如何对从文本文件读取的数据进行排序，然后在GUI中显示未排序和排序的数据？

Question

我有这个构造类，用于汽车的制造，型号，年份和里程。

public class Car {
private String make,model;
private int year,mileage;

public String toString() {
return "Car [make=" + make + ", model=" + model +", "
        + "year =" + year + ", mileage=" + mileage + "]"; }


public String getMake() {
    return make;
}
public Car(String make, String model, int year, int mileage) {
    super();
    this.make = make;
    this.model = model;
    this.year = year;
    this.mileage = mileage;
}
public void setMake(String make) {
    this.make = make;
}
public String getModel() {
    return model;
}
public void setModel(String model) {
    this.model = model;
}
public int getYear() {
    return year;
}
public void setYear(int year) {
    this.year = year;
}
public int getMileage() {
    return mileage;
}
public void setMileage(int mileage) {
    this.mileage = mileage;
}
}

现在，我有一个主类，可以从文本文件中读取数据，该文本文件具有该品牌，型号，年份，里程的顺序，并将其存储到数组中。

public class storing {

public static void main(String[] args) {

    TextFileInput fileInput = new TextFileInput("CarDetails.txt");
    ArrayList <Car> cars = new ArrayList<Car>();
    String line = fileInput.readLine();


    while(line!=null) {
        String [] values = new String [4];

        StringTokenizer st = new StringTokenizer(line,",");
        int numOfCommas = st.countTokens();

        for(int i = 0;i<numOfCommas;i++) {
            values[i]=(st.nextToken(","));
        }
        cars.add(new Car(values[0],values[1],Integer.parseInt(values[2]),Integer.parseInt(values[3])));

        line = fileInput.readLine();
    }

    CarGUI gui = new CarGUI(cars);

         }  
    }//main

我在理解应该如何实现Gui部分方面遇到麻烦，但是我的选择排序似乎无效。

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import java.util.ArrayList;

public class CarGUI extends JFrame {

private JTextArea unsorted,sorted;
private ArrayList<Car> cars;


public CarGUI(ArrayList<Car> c) {
    cars = c;
    setTitle("CarGUI");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(600,400);
    setLocationRelativeTo(null);
    setComponents();
    setVisible(true);

}


private void setComponents() {

    setLayout(new GridLayout(1,2));

    unsorted = new JTextArea();
    unsorted.setBackground(Color.CYAN);
    unsorted.setFont(new Font(Font.DIALOG, Font.BOLD, 12));
    unsorted.setEditable(false);
    unsorted.setBorder(BorderFactory.createLineBorder(Color.black));
    for(int i=0;i<cars.size();i++) {
        unsorted.append(cars.get(i).toString()+"\n");
    }

    add(unsorted);

    selectionSort(cars);

    sorted = new JTextArea();
    sorted.setBackground(Color.YELLOW);
    sorted.setFont(new Font(Font.DIALOG, Font.BOLD, 12));
    sorted.setEditable(false);
    sorted.setBorder(BorderFactory.createLineBorder(Color.black));
    for(int i=0;i<cars.size();++i) {
        sorted.append(cars.get(i).toString()+"\n");
    }

    add(sorted);
}

private void selectionSort(ArrayList<Car> c) {
    for (int i = 0; i<c.size()-1;i++) { 
          int indexLowest = i; 
          for(int j = i + 1;j<c.size();j++) {
             if (c.get(j).make() < c.get(indexLowest).make()) {indexLowest = j;}
          }
          if ( c.get(indexLowest) != c.get(i) ) { 
             Car temp = c.get(indexLowest);
             c.set(indexLowest,c.get(i)); 
             c.set(i, temp);
          }  
      } 

   }//SelectionSort
} 

我在这里的代码没有运行，但是我不确定为什么。请帮助我了解我出了什么问题。