INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）TEST7.docVIP

1 __________ represents an entity in the real world that can be distinctly identified. A. A class B. An object C. A method D. A data field B 2 _______ is a construct that defines objects of the same type. A. A class B. An object C. A method D. A data field A 3 The keyword __________ is required to declare a class. A. public B. private C. class D. All of the above. C 4 ________ is invoked to create an object. A. A constructor B. The main method C. A method with a return type D. A method with the void return type A 5 Which of the following statements are true? A. A default no-arg constructor is provided automatically if no constructors are explicitly declared in the class. B. At least one constructor must always be defined explicitly. C. Constructors do not have a return type, not even void. D. Constructors must have the same name as the class itself. E. Constructors are invoked using the new operator when an object is created. ACDE 6 Analyze the following code:public class Test {??public static void main(String[] args) {????A a = new A();????a.print();??}}class A {??String s;??A(String s) {????this.s = s;??}??void print() {????System.out.println(s);??}} A. The program has a compilation error because class A is not a public class. B. The program has a compilation error because class A does not have a default constructor. C. The program compiles and runs fine and prints nothing. D. The program would compile and run if you change A a = new A() to A a = new A(5). BD 7 What is wrong in the following code?class TempClass {??int i;??public void TempClass(int j) {????int i = j;??}}public class C {??public static void main(String[] args) {????TempClass temp = new TempClass(2);??}} A. The program has a compilation error because TempClass does not have a default constructor. B. The program has a compilation error because TempClass does not have a constructor with an int argument. C. The program compiles fine, but it does not run because clas