超星 - Quiz for Chapter 7

A. String[ ] a = new String [5]; for (int i = 0; i < 5; a[i++] = null);
B. String[] a = new String [5];
C. String[] a = {"", "", "", "", ""};
D. String[5] a;

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单选题

Analyze the following code. public class Test {public static void main(String[] args) {int[] x = new int[3];System.out.println("x[0] is " + x[0]);} }

A. The program has a runtime error because the array element x[0] is not defineD.
B. The program runs fine and displays x[0] is 0.
C. The program has a compile error because the size of the array wasn't specified when declaring the array.
D. The program has a runtime error because the array elements are not initializeD.

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单选题

Analyze the following code: public class Test1 { public static void main(String[] args) {xMethod(new double[]{3, 3});xMethod(new double[5]);xMethod(new double[3]{1, 2, 3});} public static void xMethod(double[] a) { System.out.println(A.length);} }

A. The program has a runtime error because a is null.
B. The program has a compile error because xMethod(new double[5]) is incorrect.
C. The program has a compile error because xMethod(new double[]{3, 3}) is incorrect.
D. The program has a compile error because xMethod(new double[3]{1, 2, 3}) is incorrect.

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单选题

Analyze the following code: public class Test { public static void main(String[] args) { int[] x = {1, 2, 3, 4}; int[] y = x; x = new int[2]; for (int i = 0; i < x.length; i++)System.out.print(x[i] + " ");} }

A. The program displays 1 2 3 4
B. The program displays 0 0 3 4
C. The program displays 0 0 0 0
D. The program displays 0 0

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