在写一个排序算法演示程序

先在主窗体中的Listener中调用engine：

private class StartListener implements ActionListener{
		public void actionPerformed(ActionEvent e){

			
			int[] unsort=UnsortGenerator();  //函数返回给unsort一个数组
			
			
			engine.setArray(unsort);
			engine.setAlgorithm(getAlgorithm());
			engine.setSleepTime(jslSpeed.getValue()*50);
			engine.setHistogram(histogram);  //Histogram是用来画柱状图的
			engine.run();
		}
	}

然后在Engine中：

private SelectionSort selectionSort=new SelectionSort();
...
if (thread != null && thread.getState() != Thread.State.TERMINATED)
				return;
			
			thread=new Thread(selectionSort);
			selectionSort.setArray(unsort);
			thread.start();

在SelectionSort中：

public class SelectionSort implements Runnable{
	private int[] unsort;
	private Histogram histogram;
	private int sleepTime;
	
	public void run(){
		selectionSort();
	}

	public void setArray(int[] unsort){
		this.unsort=unsort;
	}
	
	private void selectionSort(){
		
		int key=0;
		int count=0;
		while(countunsort[i])
					key=i;
			}	
			int temp=unsort[count];
			unsort[count]=unsort[key];
			unsort[key]=temp;
			
			count++;
			key=count;
			
			for(int i=0;i

请问这段代码哪里有问题？如何修改？

提前感谢！