这是我的类,因为文本区域只获取数组中的最后一个对象。我需要 JTextArea 来显示数组中的所有对象。我已经修复了数组问题,但是,我不知道如何让我的按钮检索数组。我想在我的驱动程序类中实现一个 actionlistener,但我收到静态错误,java 希望我将内容设为 final,但这永远无法解决问题。我已经更新了代码来传达我的问题。
public class drink
{
private String name;
private String carb;
private String desc;
public drink(String drinkName, String carbDetail, String descDetail)
{
name = drinkName;
carb = carbDetail;
desc = descDetail;
}
public String toString()
{
return(name + carb + desc);
}
}
public class drinkViewer
{
private String string;
private String name;
private drink[] theDrinks;
private int drinkCount=0;
public drinkViewer(String Name)
{
name = Name;
theDrinks = new drink[5];
}
public void addDrink(String drinkName, String carbDetail, String descDetail)
{
theDrinks[drinkCount] = new drink(drinkName, carbDetail, descDetail);
drinkCount++;
}
public void getdrinkArray()
{
for(int i=0;i<drinkCount;i++)
{
string += (theDrinks[i].toString()+"\n");
//System.out.println(string);
}
}
}//end
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.JTextArea;
public class driver
{
private JTextArea area;
public static void main(String args[])
{
drinkViewer newViewer = new drinkViewer("test");
newViewer.addDrink("orange", "fruit", "noncarb");
newViewer.addDrink("beer", "5%","carb");
newViewer.loop();
//JTextArea area = new JTextArea(newViewer.getString());
JFrame frame = new JFrame("Drink Descriptions");
frame.setVisible(true);
frame.setSize(400,400);
JButton button = new JButton("Button");
JPanel panel = new JPanel();
frame.add(panel,BorderLayout.NORTH);
panel.add(button,BorderLayout.NORTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.add(area,BorderLayout.SOUTH);
class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
JTextArea area = new JTextArea(newViewer.getdrinkArray());
}
}
listener = new ButtonListener();
}
}//end
最佳答案
在 loop()
方法中更改此行 string = (theDrinks[i].toString()+"\n");
到 string += (theDrinks[i].toString()+"\n");
并在 drinkViewer
构造函数中用 string = "";
初始化你的 string
变量,否则你会看到 null...
在你的输出中。
关于java - 使用按钮从另一个类中的数组填充 JTextArea,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9346242/