[ J2SE ] 排号程序

最新推荐文章于 2021-11-27 11:17:17 发布

最新推荐文章于 2021-11-27 11:17:17 发布 · 121 阅读

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本文展示了一个使用Java进行同步文件读写的示例程序。该程序通过创建线程并发地生成并记录递增的整数到文件中。通过使用同步方法确保了线程安全，并演示了如何使用DataInputStream和DataOutputStream进行基本的文件I/O操作。

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import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;
import java.util.Vector;

public class Numbers implements Runnable {

private static int baseNumber;

private List<Integer> numberList;

private String path = "e:/number.txt";

public Numbers() {
  // 构建一个
  this.numberList = new Vector<Integer>();
  this.CheckFile();
  try {
   DataInputStream read = new DataInputStream(new FileInputStream(
     this.path));
   baseNumber = read.readInt();
   read.close();
  } catch (Exception ex) {
   ex.printStackTrace();
  }
}

private void CheckFile() {
  try {
   File file = new File(this.path);
   if (!file.exists()) {
    file.createNewFile();
    DataOutputStream write = new DataOutputStream(
      new FileOutputStream(this.path));
    write.writeInt(0);
    write.close();
   }
  } catch (Exception ex) {
   ex.printStackTrace();
  }
}

public synchronized void getNumber() {
  try {
   baseNumber++;
   this.numberList.add(baseNumber);
   DataOutputStream write = new DataOutputStream(new FileOutputStream(
     this.path, false));
   write.writeInt(baseNumber);
   write.close();

  } catch (Exception ex) {
   ex.printStackTrace();
  }
}

private void ShowNumber() {
  for (int i = 0; i < numberList.size(); ++i) {
   int num = numberList.get(i).intValue();
   System.out.print(num + "\t");
  }
  System.out.print("\n");
}

public void run() {
  for (int i = 0; i < 10; ++i) {
   getNumber();
  }
  this.ShowNumber();
}

public static void main(String[] args) {
  Thread t1 = new Thread(new Numbers());
  Thread t2 = new Thread(new Numbers());
  t1.start();
  t2.start();
}

}