在循環中創建的訪問按鈕

Question

我創建了一個包含多個按鈕的板， 900+。由於這是很多工作，我認爲我會循環做。但是現在我想爲每個按鈕添加一個ActionListener，這些按鈕將爲行i和列j中的按鈕賦予arrary number [i] [j]值1.我不認爲有任何方法可以做到這一點，它按鈕按鈕。我已經期待你的回答。在這裏我的代碼：

import java.awt.Color; 
import java.awt.EventQueue; 
import java.awt.Font; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.JFrame; 
import javax.swing.JButton; 


public class MakeMotive { 
    int howManyButtonsVer = 34; 
    int howManyButtonsHor = 27; 
    int sideLength = 50; 
    int [][] number = new int [howManyButtonsHor+1][howManyButtonsVer+1]; 
    JButton[][] button = new JButton [howManyButtonsHor+1][howManyButtonsVer+1]; 
    private JFrame frame; 
    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 
       public void run() { 
        try { 
         MakeMotive window = new MakeMotive(); 
         window.frame.setVisible(true); 
        } catch (Exception e) { 
             e.printStackTrace(); 
             } 
     } 
    }); 
} 

public MakeMotive(){ 
    frame = new JFrame("Menu"); 
    frame.getContentPane().setBackground(Color.yellow); 
    frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setLocationRelativeTo(null); 
    frame.getContentPane().setLayout(null); 
    frame.setVisible(true); 


    for(int i = 0; i<=howManyButtonsHor; i++){ 
     for(int j = 0; j<=howManyButtonsVer; j++){ 
      button[i][j] = new JButton(); 
      button[i][j].setBounds(sideLength*i, sideLength*j, sideLength,sideLength); 
      button[i][j].setFont(new Font("Tahoma",Font.PLAIN, 10)); 
      button[i][j].setBackground(Color.green); 
      button[i][j].setText(i+"a"+j); 
      frame.getContentPane().add(button[i][j]); 
      button[i][j].addActionListener(new ActionListener(){ 
       public void actionPerformed(ActionEvent e){ 

          } 
      }); 
     } 
    }; 
} 

}

Answer 1

看看這個代碼：

import javax.swing.JButton; 
import javax.swing.JFrame; 

import java.awt.Color; 
import java.awt.EventQueue; 
import java.awt.Font; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

public class MakeMotive { 
    private static int howManyButtonsVer = 34; 
    private static int howManyButtonsHor = 27; 
    private static int sideLength = 50; 
    private int[][] number = new int[howManyButtonsHor + 1][howManyButtonsVer + 1]; 
    private JButton[][] button = new JButton[howManyButtonsHor + 1][howManyButtonsVer + 1]; 
    private JFrame frame; 

    private MakeMotive() { 
     frame = new JFrame("Menu"); 
     frame.getContentPane().setBackground(Color.yellow); 
     frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setLocationRelativeTo(null); 
     frame.getContentPane().setLayout(null); 
     frame.setVisible(true); 

     MyActionListener myActionListener = new MyActionListener(this); // one action listener 
     for (int i = 0; i <= howManyButtonsHor; i++) { 
      for (int j = 0; j <= howManyButtonsVer; j++) { 
       button[i][j] = new MyButton(i, j); // create your own button, that knows its location 
       button[i][j].setBounds(sideLength * i, sideLength * j, sideLength, sideLength); 
       button[i][j].setFont(new Font("Tahoma", Font.PLAIN, 10)); 
       button[i][j].setBackground(Color.green); 
       button[i][j].setText(i + "a" + j); 
       frame.getContentPane().add(button[i][j]); 
       button[i][j].addActionListener(myActionListener); // add the one listener to all buttons 
      } 
     } 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(() -> { 
      try { 
       MakeMotive window = new MakeMotive(); 
       window.frame.setVisible(true); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     }); 
    } 

    private void markValue(int i, int j) { 
     number[i][j] = 1; 
    } 

    private final static class MyButton extends JButton { 
     private final int i; 
     private final int j; 

     MyButton(int i, int j) { 
      this.i = i; 
      this.j = j; 
     } 
    } 

    private class MyActionListener implements ActionListener { 
     private MakeMotive makeMotive; 

     MyActionListener(MakeMotive makeMotive) { 
      this.makeMotive = makeMotive; 
     } 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      MyButton source = (MyButton) e.getSource(); // its your own button 
      makeMotive.markValue(source.i, source.j); // get the location and mark the array position 
     } 
    } 
} 

有你有你自己的按鈕類，保存其位置的變量，並詢問了一個單一的動作監聽器事件源（你的按鈕）關於他的位置並將其保存在數組數組中。

你也可以完全移除數組數組，並給你的按鈕一個變量「selected」。