单项选择题X 纠错

A. Foo has the value of “”
B. Foo has the value of null.
C. Foo has the value of “blue”
D. Foo has the value of “green”
E. An exception is thrown.
F. The code will not compile.

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A. Char ch = “a”;
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C. Char ch = ‘cafe‘;
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E. Char ch = ‘“ucafe‘;
F. Char ch = ‘“u10100‘;
G. Char ch = (char) true;

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A. The code compiles and “s=” is printed.
B. The code compiles and “s=null” is printed.
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A. Final int k = 4;
B. Public int k = 4;
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E. Abstract int k = 4;
F. Volatile int k = 4;
G. Transient int k = 4;
H. Protected int k = 4;

单项选择题

A.  Foo has the value “”
B. Foo has the value null
C. An exception is thrown
D. The code will not compile

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A. false
B. default
C. _object
D. a-class

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A. New BufferedInputStream(“in.txt”);
B. New BufferedInputStream(new File(“in.txt”));
C. New BufferedInputStream(Writer(“in.txt”));
D. New BufferedInputStream(new Writer(“in.txt”));
E. New BufferedInputStream(new InputStream(“in.txt”));
F. New BufferedInputStream(new FileInputStream(“in.txt”));

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A. OutputStream out=new FileOutputStream(“file.txt”);
B. OutputStream out=new FileOutputStream(“file.txt”, “append”);
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D. FileOutputStream out=new FileOutputStream(new file(“file.txt”));
E. OutputStream out=new FileOutputStream(new File(“file.txt”)true);

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A. InputStream in=new FileReader(“file.txt”);
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