java - 愚蠢的 For 循环实现

Question

使用 java.awt 和 javax.swing 我一直在制作一个小型 GUI，它将在 JPanel 中显示多个条目。在成功显示带有默认文本的单个条目后，我开始尝试实现一个 for 循环以从几个数组创建多个条目，并且在加载标记每个组件的文本字符串时遇到困难。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。

这是我专门使用的代码:

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); }
}

显然我对数组做了一些错误的操作，或者设置了组件，但是经过多次尝试和谷歌搜索后我丢失了一些东西。非常感谢任何帮助。

Answer 1

我实际上没有尝试运行你的程序，但我确实注意到你的循环:

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); } 

在此循环中，您将计数器变量“x”初始化为 0，但在下一个语句中您有:x == 2，仅当 x 等于 2 时才会运行循环，并且因为 x 是初始化为 0，该循环将永远不会运行。尝试将语句 x == 2 更改为 x < 2，看看这是否有帮助。