单项选择题
System.out.println（Math.sqrt（-4D））； What is the result？（）
A. –2
B. NaN
C. Infinity
D. Compilation fails.
E. An exception is thrown at runtime.
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单项选择题
Whichinterfacedoesjava.util.Hashtableimplement？（）
A. java.util.Map
B. java.util.List
C. java.util.Hashable
D. java.util.Collection -
单项选择题
publicclassTest{ publicstaticvoidmain（String[]args）{ Stringstr=NULL； System.out.println（str）； } } Whatistheresult？（）
A. NULL
B. Compilation fails.
C. The code runs with no output.
D. An exception is thrown at runtime. -
单项选择题
public class Test { private static float[] f = new float[2]； public static void main（String args[]） { System.out.println（“f[0] = “ + f[0]）； } } What is the result？（）
A. f[0] = 0
B. f[0] = 0.0
C. Compilation fails.
D. An exception is thrown at runtime.
