bookTest.java打印出作者arrayList,但不是isbn

时间:2015-07-21 18:21:42

标签: java arraylist isbn

要求:使用Java Collection Framework中的一个组件来容纳多个作者。需要一本带有isbn和一组作者的书。 JUnit:testValidate指南:测试至少两种情况(一种情况是书籍属性包含正确的数据类型且不为空也不保留空值,一种情况不存在)。 testEquals指南:测试至少两个案例(一个案例是作者和isbn匹配,一个是他们不匹配的案例)。测试至少两位作者。我的老师告诉我:testEquals你需要添加isbn和两位作者。创建一个ArrayList。添加两位作者。创建一个Book对象并添加ArrayList实例和isbn。我认为这就是我所做的,作者正在打印,但ISBN不是。我是个新手,我不知所措!有人可以帮忙吗?

编辑/添加我打印了ISBN,但它只打印了我的第二个isbn。我需要更改什么才能让它们都打印出来?或者重要吗?

以下是输出:

Testsuite: library.domain.BookTest
equals
Author List: [Bob Smith, Jane Doe]
ISBN: 67890
validate
Author List: [Bob Smith, Jane Doe]
ISBN: 67890
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.23 sec

------------- Standard Output ---------------
equals
Author List: [Bob Smith, Jane Doe]
ISBN: 67890
validate
Author List: [Bob Smith, Jane Doe]
ISBN: 67890
------------- ---------------- ---------------
test:
Deleting: /var/folders/k7/wpgy3lw91171qxlzt4pj0cfh0000gn/T/TEST-library.domain.BookTest.xml
BUILD SUCCESSFUL (total time: 1 second)

这是我的新页面:

新BookTest.java

package library.domain;

import java.util.ArrayList;
import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class BookTest {

    private ArrayList<String> authorList = new ArrayList<>();

    @Test
    public void testEquals()                //test Equals() for accuracy
    {
        System.out.println("equals");
        authorList.add("Bob Smith");
        Book book = new Book("12345", authorList);
        assertEquals("expected true", true, book.equals(book));
        authorList.add("Jane Doe");
        book = new Book("67890", authorList);
        assertEquals("expected true", true, book.equals(book));
        System.out.println("Author List: " + authorList);
        System.out.println("ISBN: " + book.getIsbn());
    }

    @Test
    public void testValidate()          //test Validate() for accuracy
    {
        System.out.println("validate");
        authorList.add("Bob Smith");
        Book book = new Book("12345", authorList);
        assertEquals("expected true", true, book.validate());
        authorList.add("Jane Doe");
        book = new Book("67890", authorList);
        assertEquals("expected true", true, book.validate());
        System.out.println("Author List: " + authorList);
        System.out.println("ISBN: " + book.getIsbn());
    }
}

Book.java

package library.domain;

import java.util.ArrayList;
import java.util.Objects;

public class Book {

    private String isbn;
    private ArrayList<String> authorList;

    public Book(String isbn, ArrayList<String> authorList)
    {
        this.isbn = isbn;
        this.authorList = authorList;
    }

    public String getIsbn()             //access to isbn and manages  next value
    {
        return isbn;
    }

    public void setIsbn(String isbn)            //assigns the input isbn to the data member isbn
    {
        this.isbn = isbn;
    }
//assigns the input author to the data member author

    public ArrayList<String> getAuthorList()
    {
        return authorList;
    }

    public void setAuthorList(ArrayList<String> authorList)
    {
        this.authorList = authorList;
    }

    @Override
    public boolean equals(Object obj)           //checks  equality of two objects - true if same, false if different
    {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof Book)) {
            return false;
        }

        Book book = (Book) obj;
        if (!this.isbn.equals(book.isbn)) {
            return false;
        }
        if (!this.authorList.equals(book.authorList)) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode()           //override hash
    {
        int hash = 7;
        hash = 97 * hash + Objects.hashCode(this.authorList);
        hash = 97 * hash + Objects.hashCode(this.isbn);
        return hash;
    }

    public boolean validate()           //validate isbn and author not null
    {
        if (isbn == null || isbn.equals("")) {
            return false;
        }
        if (authorList == null || authorList.equals("")) {
            return false;
        }
        {
            return true;
        }
    }
}

BookTest.java

package library.domain;

import java.util.ArrayList;
import static org.junit.Assert.assertEquals;
import org.junit.Test;

public class BookTest {

    private ArrayList<String> authorList = new ArrayList<>();
    private String isbn;

    @Test
    public void testEquals()                //test Equals() for accuracy
    {
        System.out.println("equals");
        authorList.add("Bob Smith");
        authorList.add("Jane Doe");
        Book book = new Book("12345", authorList);
        assertEquals("expected true", true, book.equals(book));
        System.out.println("Author List: " + authorList);
        System.out.println("ISBN: " + isbn);
    }

    @Test
    public void testValidate()          //test Validate() for accuracy
    {
        System.out.println("validate");
        authorList.add("Bob Smith");
        authorList.add("Jane Doe");
        Book book = new Book("12345", authorList);
        assertEquals("expected true", true, book.validate());
        System.out.println("Author List: " + authorList);
        System.out.println("ISBN: " + isbn);
    }
}

4 个答案:

答案 0 :(得分:0)

测试类中的

isbn是一个局部变量,并且您没有为它设置任何值。要检查对象是否正确创建,请尝试打印book.getAuthorList()和book.getIsbn()

答案 1 :(得分:0)

Book book = new Book("12345", authorList);

您可以在isbn课程中设置Book的价值。

   System.out.println("ISBN: " + isbn);

但是你在这里尝试打印当前类中的isbn。因此它不会打印任何值。因为你没有传递任何价值。

打印isbn类值Book中可用的值{/ 1}}

   System.out.println("ISBN: " + book.getIsbn());


   System.out.println("Author List: " + authorList);

此处authorList也是一个局部变量。打印authorList Book的值可在 System.out.println("Author List: " + book.authorList()); 类wirte

中找到
jasypt {
    algorithm = "PBEWithMD5AndTripleDES"
    password = "password"
    keyObtentionIterations = 1
    saltGenerator = new org.jasypt.salt.ZeroSaltGenerator()
}

答案 2 :(得分:0)

在BookTest中,您将在BookTest范围内打印出isbn的值。您在BookTest中初始化它,因此对isbn的任何调用都将引用全局变量

private String isbn;

您需要打印Book对象的isbn字段。

System.out.println("ISBN: " + book.getIsbn());

你写了getter方法,你只是忘了使用它。

答案 3 :(得分:0)

访问ISBNauthorList时,您应该使用他们的getter方法。在您的测试中,没有名为String的{​​{1}}对象。而是使用ISBN

其他一些事情:

book.getIsbn();方法中; authorList是validate()而不是List,因此String永远不会返回true。你应该做authorList.equals("")之类的事情。 authorList.size() == 0也不需要在return true范围内。

此外,您不应该只是尝试打印列表({})。你可能会得到意想不到的结果。