
/** *//**
* 演示一个线程写数据的同时另一个线程读取数据时的同步问题
*
* @author midi13
* @since 2006
*
*/
public class SynTest ...{
private String firstName, lastName;

private synchronized String getName() ...{
String result = firstName + " " + lastName;
return result;
}

private synchronized void setName(String firstName, String lastName) ...{
print("entering setName");
this.firstName = firstName;
print("Set first name have done firstName=" + this.firstName);
try ...{
Thread.sleep(1000);
} catch (InterruptedException e) ...{
}
this.lastName = lastName;
print("set last name have done,and leave setName() method.firstName="
+ this.firstName + " lastName=" + this.lastName);
}

private static void print(String msg) ...{
String thread = Thread.currentThread().getName();
System.out.println(thread + ": " + msg);
}

public static void main(String[] args) ...{
// 必需声明为final,否则runnable里面的run()方法不能访问。
final SynTest test1 = new SynTest();
// 设置初始值
test1.setName("arzu", "guli");

Runnable run1 = new Runnable() ...{
public void run() ...{
test1.setName("kang", "midi");
}
};
// 修改名字线程
Thread threadOne = new Thread(run1, "threadOne");
threadOne.start();

try ...{
Thread.sleep(200);
} catch (InterruptedException e) ...{
}

Runnable run2 = new Runnable() ...{
public void run() ...{
print("读取" + test1.getName());
}
};
// 读取名字线程
Thread threadTwo = new Thread(run2, "threadTwo");
threadTwo.start();
System.out.println("main() exit");
}
}
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