问题：
如何/如何让java-ascii-table在给定的上下文中显示testObject的字段值？
背景
这是我为测试一个＆＃39;显示器类而建立的一个小程序。我一直在努力。在我正在构建/测试显示器的应用程序中，我正在从.csv读取数据，然后将其分配给Product＆amp;的实例。将这些实例存储在ArrayList中（它就像一个库存）。
在当前的迭代中，我使用了java-ascii-table。这个小测试程序重新创建了我的基本需求：创建一个表格，显示ArrayList中保存的对象的字段值（ID，名称，类别，价格）。
有关java-ascii-table的信息，请访问：
https://code.google.com/p/java-ascii-table/
在这里：
http://bethecoder.com/applications/products/asciiTable.action
这是我的代码基于（它是第一个链接上的第5个示例）的示例：
//Example5
//The following example shows rendering the ASCII Table from list of java beans.
Employee stud = new Employee("Sriram", 2, "Chess", false, 987654321.21d);
Employee stud2 = new Employee("Sudhakar", 29, "Painting", true, 123456789.12d);
List<Employee> students = Arrays.asList(stud, stud2);
IASCIITableAware asciiTableAware =
new CollectionASCIITableAware<Employee>(students,
//properties to read
"name", "age", "married", "hobby", "salary");
ASCIITable.getInstance().printTable(asciiTableAware);
asciiTableAware =
new CollectionASCIITableAware<Employee>(students,
//properties to read
Arrays.asList("name", "age", "married", "hobby", "salary"),
Arrays.asList("STUDENT_NAME", "HIS_AGE")); //custom headers
ASCIITable.getInstance().printTable(asciiTableAware);
//It prints the following tables in the console.
+----------+-----+---------+----------+----------------+
| NAME | AGE | MARRIED | HOBBY | SALARY |
+----------+-----+---------+----------+----------------+
| Sriram | 2 | false | Chess | 987,654,321.21 |
| Sudhakar | 29 | true | Painting | 123,456,789.12 |
+----------+-----+---------+----------+----------------+
+--------------+---------+---------+----------+----------------+
| STUDENT_NAME | HIS_AGE | MARRIED | HOBBY | SALARY |
+--------------+---------+---------+----------+----------------+
| Sriram | 2 | false | Chess | 987,654,321.21 |
| Sudhakar | 29 | true | Painting | 123,456,789.12 |
+--------------+---------+---------+----------+----------------+
我的代码：
主
创建ArrayListMaker的实例，调用Displayz中的方法
这是有问题的方法：
这只会显示一个＆＃39;徽标＆＃39;，并不重要：
代码
package playGround2;
public class Main {
public static void main(String[] arg) {
ArrayListMaker arrayListMaker = new ArrayListMaker();
Displayz.displayProduct2(arrayListMaker);
Displayz.displaySurvivalStoreLogo();
}
}
ArrayListMaker
ArrayListMaker的每个实例都有自己的ArrayList，testObjectsList。 testObjectsList是TestObject实例的ArrayList。
package playGround2;
import java.util.ArrayList;
public class ArrayListMaker {
public ArrayList<TestObject> testObjectsList;
public ArrayListMaker() {
testObjectsList = new ArrayList<TestObject>();
testObjectsList.add( new TestObject("11","One", "This", "10"));
testObjectsList.add( new TestObject("12", "Two", "That", "20"));
testObjectsList.add( new TestObject("13", "Three", "Other", "30"));
testObjectsList.add( new TestObject("14", "four", "something", "40"));
testObjectsList.add( new TestObject("15", "five", "else", "50"));
testObjectsList.add( new TestObject("16", "six", "over-there", "60"));
testObjectsList.add( new TestObject("17", "seven", "Who", "70"));
testObjectsList.add( new TestObject("18", "eight", "Why", "80"));
}
public ArrayList<TestObject> getTestObjects() {
return this.testObjectsList;
}
}
的TestObject
POJO。字段：ID，名称，catagory，价格... setter，getters等...
package playGround2;
public class TestObject {
private String ID;
private String name;
private String category;
private String price;
/********************constructors********************/
public TestObject() {
// TODO Auto-generated constructor stub
}
public TestObject(String ID, String name, String category, String price) {
this.setID(ID);
this.setName(name);
this.setCategory(category);
this.setPrice(price);
}
/********************get & set********************/
/**********ID**********/
public String getID() {
return ID;
}
public void setID(String iD) {
ID = iD;
}
/**********name**********/
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
/**********category**********/
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
/**********price**********/
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
}
Displayz
有显示数据的方法（＆amp; a＆＃39; logo＆＃39;）。
这是我创建表格所需的方法。我已根据上面的例子编写了一些代码。但由于这对我来说是新的，我可能会离开。
代码
package playGround2;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.bethecoder.ascii_table.ASCIITable;
import com.bethecoder.ascii_table.impl.*;
import com.bethecoder.ascii_table.spec.*;
public class Displayz {
public static void displaySurvivalStoreLogo() {
BufferedImage bufferedImage = new BufferedImage(144, 32, BufferedImage.TYPE_INT_RGB);
Graphics graphics = bufferedImage.createGraphics();
graphics.setFont(new Font("Dialog", Font.PLAIN, 24));
Graphics2D graphics2d = (Graphics2D) graphics;
graphics2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
graphics2d.drawString("SurvivalStore", 6, 24);
try {
ImageIO.write(bufferedImage, "png", new File("text.png"));
}
catch (IOException e) {
e.printStackTrace();
}
for (int y = 0; y < 32; y++) {
StringBuilder stringBuilder = new StringBuilder();
for (int x = 0; x < 144; x++) {
stringBuilder.append(bufferedImage.getRGB(x, y) == -16777216 ? " " : bufferedImage.getRGB(x, y) == -1 ? "#" : "*");
}
if (stringBuilder.toString().trim().isEmpty()) {
continue;
}
System.out.println(stringBuilder);
}
} //end of displaySurvivalStore
public static void displayProduct2(ArrayListMaker arrayListMaker) {
IASCIITableAware asciiTableAware = new CollectionASCIITableAware<TestObject>(arrayListMaker.getTestObjects(),"ID", "name", "category", "price");
ASCIITable.getInstance().printTable(asciiTableAware);
// In this argument(Arrays.asList("name", "category", "price")), Arrays in underlined in red
asciiTableAware = new CollectionASCIITableAware<TestObject>(arrayListMaker.getTestObjects(), Arrays.asList("ID", "name", "category", "price"), ASCIITable.getInstance().printTable(asciiTableAware);
}
}
答案 0 :(得分：1)
基本上，你的问题归结为这一行......
asciiTableAware = new CollectionASCIITableAware<TestObject>(arrayListMaker.getTestObjects(), Arrays.asList("ID", "name", "category", "price"), ASCIITable.getInstance().printTable(asciiTableAware);
List<?>, List<String>, void没有构造函数（你没有留下拖尾) ...你偶然合并到代码行
应该更像是......
asciiTableAware = new CollectionASCIITableAware<TestObject>(arrayListMaker.getTestObjects(), Arrays.asList("ID", "name", "category", "price"));
ASCIITable.getInstance().printTable(asciiTableAware);
但是等等，List<?>, List<String>也没有构造函数？！？它需要最后一个参数，List<String>代表标题......
asciiTableAware = new CollectionASCIITableAware<TestObject>(testObjectsList, Arrays.asList("id", "name", "category", "price"), Arrays.asList("A ID", "First Name", "The Category", "Payup"));
ASCIITable.getInstance().printTable(asciiTableAware);
啊，现在它编译......
但等等，当我们运行它时......
+------+-------+------------+-------+
| ID | NAME | CATEGORY | PRICE |
+------+-------+------------+-------+
| null | One | This | 10 |
| null | Two | That | 20 |
| null | Three | Other | 30 |
| null | four | something | 40 |
| null | five | else | 50 |
| null | six | over-there | 60 |
| null | seven | Who | 70 |
| null | eight | Why | 80 |
+------+-------+------------+-------+
+------+------------+--------------+-------+
| A ID | FIRST NAME | THE CATEGORY | PAYUP |
+------+------------+--------------+-------+
| null | One | This | 10 |
| null | Two | That | 20 |
| null | Three | Other | 30 |
| null | four | something | 40 |
| null | five | else | 50 |
| null | six | over-there | 60 |
| null | seven | Who | 70 |
| null | eight | Why | 80 |
+------+------------+--------------+-------+
为什么我们null获得ID？??
API遵循方法名称Code Conventions for the Java TM Programming Language和JavaBeans的Java Bean /编码约定，这意味着它实际上期望ID为Id
因此，如果我们更改集合并将TestObject的方法设为setId和getId并再次运行，我们就会
+----+-------+------------+-------+
| ID | NAME | CATEGORY | PRICE |
+----+-------+------------+-------+
| 11 | One | This | 10 |
| 12 | Two | That | 20 |
| 13 | Three | Other | 30 |
| 14 | four | something | 40 |
| 15 | five | else | 50 |
| 16 | six | over-there | 60 |
| 17 | seven | Who | 70 |
| 18 | eight | Why | 80 |
+----+-------+------------+-------+
+------+------------+--------------+-------+
| A ID | FIRST NAME | THE CATEGORY | PAYUP |
+------+------------+--------------+-------+
| 11 | One | This | 10 |
| 12 | Two | That | 20 |
| 13 | Three | Other | 30 |
| 14 | four | something | 40 |
| 15 | five | else | 50 |
| 16 | six | over-there | 60 |
| 17 | seven | Who | 70 |
| 18 | eight | Why | 80 |
+------+------------+--------------+-------+