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删羊操作
//利用迭代器遍历羊群并删除。 int i; public void Iterator{ Sheep[] sheep = new Sheep[] {new Sheep("喜羊羊"), new Sheep("美羊羊"), new Sheep("慢羊羊"), new Sheep("沸羊羊"), new Sheep("懒羊羊")}; Iterator sum=sheep.Iterator(); while(sum.hasNext()){ Sheep sheep=(Sheep)sum.next(); sum.remove(); } } //寻常的for循环从前向后删 for(i=1;i<sheepList.size()+1;i++){ sheepList.remove(i); } //从后向前删 for(i=sheepList.size()-1;i>0;i--){ sheepList.remove(i); }
自动写文件
// 先生成文件,然后再执行出错跟踪和输入操作。 int a; Scanner reader=new Scanner(System.in); a=reader.nextInt(); while(a){ File file=new File("D://helloworld"+i+".txt"); OutputStream outputstream=null; try{ outputstream=new FileOutputStream(file); String s="我是"+i; outputstream.write(s) } catch(IOException e){ e.printStackTrace(); } finally{ try{ file.close(); } catch(IOException e){ e.printStackTrace() } } }
实现Thread和Runnable接口的比较
//Thread和Runnable的区别: // Thread是类,在Thread中只能利用start方法实现run方法,且在执行时需要等待。 // Runnable是接口,被继承时需要重写run方法,在现实该方法时也要利用start方法,且在 // 执行时不等待 ,直接抢先执行。 public HtThread extends Thread{ private int i; public void run(){ for(i=0;i<=100;i++){ System.out.println("HtThread-->"+i); } } public HtRunnable implementsRunnable{ private int i; public void run(){ for(i=0;i<=100;i++){ System.out.println("HtRunnable-->"+i); } } public static void main(String args[]){ HtThread thread=new HtThread(); HtRunnable runnable=new HtRunnable(); thread.start(); for(int i=0;i<=100;i++){ System.out.println("test-->"+i); } //runnable.start(); }
The text was updated successfully, but these errors were encountered:
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删羊操作
自动写文件
实现Thread和Runnable接口的比较
The text was updated successfully, but these errors were encountered: