java学习之路 之 多线程练习题

package com.atguigu.javase.thread;

/**
 * 创建并启动一个线程的方法
 * 		1) 实现接口的方式
 * 			1) 写一个具体类, 实现Runnable接口, 并实现其中的run方法,这个run方法就是线程的入口方法
 * 			2) 创建这个类的对象, 并以这个对象为实参, 创建Thread类的对象
 * 			3) 调用Thread对象的start()方法 启动线程
 *
 */
public class HelloRunner implements Runnable {
	
	private int n;
	
	@Override
	public void run() {
		for (n = 0; n < 100; n++) {
			System.out.println(Thread.currentThread().getName() + ":" + n);
		}
	}
}

package com.atguigu.javase.thread;

public class HelloRunnerTest {
	
	public static void main(String[] args) {
		Runnable runnable = new HelloRunner();
		
		Thread thread = new Thread(runnable); // thread对象就是线程对象, 这个语句的执行相当于创建线程的栈
		//thread.run(); // 不会激活栈, 对于run方法只是一个普通方法调用
		thread.start();// 激活栈,并把run()方法压入栈底
		thread.setName("子线程1");
		/*
		Thread thread2 = new Thread(runnable);
		thread2.start();
		thread2.setName("子线程2");
		*/
		
		try {
			thread.join(); // 会引起当前线程阻塞, 直到子线程执行完毕
		} catch (InterruptedException e) {
			e.printStackTrace();
		} 
		
		Thread.currentThread().setName("主线程");
		for (int i = 0; i < 100; i++) {
			System.out.println(Thread.currentThread().getName() + ":" + i);
		}
	}
}


import org.junit.Test;

public class ThreadTest {
	
	//创建一个子线程，在线程中输出1-100之间的偶数，主线程输出1-100之间的奇数。
	@Test
	public void test() {
		Runnable print = new Print();
		Thread thread = new Thread(print);
		thread.setName("子线程---->");
		thread.start();
		
		Thread.currentThread().setName("主线程---->");
		for (int i = 0; i < 100; i++) {
			if (i % 2 != 0) {
				System.out.println(Thread.currentThread().getName() + i);
			}
		}
	}
	
	@Test
	public void test2() {
		Runnable print = new Print();
		Thread thread = new Thread(print);
		thread.setName("子线程1---->");
		thread.start();
		
		Runnable print1 = new Print1();
		Thread thread1 = new Thread(print1);
		thread1.setName("子线程2---->");
		thread1.start();
	}

}
class Print implements Runnable {

	@Override
	public void run() {
		for (int i = 0; i < 100; i++) {
			if (i % 2 == 0) {
				System.out.println(Thread.currentThread().getName() + i);
			}
		}
	}
}
class Print1 implements Runnable {

	@Override
	public void run() {
		for (int i = 0; i < 100; i++) {
			if (i % 2 != 0) {
				System.out.println(Thread.currentThread().getName() + i);
			}
		}
	}
}

package com.atguigu.javase.thread;

/**
 * 创建线程的第二种方式:
 * 		继承的方式
 * 		1) 写一个具体类继承自Thread, 重写run方法, 这个run方法是真的入口
 * 		2) 创建具体类对象, 相当于创建了Thread对象
 * 		3) 调用Thread对象的.start()
 */
class TestThread extends Thread {
	@Override
	public void run() {
		for (int i = 0; i < 100; i++) {
			System.out.println(currentThread().getName() + " : " + i);
		}
	}
}
public class ThreadTest {
	public static void main(String[] args) {
		new TestThread().start();
		for (int i = 0; i < 100; i++) {
			System.out.println(Thread.currentThread().getName() + ":" + i);
		}
	}
}


package com.atguigu.javase.thread;

public class Counter implements Runnable {
	
	private int counter = 200;

	@Override
	//public synchronized void run() {
	public void run() {
		//synchronized (this) {// 锁的粒度大
		for (int i = 0; i < 50; i++) {
			//synchronized (锁对象) { // 锁对象必须是多个线程都使用同一个对象
			synchronized (System.in) {
				// 其中的语句具有原子性
				counter -= 2;
				try {
					Thread.sleep(10);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				System.out.println(Thread.currentThread().getName() + " : " + counter);
			}
		}
	}
}

package com.atguigu.javase.thread;

public class CounterTest {

	public static void main(String[] args) {
		Counter counter = new Counter();
		
		Thread thread1 = new Thread(counter);
		thread1.setName("线程1");
		thread1.start();
		
		Thread thread2 = new Thread(counter);
		thread2.setName("线程2");
		thread2.start();
		
	}
}	

package com.atguigu.javase.thread;

import java.util.ArrayList;
import java.util.List;

// sleep方法的使用
public class DataGetter implements Runnable {
	
	private boolean forOver = false;
	
	public boolean isForOver() {
		return forOver;
	}

	public void setForOver(boolean forOver) {
		this.forOver = forOver;
	}

	@Override
	public void run() {
		List list = new ArrayList();
		for (int i = 0; i < 100; i++) {
			int rand = (int)(Math.random() * 100);
			System.out.println(rand);
			list.add(rand);
			
			int randTime = (int)(Math.random() * 200);
			try {
				Thread.sleep(randTime);
			} catch (InterruptedException e) {
				System.out.println("在小睡[" + randTime + "]时被唤醒 , 小不爽");
			}
		}
		forOver = true;
		System.out.println("要长睡30秒...");
		try {
			Thread.sleep(30 * 1000);
		} catch (InterruptedException e) {
			System.out.println("在睡30秒时被唤醒 , 很不爽");
		}
		for (int i = 0; i < list.size(); i++) {
			System.out.println(list.get(i));
		}
	}
}

package com.atguigu.javase.thread;

public class DataGetterTest {
	
	public static void main(String[] args) {
		Runnable r = new DataGetter();
		Thread thread = new Thread(r);
		thread.start();
		
		Runnable r2 = new Monitor(r, thread);
		Thread thread2 = new Thread(r2);
		thread2.start();
		
		/*
		while (!((DataGetter)r).isForOver()) {
			try {
				Thread.sleep(10);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
		thread.interrupt();
		*/
	}
}

package com.atguigu.javase.thread;

public class SleepRunner implements Runnable {

	@Override
	public void run() {
		for (int i = 0; i < 100; i++) {
			System.out.println(i);
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				System.out.println("在睡100毫秒时被打断");
			} 
		}
		System.out.println("要睡20秒");
		try {
			Thread.sleep(20 * 1000);
		} catch (InterruptedException e) {
			System.out.println("在长睡时被打断, 很不爽");
		}
		System.out.println("睡起来了...");
		
	}
}

package com.atguigu.javase.thread;

public class SleepRunnerTest {
	
	public static void main(String[] args) {
		Runnable r = new SleepRunner();
		Thread thread = new Thread(r);
		thread.start();
		
		try {
			Thread.sleep(10000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		thread.interrupt();
	}
}

package com.atguigu.javase.thread;

public class CanStopRunner implements Runnable {

	private int n = 0;
	private boolean stopFlag = false;
	
	public boolean isStopFlag() {
		return stopFlag;
	}

	public void setStopFlag(boolean stopFlag) {
		this.stopFlag = stopFlag;
	}

	@Override
	public void run() { // 不是真的入口, 真的入口永远是Thread类中的run,
		while (!stopFlag) {
			System.out.println(Thread.currentThread().getName() + " : " + n++);
			if (n == 100) {
				n = 0;
			}
		}
		System.out.println("after while...");
	}
}

package com.atguigu.javase.thread;

public class CanStopTest {
	
	public static void main(String[] args) {
		Runnable r = new CanStopRunner();
		Thread t = new Thread(r);
		t.start();
		
		for (int i = 0; i < 1000000; i++) {
			int j = i + i;
		}
		
		// 线程的停止
		//t.stop();
		((CanStopRunner)r).setStopFlag(true); //以通知的方式停止线程
	}
}

package com.atguigu.javase.thread;

public class RandomRunner implements Runnable {

	private boolean stopFlag;
	
	public boolean isStopFlag() {
		return stopFlag;
	}

	public void setStopFlag(boolean stopFlag) {
		this.stopFlag = stopFlag;
	}

	@Override
	public void run() {
		while (!stopFlag) {
			System.out.println((int)(Math.random() * 100));
		}
	}
	
}

package com.atguigu.javase.thread;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class KeyListener implements Runnable {
	
	private Runnable r;
	
	public KeyListener(Runnable r) {
		this.r = r;
	}

	@Override
	public void run() {
		InputStream is = System.in;
		InputStreamReader isr = null;
		BufferedReader bufferedReader = null;
		try {
			isr = new InputStreamReader(is);
			bufferedReader = new BufferedReader(isr);
			String line = bufferedReader.readLine();
			while (line != null) {
				// 1)
				if (line.equalsIgnoreCase("Q")) {
					((RandomRunner)r).setStopFlag(true);
					//break;
				}
				// 2)
				line = bufferedReader.readLine();
			}
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			try {
				bufferedReader.close();
			} catch (Exception e2) {
				// TODO: handle exception
			}
		}
	}

}

package com.atguigu.javase.thread;

public class RandomRunnerTest {
	
	//在main方法中创建并启动1个线程。线程循环随机打印100以内的整数，直到主线程从键盘读取了“Q”命令。
	//在main方法中创建并启动两个线程。第一个线程循环随机打印100以内的整数，直到第二个线程从键盘读取了“Q”命令。

	public static void main(String[] args) {
		Runnable r = new RandomRunner();
		Thread t = new Thread(r);
		t.start();
		
		Runnable r2 = new KeyListener(r);
		Thread t2 = new Thread(r2);
		t2.setDaemon(true);
		t2.start();
		
		/*
		InputStream is = System.in;
		InputStreamReader isr = null;
		BufferedReader bufferedReader = null;
		try {
			isr = new InputStreamReader(is);
			bufferedReader = new BufferedReader(isr);
			String line = bufferedReader.readLine();
			while (line != null) {
				// 1)
				if (line.equalsIgnoreCase("Q")) {
					((RandomRunner)r).setStopFlag(true);
					break;
				}
				// 2)
				line = bufferedReader.readLine();
			}
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			try {
				bufferedReader.close();
			} catch (Exception e2) {
				// TODO: handle exception
			}
		}
		*/
	}
}


package com.atguigu.javase.thread;
// 创建一个账户类 ，实现取钱与存钱的同步操作
public class Account {
	
	private String name;
	private int balance;
	
	public Account() {
	}
	public Account(String name, int balance) {
		super();
		this.name = name;
		this.balance = balance;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getBalance() {
		return balance;
	}
	public void setBalance(int balance) {
		this.balance = balance;
	}
	@Override
	public String toString() {
		return "Account [name=" + name + ", balance=" + balance + "]";
	}
}

package com.atguigu.javase.thread;
// 存钱操作的处理
public class Deposit implements Runnable {
	
	private Account account;
	
	public Deposit(Account account) {
		this.account = account;
	}
	
	@Override
	public void run() {
		for (;;) {
			synchronized ("") {
				int rand = (int)(Math.random() * 1000);
				account.setBalance(account.getBalance() + rand);
				System.out.println("存钱[" + rand + "]后" + ":" + account);
				
				"".notifyAll();
			}
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

package com.atguigu.javase.thread;
// 取钱操作的处理
public class Withdraw implements Runnable {
	
	private Account account;
	
	public Withdraw(Account account) {
		this.account = account;
	}
	
	@Override
	public void run() {
		for (;;) {
			synchronized ("") {
				int rand = (int)(Math.random() * 100);
				while (rand > account.getBalance()) {
					try {
						"".wait();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				account.setBalance(account.getBalance() - rand);
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				System.out.println("取钱[" + rand + "]后:" + account);
			}
		}
	}

}

package com.atguigu.javase.thread;


public class AccountTest {
	
	public static void main(String[] args) {
		Account account = new Account("张三", 1000);
		
		Runnable runnable1 = new Deposit(account);
		Runnable runnable2 = new Withdraw(account);
		
		Thread t1 = new Thread(runnable1);
		Thread t2 = new Thread(runnable2);
		t2.start();
		t1.start();
	}
}

package com.atguigu.javase.thread;
// notify方法的使用
public class PrintNumberRunner implements Runnable {

	private int i = 0;
	
	@Override
	public void run() {
		for (;;) {
			synchronized ("") {
				"".notify(); // 必须是锁对象调用, 并且必须和wait方法的锁是同一把锁 并且此方法调用必须处于synchronized块中
				if (i == 100) {
					break;
				}
				i++;
				System.out.println(Thread.currentThread().getName() + " : " + i);
				try {
					"".wait(); // 必须是锁对象调用, 并且此方法调用必须处于synchronized块中
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}
	
	public static void main(String[] args) {
		Runnable runnable = new PrintNumberRunner();
		Thread thread1 = new Thread(runnable);
		Thread thread2 = new Thread(runnable);
		thread1.start();
		thread2.start();
	}

}

package com.atguigu.javase.thread;

public class TestDeadLock {
	// 死锁实例
	static StringBuffer s1 = new StringBuffer();
	static StringBuffer s2 = new StringBuffer();

	public static void main(String[] args) {
		new Thread() {
			public void run() {
				synchronized (s1) {
					s2.append("A");
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					synchronized (s2) {
						s2.append("B");
						System.out.print(s1);
						System.out.print(s2);
					}
				}
			}
		}.start();
		new Thread() {
			public void run() {
				synchronized (s2) {
					s2.append("C");
					synchronized (s1) {
						s1.append("D");
						System.out.print(s2);
						System.out.print(s1);
					}
				}
			}
		}.start();
	}
}