单项选择题

A.Compilation fails.B.Nothing is added to the file syst……

Given that the current directory is empty, and that the user has read and write privileges to the current, and the following:

Which statement is true?（）

A.Compilation fails.
B.Nothing is added to the file system.
C.Only a new file is created on the file system.
D.Only a new directory is created on the file system.
E.Both a new file and a new directory are created on the file system.

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单项选择题Given: What is the result?（）

A.true true
B.false true
C.true false
D.false false
E.Compilation fails.
F. An exception is thrown at runtime.

单项选择题Given: What is the output?（）

A.42
B.420
C.462
D.42042
E.Compilation fails.
F.An exception is thrown at runtime.

多项选择题Given: Which two can be results?（）

A. java.lang.RuntimeException: Problem
B. run.java.lang.RuntimeException: Problem
C. End of method.java.lang.RuntimeException: Problem
D. End of method.run.java.lang.RuntimeException: Problem
E. run.java.lang.RuntimeException: Problem End of method.

多项选择题Given: Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?（）

A.move the line 12 print statement into the foo() method
B.change line 7 to public synchronized void go() {
C.change the variable declaration on line 2 to private volatile int x;
D.wrap the code inside the foo() method with a synchronized( this ) block
E.wrap the for loop code inside the go() method with a synchronized block synchronized(this){ //for loop code here }

单项选择题Click the Exhibit button. What is the output if the main() method is run?（）

A.4
B.5
C.8
D.9
E.Compilation fails.
F.An exception is thrown at runtime.
G.It is impossible to determine for certain.