单项选择题
public class Test {
private static int[] x;
public static void main(String[] args) {
System.out.println(x[0]);
}
}
What is the result?()
A. 0
B. null
C. Compilation fails.
D. A NullPointerException is thrown at runtime.
E. An ArrayIndexOutOfBoundsException is thrown at runtime.
相关考题
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多项选择题
Whichtwoarevaliddeclarationsofafloat?()
A. float f = 1F;
B. float f = 1.0.;
C. float f = ‘1’;
D. float f = “1”;
E. float f = 1.0d; -
单项选择题
// Point X public class foo { public static void main(String[] args) throws Exception { jave.io.PrintWriter out = new jave.io.PrintWriter( new jave.io.OutputStreamWriter(System.out), true); out.println(“Hello”); } } Which statement at Point X on line 1 is required to allow this code to compile?()
A. No statement is required.
B. import jave.io.*;
C. include java.io.*;
D. import jave.io.PrintWriter;
E. include java.io.PrintWriter; -
多项选择题
ArraryList a = new ArrayList(); a.add(“Alpha”); a.add(“Bravo”): a.add(“Charlie”); a.add(“Delta”); Iterator iter = a.iterator(); Which two, added at line 17, print the names in the ArrayList in alphabetical order?()
A. for (int i=0; i< a.size(); i++) System.out.println(a.get(i)));
B. for (int i=0; i< a.size(); i++) System.out.println(a[i]);
C. while( iter.hasNext() ) System.out.println(iter.next()) ;
D. for (int i=0, i< a.size(); i++) System.out.println(iter[i]);
E. for (int i=0; i< a.size(); i++) System.out.println(iter.get(i));
