第九章 Java多线程机制 05_线程同步_4

public class TT  {
private int b = 100;

public synchronized void m1() throws Exception {
b = 1000;
Thread.sleep(5000);
System.out.println("b = " + b);
}
public void m2() {
System.out.println(b);
}
}

// TT.java

public class TT implements Runnable {
private int b = 100;

public synchronized void m1() throws Exception {
b = 1000;
Thread.sleep(5000);
System.out.println("b = " + b);
}

public void m2() {
System.out.println(b);
}

public void run() {
try
{
m1();
}
catch (Exception e)
{
e.printStackTrace();
}
}

public static void main(String args[]) throws Exception {
TT tt = new TT();
Thread t = new Thread(tt);
t.start();

Thread.sleep(1000);
tt.m2();
}

}