Multi-Thread 1: how to use synchronized
1. synchronized
public class TraditionalThreadSynchronize {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new TraditionalThreadSynchronize().initial();
}
private void initial(){
final Outputter outputter = new Outputter();
new Thread(new Runnable(){ //this is the first theread
public void run(){
while(true){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputter.output("aaaaaaaaaaa"); //the thread want to use outputer print a string.
}
}
}).start();
new Thread(new Runnable(){//thread two
public void run(){
while(true){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputter.output("bbbbbbbbbbbbb"); //thread two also want to use the function to print
}
}
}).start();
}
class Outputter{
public void output(String name){
int len = name.length();
for(int i= 0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
If code won't escape disturbing each other.
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new outputer.output("bbbbbbbb");
}
}
}).start();
if we use new outputer.output("bbbbbbbbb"), still won't work. since the two threads are calling different function from two different instance.So one thing is clear that we have to add synchronized key word and it should
be added to the same Instance.
same function, of the same Instance so we can change the output function to:
public synchronized void output(String name){
int len = name.length();
for(int i=0;i<len;i++){
<span style="white-space:pre"> </span>System.out.print(name.charAt(i));
}
System.out.println();
}
// Synchronized add to the function is the same as synchronized(this). the Instance is sychronized for this function
ANSWER 2:
and output3), as long as the instance is synchronized(which is also easy to do: both of the two functions should addsynchronized
key word)
public void output(String name){
int len = name.length();
synchronized (this)
{
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public synchronized void output2(String name){
int len = name.length();
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
ANSWER 3: in the case that the function is a static method
class
public void output(String name){
int len = name.length();
synchronized (Outputer.class)
{
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public synchronized void output2(String name){
int len = name.length();
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
2.Threads communicate with each other
to design the logic, so that the thread knowns when to run, and when to wait aside and let others to run.
work, are synchronized on one lock and will wait for their turn.
public class Business {
boolean subFirst = true;
public synchronized void subJob(){
while(!subFirst){
try {
this.wait(); //even though get the lock, if it's not our turn, we should wait and give back the lock.
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for(int i=0;i<10;i++){
System.out.println("sub...."+Thread.currentThread().getName()+" is running "+(i+1));
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
subFirst = false;
this.notify(); // wake other waitting threads
}
public synchronized void mainjob(){
while(subFirst){
try {
this.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for(int i=0;i<100;i++){
System.out.println("main*****"+Thread.currentThread().getName()+" is running "+(i+1));
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
subFirst = true;
this.notify();
}
}
Main class
public class TraditionalThreadCommunication {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TraditionalThreadCommunication t = new TraditionalThreadCommunication();
Business business = new Business();
t.startJob(business,50);
}
public void startJob(final Business business, final int cycles){
new Thread(new Runnable(){ //sub thread run
public void run(){
//the detail logic should all be written into Business class
for(int i=1; i<=cycles;i++)
business.subJob();
}
}).start();
new Thread(new Runnable(){ //main thread run
public void run(){
//the detail logic should be written in business class, so that the
//this class be robust, and can be easily changed in latter maintainance
for(int i=1; i<=cycles;i++)
business.mainjob();
}
}).start();
}
}
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