我遇到了与Synchronized不符合我的预期的问题,我尝试使用volatile关键字:
共享对象:
public class ThreadValue {
private String caller;
private String value;
public ThreadValue( String caller, String value ) {
this.value = value;
this.caller = caller;
}
public synchronized String getValue() {
return this.caller + " " + this.value;
}
public synchronized void setValue( String caller, String value ) {
this.caller = caller;
this.value = value;
}
}
线程 1:
class CongoThread implements Runnable {
private ThreadValue v;
public CongoThread(ThreadValue v) {
this.v = v;
}
public void run() {
for (int i = 0; i 10; i++) {
v.setValue( "congo", "cool" );
v.getValue();
}
}
}
线程 2:
class LibyaThread implements Runnable {
private ThreadValue v;
public LibyaThread(ThreadValue v) {
this.v = v;
}
public void run() {
for (int i = 0; i 10; i++) {
v.setValue( "libya", "awesome" );
System.out.println("In Libya Thread " + v.getValue() );
}
}
}
调用类:
class TwoThreadsTest {
public static void main (String args[]) {
ThreadValue v = new ThreadValue("", "");
Thread congo = new Thread( new CongoThread( v ) );
Thread libya = new Thread( new LibyaThread( v ) );
libya.start();
congo.start();
}
}
偶尔会出现"In Libya Thread congo cool"这样的错误,这是不应该出现的。我期望的是: "In Libya Thread libya awesome" "In Congo Thread congo cool"。 我不希望它们混合在一起。