UUID是1.5中新增的一个类，在java.util下，用它可以产生一个号称全球唯一的ID
import java.util.UUID;
public class Test {
public static void main(String[] args) {
UUID uuid = UUID.randomUUID();
System.out.println (uuid);
}
}
编译运行输出：
07ca3dec-b674-41d0-af9e-9c37583b08bb
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考考你（28）
Given this code snippet：
try {
tryThis();
return;
} catch(IOException x1) {
System.out.println("exception 1");
return;
} catch(Exception x2) {
System.out.println("exception 2");
return;
} finally {
System.out.println("finally");
}
what will appear in the standard output if tryThis() throws a IOException?
a. "exception 1" followed by "finally"
b. "exception 2" followed by "finally"
c. "exception 1"
d. "exception 2"
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