Multi Thread Write Example

java

import java.io.FileWriter;
import java.io.IOException;

public class FileWriterExample2 {

    public static void main(String[] args) throws IOException, InterruptedException {
        FileWriter fw = new FileWriter("/tmp/test", true);
        FileWriter fw2 = new FileWriter("/tmp/test", true);
        char[] chars = new char[1024 * 1024 * 4];
        for (int i = 0; i < 4 * 1024 * 1024; i++) {
            chars[i] = (char) 'a';
        }
        char[] chars1 = new char[4 * 1024 * 1024];
        for (int i = 0; i < 4 * 1024 * 1024; i++) {
            chars1[i] = (char) 'b';
        }
        for (int i = 0; i < 10; i++) {
            Thread thread1 = new Thread(() -> {
                try {
                    fw.write(chars);
                    fw.write("hello\n");
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            Thread thread2 = new Thread(() -> {
                try {
                    fw.write(chars1);
                    fw.write("world\n");
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            thread1.join();
            thread2.join();
            thread1.start();
            thread2.start();
        }
        fw.close();
        fw2.close();
    }
}