Exam1(Chap01-Chap06)

Exam (Covers chapters 1-6) 100 minsName:________________ No.:________________Part I: Multiple Choice Questions: (2 pts each)1. A runtime error implies the following:a. The program cannot be compiled.b. The program runs, but is terminated unexpectedly.c. The program runs, but produces incorrect results.d. None of the above2.When you run your program Test, you receive NoClassDefFoundError: Test. What is the reason?a. JVM cannot find Test.class.b. JVM cannot find Test.java.c. Test is not a public class.d. Test does not have a main method.e. Test does not have a constructor.3.When you run your program Test, you receive NoSuchMethodError: main. What is the reason?a. JVM cannot find Test.class.b. JVM cannot find Test.java.c. Test is not a public class.d. Test does not have a main method, or the signature of the main method is incorrect.e. Test does not have a constructor.4.What is the range of an int variable?a. 0 to 216.b. -216 to 216.c. -215 to 215-1.d. -216 to 216-1.e. None of the above.5.Which of the following statement is incorrect?a. byte b = 40;b. short s = 200;c. int i = 200;d. int j = 200L;6.According to Java naming convention, which of the following is a constant?a. MAXINTEGERb. MAX-INTEGERc. max_integerd. MAX_INTEGERe. max-integer7.Assume x=1 and y=2, what is the result of evaluating "x + y = " + x + y?a. x + y = 3b. x + y = 12c. Illegal operationsd. None of the above8.Assume x=1 and y=2, what is the result of evaluating ++x + y?a. 1b. 2c. 3d. 49.Assume x=1 and y=2, what is the result of evaluating x++ + y?a. 1b. 2c. 3d. 4e. None of the above10.Assume x=1 and y=2, what is x, after evaluating (x > 0) || (x-- > 0)?a. 1b. 2c. 3d. 4e. None of the above11.Assume x=1 and y=2, what is x, after evaluating (x > 0) | (x-- > 0)?a. 0b. 1c. 2d. 3e. None of the above12. Suppose x = 1, y = -1, and z = 1. What is the printout of the following statement? if (x > 0)if (y > 0)System.out.println("A");else if (z > 0)System.out.println("B");elseSystem.out.println("C");a. Ab. Bc. Cd. None of the above.13. Analyze the following program fragment:int x;double d = 1.5;switch (d) {case 1.0: x = 1;case 1.5: x = 2;}a. The required break statement is missing in the switch statement.b. The required default case is missing in the switch statement.c. The switch control variable cannot be double.d. None of the above.14. Which of the following statement is true?a. You can define a method inside a method.b. A local variabl e in a method always has a default value if you don’t explicitly assign a value to it.c. A method can be declared with no parameters.d. None of the above is true.15. What is item after the following loop terminates?int sum = 0;int item = 0;do {item += 1;sum += item;if (sum > 4) break;}while (item < 5);a. 2b. 3c. 4d. 5e. None of the above16. Analyze the following fragment:double sum = 0;double d = 0;while (d != 10.0) {d += 0.1;sum += sum + d;}a. The program does not compile because sum and d are declared double, but assigned with integervalue 0.b. The program never stops because d is always 0.1 inside the loop.c. The program may not stop because of the phenomenon referred to as numerical inaccuracy foroperating with floating-point numbers.d. None of the above.17. A call for a method with a void return type is always a statement itself, but a call for the methodwith a non-void return type can be treated as either a statement or an expression.a. True.b. False.18. Which of the following is true.a. x.length does not exist if x is null.b. The array index is not limited to int type.c. An array variable can be declared and redeclared in the same block.d. Binary search can be applied on an unsorted list.19. Which of the following is false.a. You can use the operator == to check whether two variables refer to the same array.b.The copyarray method does not allocate memory space for the target array. The target array mustalready be created with memory space allocated.c.The array index of the first element in an array is 0.d.The element in the array must be of primitive data type.20. Analyze the following code:public class Test {public static void main(String[] args) {int[] x = {1, 2, 3, 4};x = new int[2];int[] y = x;for (int i = 0; i < y.length; i++)System.out.print(y[i] + " ");}}a. The program displays 1 2 3 4.b. The program displays 0 0.c. The program displays 0 0 3 4.d. The program displays 0 0 0 0.Part II. Show the printout of the following code:a. (2.5 pts)public class Test {public static void main(String[] args) {for (int i = 1; i <= 5; i++) {for (int j = 1; j <= i; j++)System.out.print(j + " ");System.out.print('\n');}}}b. (2.5 pts)public class Test {public static void main(String[] args) {int i = 1;while (i++ <= 5) {xMethod(i);}System.out.println("i is " + i);}public static void xMethod(int i) {do {if (i%2 != 1)System.out.print(i + " ");i--;}while (i >= 1);System.out.println();}}c. (2.5 pts)public class Test {public static void main ( String[] args) {int[][] r = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};for (int k = 0; k < r.length; k++)for (int j = 0; j < r[k].length; j++)System.out.print(r[j][k] + " ");}}d. (2.5 pt)public class Test {public static void main(String[] args) {double[] numbers = {1, 4.3, 5.55, 3.4};double[] x = new double[numbers.length];System.arraycopy(numbers, 1, x, 0, 3);for (int i = 0; i < x.length; i++)System.out.print(x[i] + " ");}}Part III (Write programs)a. (2.5 pts) Write a main method to let a user enter student scores, and display the max, min, and average of the score. The input 0 signifies the end of input.b. (2.5pts) Write a method that gets an element from an array randomly. The method signature is as follows:public static double getRandomElement(double[ ] a)c. (2.5 pts) Write a method to find the max in an array of double values. The method signature is as follows:public static double max(double[ ] a)d. (2.5 pts) Write a method to find the max in a two-dimensional array of double values. The method signature is as follows:public static double max(double[ ][ ] a)。