单项选择题
A. –2 B. NaN C. Infinity D. Compilation fails. E. An exception is thrown at runtime.
Whichinterfacedoesjava.util.Hashtableimplement？（）A. jav...
单项选择题Which interface does java.util.Hashtable implement？（）
A. java.util.Map B. java.util.List C. java.util.Hashable D. java.util.Collection
publicclassTest{ publicstaticvoidmain（String[]args）{ St...
public class Test { public static void main（String[] args） { String str = NULL； System.out.println（str）； } } What is the result？（）
A. NULL B. Compilation fails. C. The code runs with no output. D. An exception is thrown at runtime.
public class Test { private static float[] f = new flo...
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.
