【笔记】Eclipse and Java for Total Beginners—006

Lesson 06 – Using Test-First Development in Eclipse

  • Use test-first approach to write the Person toString() method
  • Method overriding
  • Field Hiding

1. toString() method

  • inherited from Object class
  • returns a String representation of the object
  • normally create for every class

2. Test-driven development

  • Think about what the method should do.
  • Write a test case that will test this method.
  • Write the new method.
  • Test the new method.
  • when it passes.. we’re done!

3. Test-driven development benefits

  • Forced to create detailed specifications before coding.
  • Test method serves as specification, documentation, and as unit test.
  • When method passes the test, method is complete and correct.
 1 package org.totalbeginner.tutorial;
 2 
 3  import org.totoalbeginner.tutorial.Person;
 4 
 5  import junit.framework.TestCase;
 6 
 7  public class PersonTest extends TestCase {
 8 
 9     public void testPerson() {
10         Person p1 = new Person();
11         assertEquals("unknown name", p1.getName());
12         assertEquals(3, p1.getMaximumBooks());
13     }
14 
15     public void testSetName() {
16         Person p2 = new Person();
17         p2.setName("Fred");
18         assertEquals("Fred", p2.getName());
19     }
20 
21     public void testSetMaximumBooks() {
22         Person p3 = new Person();
23         p3.setMaximumBooks(10);
24         assertEquals(10, p3.getMaximumBooks());
25     }
26     
27     public void testToString() {
28         Person p4 = new Person();
29         p4.setName("Fred Flintstone");
30         p4.setMaximumBooks(7);
31         String testString = "Fred Flintstone (7 books)";
32         assertEquals(testString, p4.toString());
33     }
34 
35 }
 1 package org.totoalbeginner.tutorial;
 2 
 3  public class Person {
 4     
 5     // fields
 6     private String name;    // name of the person
 7     private int maximumBooks;    // most books the person can check out
 8     
 9     // constructors
10     public Person() {
11         name = "unknown name";
12         maximumBooks = 3;
13     }
14     
15     // methods
16     public String getName() {
17         return name;
18     }
19     
20     public void setName(String anyName) {
21         name = anyName;    
22     }
23 
24     public int getMaximumBooks() {
25         return maximumBooks;
26     }
27 
28     public void setMaximumBooks(int maximumBooks) {
29         this.maximumBooks = maximumBooks;
30     }
31     
32     public String toString() {
33         return this.getName() + " (" + getMaximumBooks()
34         + " books)";
35     }
36 
37 }

posted on 2011-06-10 15:32  yf.x  阅读(233)  评论(0)    收藏  举报

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