Java考试题2_答案.docVIP

北京交通大学 软件学院05级 《面向对象的编程与设计》期末考试试卷B Part 1: Single-choice questions（20 points） 1、、、、、、、、0、-choice questions（30 points） 1、2、3、4、5、6、A,C 7、8、9、10、 Part 3: Read Programs（15 points） Please reading the following program carefully, and give the correct answer. 1. (7 points) 答案: 1:i = 100 2:i = 102 2.(8 points) Answer: set Fathers age:3 Set Sons age:2 Son.eat() Son.eat() set Fathers age:2 Set Sons age:1 Son.eat() set Fathers age:2 Father.eat() 3 Answer: Output Value is :4 Once More Output Value is :5 Exception is: UserException:5 无限循环 Once More Part 4: Programming（40 points） (8 points) (8 points) （3分） class Person{ private int id; private String name; // get/set method } （3分） class Engineer extends Person implements Iterable Project { private ArrayListProject projects; //相应集合的操作 } （3分） class Project implements Iterable ProjectTask { private String projectID; private String projectName; private Date startDate; private ArrayList ProjectTask tasks; //相应的get/set方法和集合的操作 } （3分） class ProjectTask { private int studentID; private String studentName; private int studentGrade; // get/set method } (6 points) public void getTasks(String aTasksFile) BufferedReader reader = new BufferedReader(new FileReader(aTasksFile)); String line = reader.readLine(); while (line != null) { if (tokenizer.countTokens() != 3) { System.out.println(“should have three data”); break; } else{ StringTokenizer tokenizer = new StringTokenizer(line, ‘_’); int engineerID = tokenizer.nextToken(); String engineertName= tokenizer.nextToken(); String engineerTask= tokenizer.nextToken(); ProjectTask pt=new ProjectTask (engineerID, engineertName, engineerTask); tasks.add (pt); line = reader.readLine(); } } reader.close(); } (6 points) public class MyGUI{ public void createGUI(){ JFrame myWindow=new JFrame(); JList myList=ne