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Making QR Code ISO/IEC18004 in Java Multithreading

CHAPTER 10 Multithreading
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NOTE: If a variable is assigned by one thread and is used or assigned by other threads, all access to the variable should be enclosed in a synchronized method or a synchronized statement
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(Bob(Mary) ) class Parentheses { void display(String s) { Systemoutprint ("(" + s); try { Threadsleep (1000); } catch (InterruptedException e) { Systemoutprintln ("Interrupted"); } Systemoutprintln(")"); } } class MyThread implements Runnable { String s1; Parentheses p1; Thread t; public MyThread (Parentheses p2, String s2) { p1= p2; s1= s2; t = new Thread(this); tstart(); } public void run() { p1display(s1); } } class Demo{ public static void main (String args[]) { Parentheses p3 = new Parentheses(); MyThread name1 = new MyThread(p3, "Bob"); MyThread name2 = new MyThread(p3, "Mary"); try { name1tjoin(); name2tjoin(); } catch (InterruptedException e ) { Systemoutprintln( "Interrupted"); } } }
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The problem with the previous example is that two threads use the same resource concurrently The resource is the display() method defined in the Parentheses class In order to have one thread take control of the display() method, we must synchronize the display() method This is done by using the keyword synchronized in the header of the display() method, which is illustrated in the next example Here s what is displayed when you run the next example This is what you expected to see in the previous example
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(Bob) (Mary) class Parentheses { synchronized void display(String s) { Systemoutprint ("(" + s); try { Threadsleep (1000); } catch (InterruptedException e) { Systemoutprintln ("Interrupted"); } Systemoutprintln(")"); } } class MyThread implements Runnable { String s1; Parentheses p1; Thread t; public MyThread (Parentheses p2, String s2) { p1= p2; s1= s2; t = new Thread(this); tstart(); } public void run() { p1display(s1); } } class Demo{ public static void main (String args[]) { Parentheses p3 = new Parentheses(); MyThread name1 = new MyThread(p3, "Bob"); MyThread name2 = new MyThread(p3, "Mary"); try {
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CHAPTER 10 Multithreading
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name1tjoin(); name2tjoin(); } catch (InterruptedException e ) { Systemoutprintln( "Interrupted"); } } }
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Synchronizing a method is the best way to restrict the use of a method one thread at a time However, there will be occasions when you won t be able to synchronize a method, such as when you use a class that is provided to you by a third party In such cases, you don t have access to the definition of the class, which prevents you from using the synchronized keyword An alternative to using the synchronized keyword is to use the synchronized statement A synchronized statement contains a synchronized block, within which is placed objects and methods that are to be synchronized Calls to the methods contained in the synchronized block happen only after the thread enters the monitor of the object Although you can call methods within a synchronized block, the method declaration must be made outside a synchronized block The following example shows how to use a synchronized statement This is basically the same as the previous example; however, the synchronized statement is used instead of the synchronized keyword The synchronized statement is placed in the run() method within the MyThread class The synchronized statement synchronizes the instance of the Parentheses class and thus prevents two threads from calling the display() method concurrently
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class Parentheses { void display(String s) { Systemoutprint ("(" + s); try { Threadsleep (1000); } catch (InterruptedException e) { Systemoutprintln ("Interrupted"); } Systemoutprintln(")"); } } class MyThread implements Runnable { String s1;
Parentheses p1; Thread t; public MyThread (Parentheses p1= p2; s1= s2; t = new Thread(this); tstart(); } public void run() { synchronized(p1){ p1display(s1); } }
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p2, String s2) {
} class Demo{ public static void main (String args[]) { Parentheses p3 = new Parentheses(); MyThread name1 = new MyThread(p3, "Bob"); MyThread name2 = new MyThread(p3, "Mary"); try { name1tjoin(); name2tjoin(); } catch (InterruptedException e ) { Systemoutprintln( "Interrupted"); } } }
Here, the display() method is not modified by synchronized Instead, the synchronized statement is used inside the caller s run() method This causes the same correct output as before, because each thread waits for the prior one to finish before proceeding
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