Transcription

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10 start() run()

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12 class SumThread extends Thread int end; int sum; SumThread( int end ) this.end = end; public void run() // sum integers 1, 2,..., end // and set the sum

13 SumThread t = new SumThread( 150 ); t.start(); run() obj t t run()obj run()

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15 class SumRun implements Runnable int end; int sum; SumRun(int end) this.end = end; public void run() // sum integers 1, 2,..., end // set sum

16 SumRun srun = new SumRun(150); Thread sumrunthread = new Thread(srun); sumrunthread.start(); public class MyRunnable implements Runnable public void run() go(); public void go() domore(); public void domore() System.out.println("top o' the stack");

17 public class MyRunnable implements Runnable public void run() go(); public void go() domore(); public void domore() System.out.println("top o' the stack"); public class MyRunnable implements Runnable public void run() go(); public void go() domore(); public void domore() System.out.println("top o' the stack");

18 public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main"); public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

19 public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main"); public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

20 public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

21 public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

22 public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

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25 set/getpriority MIN_PRIORITY, MAX_PRIORITY, NORM_PRIORITY Thread.sleep(2000)

26 try Thread.sleep(2000); catch (InterruptedException ex) ex.printstacktrace();

27 public class MyRunnable implements Runnable public void run() go(); public void go() try Thread.sleep(2000); catch(interruptedexception ex) ex.printstacktrace(); domore(); public void domore() System.out.println("top o' the stack"); public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunnable(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main");

28 % java ThreadTester back in main top o' the stack % java ThreadTester back in main top o' the stack % java ThreadTester back in main top o' the stack % java ThreadTester back in main top o' the stack

29 public class Worker extends Thread private sometype result; public void run() // Performs very long computation and sets result public static void main(string[] args) Thread wt = new Worker(); wt.start(); while (wt.isalive()); System.out.println(result);

30 sleep() sleep() sleep(long n) sleep()thread sleep()

31 sleep() public class Worker extends Thread private sometype result; public void run() // Performs very long computation and sets result public static void main(string[] args) Thread wt = new Worker(); wt.start(); while (wt.isalive()) try Thread.sleep(800); // sleep for 800 msec catch (InterruptedException e)... System.out.println(result);

32 yield() yield()thread yield() sleep(800)yield() tryyield() yield()

33 join() sleep()yield() tr.join() rtr join(long n)tn join()interruptedexception while join(). public class Worker extends Thread private sometype result; public void run() // Performs very long computation and sets result public static void main(string[] args) Thread wt = new Worker(); wt.start(); try wt.join(); // wait for wt to terminate catch (InterruptedException e )... System.out.println(result);

34 public class MyRunner implements Runnable public void run() System.out.println("This is great"); Thread.yield(); go(); public void go() public class ThreadTester public static void main(string[] args) Runnable threadjob = new MyRunner(); Thread mythread = new Thread(threadJob); mythread.start(); System.out.println("back in main"); System.out.println("having fun");

35 public class MyRunner implements Runnable public class ThreadTester public void run() System.out.println("This is great"); Thread.yield(); go(); public void go() System.out.println("having fun"); public static void main(string[] args) Runnable threadjob = new MyRunner(); Thread mythread = new Thread(threadJob); mythread.start(); try mythread.join(); catch (InterruptedException ex) System.out.println("back in main");

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43 public synchronized void push(object item) // code for the method goes here

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45 public class BadBuffer private int currentitem; private boolean full = false; public void add( int item )

46 remove()

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48 public void withdraw(double amount) balancechangelock.lock(); try while (balance < amount)... finally balancechangelock.unlock();

49 public class BankAccount private Lock balancechangelock; private Condition sufficientfundscondition; private int balance; public BankAccount() balancechangelock = new ReentrantLock(); SufficientFundsCondition = balancechangelock.newcondition(); public void withdraw(double amount) balancechangelock.lock(); try while (balance < amount) sufficientfundscondition.await(); catch (InterruptedException ex) finally balancechangelock.unlock();

50 public void withdraw(double amount) balancechangelock.lock(); try while (balance < amount) sufficientfundscondition.await(); catch (InterruptedException ex) finally balancechangelock.unlock(); public void deposit(double amount) balancechangelock.lock(); try... sufficientfundscondition.signalall(); finally balancechangelock.unlock();

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53 public Thread() Allocates a new Thread object public Thread(Runnable target) public final boolean isalive()tests if this thread is alive public static Thread currentthread() public final String getname() public final void setname(string name) public final int getpriority() public final void setpriority(int newpriority) public void start() Causes thread to be scheduled; JVM calls its run() method public void run()if thread was constructed using a separate Runnable object, then that Runnable object's run method is called; otherwise, this method does nothing. public void interrupt() public final void join() public static void sleep(long millis) public static void yield()