多线程代码如下：请完成magic 方法，使其执行顺序如下图：
代码如下：
public class Blackhole {
public static void enter(Object obj){System.out.println("Step 1");
magic(obj);
System.out.println("Step 2");
synchronized (obj) {
System.out.println(obj);
System.out.println("Step 3 (never reached hear)");
}
}
public static void magic(final Object obj){
}
public static void main(String[] args) {
System.out.println("BEGIN");
final Object obj=new Object();
Blackhole.enter(obj);
}
}
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答案：
public static void magic(final Object obj){
Thread thread=new Thread(){
public void run() {
synchronized (obj) {
synchronized (this) {
this.setName("locked");
this.notifyAll();
}
while(true);
}
};
};
synchronized (thread) {
thread.setName("");
thread.start();
while(thread.getName().equals("")){
try {
thread.wait();
} catch (Exception e) {
}
}
}
}
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