一個可比的分揀機

Question

我想讓我的代碼比較我的隨機生成的對象的高度，並按升序對它們進行排序。我目前在理解一些基本概念時遇到了困難，就像我讀過java文檔一樣，我沒有找到適合我的答案。我知道我的分類監聽器中沒有任何東西，但是對於從這裏走到哪裏我有點不知所措。

編輯：我已經修復了部分代碼，但現在有一個問題，它只會重新繪製一些小節，偶爾它們會出錯。

import java.awt.event.*; 
import javax.swing.*; 
import java.awt.*; 
import java.util.Random; 

public class Lab7 extends JPanel 
{ 
    Random gen = new Random(); 
    boolean tick = true; 
    private static bars[] bar = new bars[20]; 
    private static Integer[] height = new Integer[20], heightTemp = new Integer[1]; 
    private final int WIDTH = 500, HEIGHT = 300; 
    private final int DELAY = 900; 
    private int size = 15; 
    int[] y = new int[20], yTemp = new int[1]; 
    int [] x = new int [20]; 
    Timer timer; 
    public Lab7() 
    { 
     if(tick == true) 
     { 
      for(int count = 0; count < bar.length; count++) 
      { 
       height[count] = gen.nextInt(250) + 5; 
       y[count] = (HEIGHT - height[count]); 
       x[count] = (count * size +(count*5)); 
       bar[count] = new bars(x[count], y[count], size, height[count]); 
      } 
      tick = false; 
     } 
     timer = new Timer(DELAY, new SortingListener()); 
     setPreferredSize(new Dimension(WIDTH, HEIGHT)); 
     setBackground(Color.white); 
     timer.start(); 
    } 
    public void paintComponent(Graphics page) 
    { 
     super.paintComponent(page); 
     for(int count = 0; count < bar.length; count++) 
     { 
      bar[count].draw(page); 
     } 
    } 
    private class SortingListener implements ActionListener 
    { 
     public void actionPerformed(ActionEvent event) 
     { 
      int min = 0; 

      for(int count = 0; count < height.length; count++) 
      { 
       for(int index = count + 1; index < height.length; index ++) 
       { 

        if(height[count].compareTo(height[index]) > 0) 
        { 
         heightTemp[0] = height[count]; 
         yTemp[0] = y[count]; 
         height[count] = height[index]; 
         y[count] = y[index]; 
         height[index] = heightTemp[0]; 
         y[index] = yTemp[0]; 
        } 
        System.out.println(count + ":" + min); 

        if(index == 19 && height[count].compareTo(height[index]) != 0) 
        { 
         bar[count] = new bars(x[count], y[count], size, height[count]); 
         bar[index] = new bars(x[index], y[index], size, height[index]); 
        } 

       } 
       repaint(); 
      } 
      timer.stop(); 
     } 
    } 
    public static void main(String[]args) 
    { 
     JFrame frame = new JFrame("Lab7"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.getContentPane().add(new Lab7()); 
     frame.pack(); 
     frame.setVisible(true); 
    } 
} 

這裏還有Bars類。

public class bars{ 

Random gen = new Random(); 
private int width = 20, height, x, y; 
private int R = gen.nextInt(256); 
private int G = gen.nextInt(256); 
private int B = gen.nextInt(256); 
public Color RandomColor; 

//creates a rectangle 
public bars(int x, int y, int width, int height) 
{ 
    this.x = x; 
    this.y = y; 
    this.width = width; 
    this.height = height; 
} 

public void draw(Graphics page) 
{ 
    Color RandomColor = new Color(R, G, B); 
    page.setColor(RandomColor); 
    page.fillRect(x, y, width, height); 
    Polygon p = new Polygon(); 
    page.setColor(RandomColor); 
    page.fillPolygon(p); 

} 
public void setWidth(int width) 
{this.width = width;} 

public int getWidth() 
{return width;} 

public void setHeight(int height) 
{this.height = height;} 

public int getHeight() 
{return height;} 

public void setX(int x) 
{this.x = x;} 

public int getX() 
{return x;} 

public void setY(int y) 
{this.y = y;} 

public int getY() 
{return y;} 

public void setColor(Color RandomColor) 
{this.RandomColor = RandomColor;} 

public Color getColor() 
{return RandomColor;}} 

Answer 1

如果您正在進行選擇排序，則內部循環需要從外部循環的值開始。更改

for(int index = 0; 

到

for(int index = count; 

你得到的錯誤是，名單未排序嗎？它看起來只有「排序」列表的第一個元素將在正確的位置。