Cap Programming with multiple threads-javaTutorial-php.cn

Cap Programming with multiple threads

Mary-Kate Olsen

Release： 2024-11-22 05:38:17

Original

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Main skills and concepts
• Understand the fundamentals of creating multiple threads
• Know the Thread class and the Runnable
interface • Create a thread
• Create multiple threads
• Determine when a thread ends
• Use thread priorities
• Understand thread synchronization
• Use synchronized methods
• Use synchronized blocks
• Promote communication between threads
• Suspend, resume and stop threads

Threads: These are independent paths of execution within a program.
Multitasking: It can be based on processes (several programs) or threads (several tasks in the same program).
Advantages:
Greater efficiency when using idle time.
Better use of multicore/multiprocessor systems.

Thread Creation and Management

Classes and Interfaces:
Thread: Class that encapsulates threads.
Runnable: Interface used to define custom threads.

Common Thread Class Methods:

getName(): Returns the name of the thread.
getPriority(): Returns the priority.
isAlive(): Checks if the thread is still executing.
join(): Waits for the thread to finish.
run(): Defines the entry point of the thread.
sleep(long ms): Suspends the thread for a period of time.
start(): Starts thread execution.

Creating Threads:

Implementing Runnable:

class MyThread implements Runnable {
    String threadName;

    MyThread(String name) {
        threadName = name;
    }

    public void run() {
        System.out.println(threadName + " starting.");
        try {
            for (int i = 0; i < 10; i++) {
                Thread.sleep(400);
                System.out.println("In " + threadName + ", count is " + i);
            }
        } catch (InterruptedException e) {
            System.out.println(threadName + " interrupted.");
        }
        System.out.println(threadName + " terminating.");
    }
}

public class UseThreads {
    public static void main(String[] args) {
        System.out.println("Main thread starting.");

        MyThread myThread = new MyThread("Child #1");
        Thread thread = new Thread(myThread);
        thread.start();

        for (int i = 0; i < 50; i++) {
            System.out.print(".");
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                System.out.println("Main thread interrupted.");
            }
        }
        System.out.println("Main thread ending.");
    }
}

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Expected output:

Main thread starting.
.
Child #1 starting.
..
In Child #1, count is 0
...
In Child #1, count is 1
...
Main thread ending.

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Thread Class Extension:

class MyThread extends Thread {
    MyThread(String name) {
        super(name);
    }

    public void run() {
        System.out.println(getName() + " starting.");
        try {
            for (int i = 0; i < 10; i++) {
                Thread.sleep(400);
                System.out.println("In " + getName() + ", count is " + i);
            }
        } catch (InterruptedException e) {
            System.out.println(getName() + " interrupted.");
        }
        System.out.println(getName() + " terminating.");
    }
}

public class UseThreads {
    public static void main(String[] args) {
        System.out.println("Main thread starting.");

        MyThread thread = new MyThread("Child #1");
        thread.start();

        for (int i = 0; i < 50; i++) {
            System.out.print(".");
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                System.out.println("Main thread interrupted.");
            }
        }
        System.out.println("Main thread ending.");
    }
}

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note: The sleep() method makes the thread in which it is called suspend execution
for the specified period of milliseconds.

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Cap Programação com várias threads

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