.appendQuantity(quantity);
    tempProduct.writeData(raf);
    refresh();
}
public void appendPriceAt(int index, double price)throws IOException{
    //error traps
    if(!inRange(index)) {
            return;
        }
    if(productList[index].getProductName().equals("?")) {
            return;
        }
 
    //main operation
    raf.seek(index * Product.RECORD_SIZE);
    Product tempProduct = productList[index];
    tempProduct.appendPrice(price);
    tempProduct.writeData(raf);
    refresh();
}
public void appendNameAt(int index,String name)throws IOException{
    //error traps
    if(!inRange(index)) return;
    if(productList[index].getProductName().equals("?")) return;
 
    //main operation
    raf.seek(index * Product.RECORD_SIZE);
    Product tempProduct = productList[index];
    tempProduct.appendName(name);
    tempProduct.writeData(raf);
    refresh();
}
public void appendProductAt(int index, Product product)throws IOException{
    //error traps
    if(!inRange(index)) return;
    if(productList[index].getProductName().equals("?")) return;
 
    //main operation
    raf.seek(index * Product.RECORD_SIZE);
    product.appendID(index);
    product.writeData(raf);
    refresh();
}
/*
    record accessor
*/
public Product getRecordAt(int index){
    return productList[index];
}
/*
    property accessors
*/
public int getProductIDAt(int index){
    return productList[index].getProductID();
}
public String getProductNameAt(int index){
    return productList[index].getProductName();
}
public double getProductPriceAt(int index){
    return productList[index].getProductPrice();
}
public int getProductQuantityAt(int index){
    return productList[index].getProductQuantity();
}
/*
    index accessors
*/
public int indexOf(String name){
    int index = -1;
    for (Product e : productList){
        if(e.getProductName().equalsIgnoreCase(name)){
            index = e.getProductID();
        }
    }
    return index;
}
public int indexOf(Product p){
    int index = -1;
    for (Product e : productList){
        if(e.getProductName().equalsIgnoreCase(p.getProductName())){
            index = e.getProductID();
        }
    }
    return index;
}
public int getLastIndex()throws IOException{
    return (int)(raf.length() / Product.RECORD_SIZE);
}
 
/*
    boolean checkers
*/
public boolean inRange(int index)throws IOException{
    if(index>getLastIndex()) return false;
    else return true;
}
public boolean hasSpace(){
    if(NUMBER_OF_SPACES>0) return true;
    else return false;
}
public boolean dataExistsAt(int index){
    if(index >= productList.length){
        System.out.println("Index out of bound!");
        return false;
    }
    if(productList[index].getProductName().equals("?")){
        System.out.println("Index exists but is considered a Space! ");
        return false;
    }else return true;
}
public boolean productExists(String name){
    boolean found=false;
    for (Product e : productList){
        if(e.getProductName().equalsIgnoreCase(name)){
            found=true;
        }
    }
    return found;
}
 
/*
    console helps
*/
public void print(){
    for (Product e : productList){
        if(!e.getProductName().equals("?")){
            System.out.println(e);
        }
    }
}
public void printRecordAt(int index){
    System.out.println(productList[index]);
}
public void printByProductID(){
    sortByProductID();
    print();
}
public void printByProductName(){
    sortByProductName();
    print();
}
public void printByProductPrice(){
    sortByProductPrice();
    print();
}
public void printByProductQuantity(){
    sortByProductQuantity();
    print();
}
 
/*
    sorting operations
*/
public void sortByProductID(){
    for(int i=0;i<productList.length;i++){
        for(int j=i+1;j<productList.length;j++){
            if(productList[i].getProductID() > productList[j].getProductID()){
                Product temp = productList[i];
                productList[i] = productList[j];
                productList[j] = temp;
            }
        }
    }
}
public void sortByProductName(){
                        Arrays.sort(productList);
    //operation erased
}
public void sortByProductPrice(){
    for(int i=0;i<productList.length;i++){
        for(int j=i+1;j<productList.length;j++){
            if(productList[i].getProductPrice() > productList[j].getProductPrice()){
                Product temp = productList[i];
                productList[i] = productList[j];
                productList[j] = temp;
            }
        }
    }
}
public void sortByProductQuantity(){
    for(int i=0;i<productList.length;i++){
        for(int j=i+1;j<productList.length;j++){
            if(productList[i].getProductQuantity() > productList[j].getProductQuantity()){
                Product temp = productList[i];
                productList[i] = productList[j];
                productList[j] = temp;
            }
        }
    }
}
 
/*
    private methods
*/
private void countSpace()throws IOException{
    productList = new Product[getLastIndex()];
    for (int i = getLastIndex() - 1; i >= 0; i--){
        productList[i] = new Product();
        raf.seek(i * Product.RECORD_SIZE);
        productList[i].readData(raf);
    }
    SPACE = new StringBuilder();
    for (Product e : productList){
        if(e.getProductName().equals("?")){
            NUMBER_OF_SPACES++;
            SPACE.append(e.getProductID()+",");
        }
    }
}
private int getIndexOfSpace()throws IOException{
    int index = 0, ctrl = 0;
    String temp = "";
    String space = SPACE.toString();
    while(space.charAt(ctrl) != ','){
        temp += Character.toString(space.charAt(ctrl));
        ctrl++;
    }
    index = Integer.parseInt(temp);
    while((ctrl)>=0){
        SPACE.deleteCharAt(ctrl);
        ctrl--;
    }
    refresh();
    return index;
 
}
private void reset()throws IOException{
    sortByProductID();
    refresh();
}
private void refresh()throws IOException{
    countSpace();
}
}

I wanted to display the data with a click of a button but I don't know how to. Can somebody please help me.

I tried to use the getters from the CarRecordManage r but I wasn't successful.

Here's the part that I tried to code for the displaying of data:

public void readFile() throws Exception{
for(int i = 0; i<inventoryTable.getRowCount(); i++){
 inventoryTable.(cars.getProductIDAt(i), new Object[]{cars.getProductIDAt(i), cars.getProductNameAt(i), cars.getProductPriceAt(i),
                       cars.getProductQuantityAt(i)});}}

And this is also that part on how I add items to my external files.

public void add() throws Exception{
 
            String brand = brandTxt.getText();
            String model = modelTxt.getText();
            String displacement = engineTxt.getText();
            double price = Double.parseDouble(priceTxt.getText());
            int quantity = Integer.parseInt(quantityTxt.getText());
 
            switch(brand){
                case "Honda":
                    cars = new CarRecordManager("hondaInventory.txt");
                    cars.addNewCar(new Product(cars.getLastIndex(), model, displacement, price, quantity));
                    JOptionPane.showMessageDialog(null, "You have successfully added a car under " + brand+".");
                    break;
 
                case "Ford":
                    cars = new CarRecordManager("fordInventory.txt");
                    cars.addNewCar(new Product(cars.getLastIndex(), model, displacement, price, quantity));
                    JOptionPane.showMessageDialog(null, "You have successfully added a car under " + brand+".");
                    break;
 
                case "Toyota":
 
                   cars = new CarRecordManager("toyotaInventory.txt");
                  cars.addNewCar(new Product(cars.getLastIndex(), model, displacement, price, quantity));
                   JOptionPane.showMessageDialog(null, "You have successfully added a car under " + brand+".");
                   break; 
            }
     }

I have attached a screenshot of my program on how it looks like.

[rajujrk]

Hi,

See, if you want to load the data into JTable, you have to use DefaultTableMod el. I have given below sample how to load the data into the JTable. You can place the code where you want

// Initialize JTable and DefaultTableModel
JTable jtbTable =new javax.swing.JTable();
    DefaultTableModel dtmRecordDetails = null;
    dtmRecordDetails = new DefaultTableModel(
                new Object[][]{},
                new String[]{
                    "PRODUCT",
                    "PRICE",
                    "QUANTITY",
                }) {
 
            boolean[] canEdit = new boolean[]{
                false,false,false
            };
// Set the Model in JTable
       jtbTable.setModel(dtmRecordDetails);
 
.
.
.
.
 
// Add the Records in each row
        Vector vctData=new Vector(3,2);
        v.addElement(strProduct);
        v.addElement(dblPrice);
        v.addElement(intQty);
        dtmRecordDetails.addRow(v);
 

Thanks
Rajkumar

[aquagirl20]

Thanks Rajkumar... I'll try to do this... I hope it will work...