单项选择题X 纠错
A.The equals method does NOT properly override the Object.equals method.
B.Compilation fails because the private attribute p.name cannot be accessed in line 5.
C.To work correctly with hash-based data structures, this class must also implement the hashCode method.
D.When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.
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单项选择题
A.Line 4 of class Target can be changed to return i++;
B.Line 2 of class Target can be changed to private int i = 1;
C.Line 3 of class Target can be changed to private int addOne(){};
D.Line 2 of class Target can be changed to private Integer i = 0;
多项选择题
A.When using versions of Java technology earlier than 5.0.
B.When sharing a StringBuffer among multiple threads.
C.When using the java.io class StringBufferInputStream.
D.When you plan to reuse the StringBuffer to build more than one string.
E.Enitiation of separate design processes to the separation of users
单项选择题
A.The value of s is 14-dic-2000.
B.The value of s is Dec 14, 2000.
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 13.
单项选择题
A.int Long
B.Short Long
C.Compilation fails.
D.An exception is thrown at runtime.
单项选择题
A.35. DateFormat df = DateFormat.getDateFormat();42. d.setTime((60 * 60 * 24) + d.getTime();
B.35. DateFormat df = DateFormat.getDateInstance();42. d.setTime((1000 * 60 * 60 * 24) +d.getTime());
C.35. DateFormat df = DateFormat.getDateFormat();42. d.setLocalTime((1000 * 60 * 60 * 24) +d.getLocalTime());
D.35. DateFormat df = DateFormat.getDateInstance(); 42. d.setLocalTime((60 * 60 * 24) +d.getLocalTime());
单项选择题
A.a,b,c
B.1,2,3
C.a1b2c3
D.a1 b2 c3
E.Compilation fails.
F.The code runs with no output.
G.An exception is thrown at runtime.
单项选择题
A.Compilation fails.
B.After line 15, the value of age is 5.
C.After line 15, the value of age is 3.
D.An exception is thrown at runtime.
多项选择题
A.The value of b is 2.
B.The value of a is 3.14.
C.The value of b is 2.00.
D.The value of a is 3.141.
E.The value of a is 3.1415.
F.The value of a is 3.1416.
G.The value of b is 2.0000.
单项选择题
A.True
B.Not true
C.An exception is thrown at runtime.
D.Compilation fails because of an error at line 12.
E.Compilation fails because of an error at line 19.