如何实现Comparable类

时间:2012-11-06 04:16:09

标签: java comparable

好的,我想出了如何制作GUI类和排序类,但似乎可以弄清楚如何实现类比的类。我需要创建随机大小的矩形,然后将它们排序。感谢任何帮助再次感谢。

import java.util.*;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;



public class TwoSorts extends Applet implements ActionListener

{
private final int APPLET_WIDTH = 600;
private final int APPLET_HEIGHT = 600;
Button sort;
Label sort_label;
String pr_name;
int[] random = new int[20];
int[] sorter = new int[20];


public void init()

{

    sort = new Button("Sort");
    add(sort);
    sort.addActionListener(this);
    sort_label = new Label("Orange Selection / Black Bubble");
    add(sort_label);
    randomGen(random);
    sorter = random; 
    setBackground (Color.white);
    setSize (APPLET_WIDTH, APPLET_HEIGHT); 
}  

private void randomGen (int...random) {


    for (int i = 0; i < 20; i++){
        random [i] = (int) (20 +(Math.random()*300-20));
        }
}

public void paint(Graphics g)
{
    for (int i = 0; i < 20; i++ ){


        g.setColor(Color.blue);
        g.fillRect((int) (10 + (i*50)), 300, 50, ((random[i])));
        g.setColor(Color.black);
        g.fillRect((int) (10 + (i*50)), 300, 25, (sorter[i]));
    }

    g.drawRect (20, 30, 130, 50);
  sort.setLocation(0,220);
  sort_label.setLocation(0,270);
  sort_label.setSize(400,30);
}


public void actionPerformed(ActionEvent e) {


    Sorting.selectionSort(random);
    Sorting.insertionSort (sort);
    repaint();

}
}

这是我的排序类

    import java.awt.event.ActionEvent;


 public class Sorting{

    public static void selectionSort (Comparable[] list)    {

        int min;
        Comparable temp;

        for (int index = 0; index < list.length-1; index++)
        {
            min = index;
            for (int scan = index+1; scan < list.length; scan++)
                if (list[scan].compareTo(list[min]) < 0)
                    min = scan;

            temp = list[min];
            list[min] = list[index];
            list[index] = temp;
        }
    }

    public static void insertionSort (Comparable[] sorter)  {

        for (int index = 1; index < sorter.length; index ++){
            Comparable key = sorter[index];
            int position = index;
            while (position > 0 && key.compareTo(sorter[position-1]) < 0){
                sorter [position] = sorter[position-1];
                position--;
            }

            sorter[position] = key;
        }
    }

然后这是我可比较的课程,我需要一些帮助

    public class width implements Comparable {

int[] random = new int[20];
int[] sorter = new int[20];



@Override
public int compareTo(Object o) {

    int result = 0;

    if(random[1] == sorter[1])
        result = random.length;
    return result;

}

1 个答案:

答案 0 :(得分:3)

你的同类课程应该是你要分类的。在这种情况下,您生成一个int的随机数组,因此您实际上不需要实现compareTo,因为Integer已经实现了compareTo。如果你要排序的东西比整数更复杂,你会创建一个新的类width

例如,如果您的Applet有一堆圆圈,它将按大小排序,您可以使用以下内容:

public class Circle implements Comparable<Circle> {
    private Point center;
    private double radius;

    public Circle(double radius, Point center) {
        this.center = center;
        this.radius = radius;
    }

    // Other drawing functionality

    public int compareTo(Circle c) {
        if (c.radius > radius) return -1;
        if (c.radius == radius) return 0;
        return 1;
    }
}
你知道吗?我们的对象更复杂,所以我们需要教Java如何比较一个圆圈,因为它不知道。