对于这个程序，我想实现一系列排序和搜索算法。该数组将填充随机数。然后我想将每个数组元素绘制为条形（制作类似于条形图的东西）。我在 GUI 中有一个步骤和运行按钮，该步骤应该使用选择排序。我遇到的问题是：我只知道如何使用循环进行选择排序。但是，我不能使用循环，因为我必须显示正在逐步排序的数组。谁能告诉我如何在没有循环的情况下进行选择排序？我将添加到目前为止的所有代码，因为这是我第一次发布任何内容，并且我想确保我是具体的。
数组查看器：
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.util.Scanner;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ArrayViewer
{
static int[] array;
static int size;
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
//ask for the size of the array until the user enters a size in the right range
do
{
System.out.print("Enter the size of the array (should be between 10 and 80): ");
size=in.nextInt();
}
while (size<10 || size>80);
array= ArrayUtil.randomIntArray(size,100);//create a random array of given size and entries ranging from 0 to 100
final ArrayComponent arrayComp= new ArrayComponent(array); //construct an arrayComponent with the random array
class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
//I want the selection sort algorithm to go in here so I can just assign this to my stepButton.
}
}
final JFrame frame=new JFrame("Sorting"); //create and setup the frame
frame.setSize(1200,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel buttonPanel= new JPanel(); // panel to hold the buttons
JPanel panel=new JPanel(new BorderLayout()); // panel to hold the button panel and the array component; uses BorderLayout: read about it in the API
JButton stepButton=new JButton("Step"); //button to go through the algorithm step by step
JButton runButton=new JButton("Run"); //button to run the algorithm
ActionListener listener = new ButtonListener();
stepButton.addActionListener(listener);
buttonPanel.add(stepButton);
buttonPanel.add(runButton);
panel.add(buttonPanel,BorderLayout.PAGE_START); //add the buttonPanel at the top of the panel
panel.add(arrayComp,BorderLayout.CENTER); //add the arraycoponent object in the center of teh panel
frame.add(panel);
frame.setVisible(true);
//print the entries in the array
//System.out.println(arrayComp);
}
}
数组组件：
import javax.swing.JComponent;
import java.awt.Rectangle;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Dimension;
import java.awt.Color;
public class ArrayComponent extends JComponent
{
private int[] theArray;
final int dx=6; //the width of thebars (as well as the with of the spaces between bars)
private int space=0;
int index1 =0;
int index2 =0;
public ArrayComponent(int[] a)
{
theArray=a;
space=600-12*theArray.length/2; //space amount on the horizontal axes to center the graph
//600 is the frame width in the viewer program
//For each bar 12 units on the horixzontal axis is used including the space following it.
//something.addActionListener(new ButtonListener());
}
public void setIndices(int i, int j)
{
index1 = i;
index2= j;
}
public void paintComponent(Graphics g)
{
Graphics2D pen= (Graphics2D) g;
for (int k=0;k<theArray.length;k++)
{
pen.drawRect(space+2*k*dx,5,dx,theArray[k]);
//space: initial space
//2*k*dx: the (horizontal) distance of te kth bar from the start of the graph
//5: bars are located on y=5
//dx: the width of the bars
//theArray[k]: height of the kth bar
}
pen.fillRect(space+2*index1*dx,5,dx,theArray[index1]);
pen.fillRect(space+2*index2*dx,5,dx,theArray[index2]);
}
public String toString()
{
String str=("array=[");
int k=0;
for (k=0;k<theArray.length-1;k++)
str=str+theArray[k]+", ";
str=str+theArray[k]+"]";
return str;
}
}
ArrayUtil（创建随机数组）：
import java.util.Random;
/**
This class contains utility methods for array manipulation.
*/
public class ArrayUtil
{
private static Random generator = new Random();
/**
Creates an array filled with random values.
@param length the length of the array
@param n the number of possible random values
@return an array filled with length numbers between
0 and n - 1
*/
public static int[] randomIntArray(int length, int n)
{
int[] a = new int[length];
for (int i = 0; i < a.length; i++)
a[i] = generator.nextInt(n);
return a;
}
}
对不起，如果帖子很长。该程序已经绘制了数组，它只是不对它们进行排序。谢谢您的帮助。