Question

我试图让我的代码比较我随机生成的对象的高度，并按升序对它们进行排序。我目前在理解一些基本概念方面遇到了困难，而且尽管我阅读了java文档，但我找不到适合我的答案。我知道我的排序听众中没有任何东西，但我对从哪里去的地方感到有些不知所措。

编辑：我已经修复了部分代码，但现在问题在于它只重绘了一些条形图，有时它们会出现故障。

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);
    }
}

这里也是Bars类。

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

如果您正在进行选择排序，则内部循环需要从外部循环的值开始。变化

for(int index = 0;

到

for(int index = count;

你得到的错误是列表没有排序吗？看起来只有“已排序”列表的第一个元素才会出现在正确的位置。

一个类似的分拣机

1 个答案: