JAVA Study Notes - common function module code

多线程

package pack1;

class RunnableDemo implements Runnable {
    private Thread t;
    private String threadName;

    RunnableDemo(String name) {
        threadName = name;
        System.out.println("Creating " + threadName);
    }

    public void run() {
        System.out.println("Running " + threadName);
        try {
            for (int i = 4; i > 0; i--) {
                System.out.println("Thread: " + threadName + ", " + i);
                // 让线程睡眠一会
                Thread.sleep(50);
            }
        } catch (InterruptedException e) {
            System.out.println("Thread " + threadName + " interrupted.");
        }
//        System.out.println("Thread " + threadName + " exiting.");
    }

    public void start() {
//        System.out.println("Starting " + threadName);
//        if (t == null) {
            t = new Thread(this, threadName);
            t.start();
//        }
    }
}

public class TestThread {

    public static void main(String args[]) {
        RunnableDemo R1 = new RunnableDemo("Thread-1");
        R1.start();

        RunnableDemo R2 = new RunnableDemo("Thread-2");
        R2.start();
    }
}

文件写入内容

the java.io. * Import; 

public class the WriteFile { 
    public static void main (String [] args) { 
        the try { 
            BufferedWriter, new new BufferedWriter, OUT = (new new FileWriter ( "runoob.txt")); 
　　　　　　　　// if additional data, then the file later add a name parameter to true 
            out.write ( "novice tutorial"); 
            the out.close (); 
            ( "successfully created file!") System.out.println; 
        } the catch (IOException E) { 
        } 
    } 
} 

reading document content

import java.io.*;

public class WriteFile {
    public static void main(String[] args)  {
        try {
            BufferedReader in = new BufferedReader(new FileReader("test.log"));
            String str;

            while ((str = in.readLine()) != null) {
                System.out.println(str);
            }
            System.out.println(str);
        } catch (IOException e) {
        }
    }
}

More common module functions https://www.runoob.com/java/java-examples.html