Question

使用java.awt和javax.swing我一直在制作一个小的GUI，它将在JPanel中显示多个条目。在使用默认文本成功显示单个条目后，我开始尝试实现for循环以从少数几个数组创建多个条目，并且很难加载标记每个组件的文本字符串。添加for循环和数组后，我现在只在一个没有数据的小空间周围得到一个黑色边框。

以下是我正在使用的代码：

package myInterfaceComponents;

import java.awt.*;

public class ListOfEntries extends JComponent {
   //instance variables
      //worked until arrays added
      String[] telephones = {"5551234567", "5557654321", "5555671234"};
      String[] names = {"Emily", "Billy Bob", "Wiley Coyote"};
      String[] periods = {"2p - 3p", "1a - 5a", "4:30p - 11p"};
   private JLabel telephone = new JLabel(); 
   private JTextField name = new JTextField();
   private JButton period = new Button();
   private StatusCombo serviceCycle = new StatusCombo();
   private AreaCombo area = new AreaCombo();

   //constructors
   public ListOfEntries() {
      setLayout(new GridLayout(2, 3));

      for (int x = 0; x == 2; x++) {         //worked until added
         telephone.setText(telephones[x]);   //worked until added
         name.setText(names[x]);             //worked until added
         period.setText(periods[x]);         //worked until added
         add(telephone);         
         add(name);
         add(area);
         add(period);
         add(serviceCycle); }                //worked until add: "}"

   Border line = BorderFactory.createLineBorder(Color.BLACK);
   Border titled = BorderFactory.createTitledBorder(line, "Day: DD MMM YYYY");
   setBorder(visible);
   setVisible(true); }
}

显然我正在对阵列做错事，或者设置组件，但经过多次尝试后才会出现问题。谷歌搜索我错过了一些东西。非常感谢任何帮助。

Answer 1

我还没有尝试过运行你的程序，但我注意到你的循环：

for (int x = 0; x == 2; x++) {         //worked until added
         telephone.setText(telephones[x]);   //worked until added
         name.setText(names[x]);             //worked until added
         period.setText(periods[x]);         //worked until added
         add(telephone);         
         add(name);
         add(area);
         add(period);
         add(serviceCycle); }

在这个循环中，你将计数器变量“x”初始化为0，但是在下一个语句中你有：x == 2，只有当x等于2时才会运行循环，并且因为x是初始化为0，此循环将永远不会运行。尝试将语句x == 2更改为x＆lt; 2，看看这是否有帮助。

愚蠢的For循环实现

1 个答案: