单选题public class TestSeven extends Thread { private static int x； public synchronized void doThings（） { int current = x； current++； x = current； } public void run（） { doThings（）； } } Which is true？（）A
Compilation fails.B
An exception is thrown
题目
单选题
public class TestSeven extends Thread { private static int x； public synchronized void doThings（） { int current = x； current++； x = current； } public void run（） { doThings（）； } } Which is true？（）
A
Compilation fails.
B
An exception is thrown at runtime.
C
Synchronizing the run（） method would make the class thread-safe.
D
The data in variable “x” are protected from concurrent access problems.
E
Declaring the doThings（） method as static would make the class thread-safe.
F
Wrapping the statements within doThings（） in a synchronized（new Object（）） {} block would make the class thread-safe.
