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Copy pathThreadOrderRun4.java
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302 lines (261 loc) · 8 KB
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package thread;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
/**
* @Author: wei1
* @Date: Create in 2018/10/11 20:47
* @Description: 有四个线程1、2、3、4。线程1的功能就是输出1，线程2的功能就是输出2，以此类推。
* 现在有四个文件ABCD。初始都为空。现要让四个文件呈如下格式：
* A. 1 2 3 4 1 2....
* B. 2 3 4 1 2 3....
* C. 3 4 1 2 3 4....
* D. 4 1 2 3 4 1....
* 请设计程序。
* 4个线程同时执行，每个负责向文件输出1 2 3 4
* 就是线程1向Ａ B C D 四个文件输出1
* 就是线程2向Ａ B C D 四个文件输出2
* 就是线程3向Ａ B C D 四个文件输出3
* 就是线程4向Ａ B C D 四个文件输出4
* 开始就是用Reentrant的一个锁对应多个condition来控制流程，但是这样是一个线程在写，3个在等没有意义
* 现在发现这个是有执行顺序的,注意每个IO完成的时间都不一样，注意sleep一会
* 线程1： A -> D -> C -> B
* 线程2： B -> A -> D -> C
* 线程3： C -> B -> A -> D
* 线程4： D -> C -> B -> A
*/
public class ThreadOrderRun4 {
File fileA = new File("A.txt");
File fileB = new File("B.txt");
File fileC = new File("C.txt");
File fileD = new File("D.txt");
FileWriter fwA;
FileWriter fwB;
FileWriter fwC;
FileWriter fwD;
volatile int fileAid = 1;
volatile int fileBid = 2;
volatile int fileCid = 3;
volatile int fileDid = 4;
CountDownLatch start = new CountDownLatch(1);
public ThreadOrderRun4() throws IOException {
//初始化创建文件A Ｂ C D
if (fileA.exists() || fileB.exists() || fileC.exists() || fileD.exists()) {
fileA.delete();
fileB.delete();
fileC.delete();
fileD.delete();
}
fileA.createNewFile();
fileB.createNewFile();
fileC.createNewFile();
fileD.createNewFile();
fwA = new FileWriter(fileA);
fwB = new FileWriter(fileB);
fwC = new FileWriter(fileC);
fwD = new FileWriter(fileD);
}
private void firstRun(String str) throws IOException, InterruptedException {
start.await();
while (true) {
// try {
// lock1.lock();
// if (lock1id != 1) {
// condition11.await();
// }
// fileWriter("fileA", "1 ");
// lock1id = 2;
// condition12.signal();
// } catch (IOException e) {
// e.printStackTrace();
// } finally {
// lock1.unlock();
// }
while (fileAid != 1) {
}
synchronized (fileA) {
fileWriter("fileA", str);
fileAid = 2;
}
while (fileDid != 1) {
}
synchronized (fileD) {
fileWriter("fileD", str);
fileDid = 2;
}
while (fileCid != 1) {
}
synchronized (fileC) {
fileWriter("fileC", str);
fileCid = 2;
}
while (fileBid != 1) {
}
synchronized (fileB) {
fileWriter("fileB", str);
fileBid = 2;
}
}
}
private void secondRun(String str) throws IOException, InterruptedException {
start.await();
while (true) {
while (fileBid != 2) {
}
synchronized (fileB) {
fileWriter("fileB", str);
fileBid = 3;
}
while (fileAid != 2) {
}
synchronized (fileA) {
fileWriter("fileA", str);
fileAid = 3;
}
while (fileDid != 2) {
}
synchronized (fileD) {
fileWriter("fileD", str);
fileDid = 3;
}
while (fileCid != 2) {
}
synchronized (fileC) {
fileWriter("fileC", str);
fileCid = 3;
}
}
}
private void thirdRun(String str) throws IOException, InterruptedException {
start.await();
while (true) {
while (fileCid != 3) {
}
synchronized (fileC) {
fileWriter("fileC", str);
fileCid = 4;
}
while (fileBid != 3) {
}
synchronized (fileB) {
fileWriter("fileB", str);
fileBid = 4;
}
while (fileAid != 3) {
}
synchronized (fileA) {
fileWriter("fileA", str);
fileAid = 4;
}
while (fileDid != 3) {
}
synchronized (fileD) {
fileWriter("fileD", str);
fileDid = 4;
}
}
}
private void fourthRun(String str) throws IOException, InterruptedException {
start.await();
while (true) {
while (fileDid != 4) {
}
synchronized (fileD) {
fileWriter("fileD", str);
fileDid = 1;
}
while (fileCid != 4) {
}
synchronized (fileC) {
fileWriter("fileC", str);
fileCid = 1;
}
while (fileBid != 4) {
}
synchronized (fileB) {
fileWriter("fileB", str);
fileBid = 1;
}
while (fileAid != 4) {
}
synchronized (fileA) {
fileWriter("fileA", str);
fileAid = 1;
}
}
}
private void fileWriter(String fileName, String str) throws IOException {
if (fileName == null) {
return;
}
if (fileName.equals("fileA")) {
fwA.write(str);
fwA.flush();
}
if (fileName.equals("fileB")) {
fwB.write(str);
fwB.flush();
}
if (fileName.equals("fileC")) {
fwC.write(str);
fwC.flush();
}
if (fileName.equals("fileD")) {
fwD.write(str);
fwD.flush();
}
}
public static void main(String[] args) throws IOException {
ThreadOrderRun4 threadOrderRun4 = new ThreadOrderRun4();
new Thread(new Runnable() {
@Override
public void run() {
try {
threadOrderRun4.firstRun("1 ");
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
try {
threadOrderRun4.secondRun("2 ");
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
try {
threadOrderRun4.thirdRun("3 ");
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
try {
threadOrderRun4.fourthRun("4 ");
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
threadOrderRun4.start.countDown();
}
}