1. 知识点
实现线程非常简单，通过继承Thread类即可，继承后的run()方法会在单独的线程中跑。
2. 实现
通过继承Thread实现一个线程，功能是往文件中写点东西。
package org.maoge.thread; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; /** * 写文件线程 */ public class WriteFileThread extends Thread { private String fileName; public WriteFileThread(String filename) { this.fileName = filename; } @Override public void run() { byte buffer[] = new byte[1000000]; OutputStream out = null; try { out = new FileOutputStream(fileName); out.write(buffer, 0, buffer.length); System.out.println("[" + fileName + "]-endTime:" + System.currentTimeMillis()); } catch (Exception ex) { System.out.println(ex.toString()); } finally { try { out.close(); } catch (IOException ioEx) { System.out.println(ioEx.toString()); } } } }
3. 测试
/** * 写文件测试 */ public class WriteFileTest { public static void main(String[] args) { System.out.println("startTime:" + System.currentTimeMillis()); for (int i = 0; i < 10; i++) { WriteFileThread writeFile = new WriteFileThread("D:\\temp\\" + (i + 500) + ".txt"); writeFile.start(); } } }
运行结果如下，注意观察能发现，不是开始的早就结束的早。
startTime:1586956308113 [D:\temp\500.txt]-endTime:1586956308116 [D:\temp\501.txt]-endTime:1586956308116 [D:\temp\502.txt]-endTime:1586956308116 [D:\temp\506.txt]-endTime:1586956308117 [D:\temp\505.txt]-endTime:1586956308119 [D:\temp\504.txt]-endTime:1586956308120 [D:\temp\507.txt]-endTime:1586956308120 [D:\temp\503.txt]-endTime:1586956308120 [D:\temp\508.txt]-endTime:1586956308121 [D:\temp\509.txt]-endTime:1586956308121
