在ActionListener中调用

Question

我试图插入我的代码到我的GUI此刻我无法找到一种方法来调用ActionListener中的文本与打破我的代码我知道有一些findAndReplace（）我会需要努力让它在我的GUI中工作......但目前我只是想要说明ActionListener。

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.Collections; 

import javax.swing.*; 



public class HangmanPanel extends JPanel { 
    static Boolean FOUND; 
    private static final long serialVersionUID = -5793357804828609325L; 

    public static String answerKey() { 
     //get random array element 
     String array[] = new String[10]; 
     array[0] = "hamlet"; 
     array[1] = "mysts of avalon"; 
     array[2] = "the iliad"; 
     array[3] = "tales from edger allan poe"; 
     array[4] = "the children of hurin"; 
     array[5] = "the red badge of courage"; 
     array[6] = "of mice and men"; 
     array[7] = "utopia"; 
     array[8] = "chariots of the gods"; 
     array[9] = "a brief history of time"; 

     ArrayList<String> list = new ArrayList<String>(Arrays.asList(array)); 
     Collections.shuffle(list); 
     String s = list.get(0); 
     return s; 
    } 

    public StringBuilder dashReplace(String s) { 
     //replace non-white space char with dashes and creates StringBuilder Object 
     String tW = s.replaceAll("\\S", "-"); 
     System.out.print(tW + "\n"); 
     StringBuilder AnswerKey = new StringBuilder(tW); 
     return AnswerKey; 
    } 





    public HangmanPanel(){ 
     this.setLayout(null); 

     JLabel heading = new JLabel("Welcome to the Hangman App"); 
     JButton Button = new JButton("Ok"); 
     //get input 
     Button.addActionListener(new input()); 

     JLabel tfLable = new JLabel("Please Enter a Letter:"); 


     JLabel AnswerKey = new JLabel(dashReplace(answerKey()).toString()); 

     JTextField text = new JTextField(10); 


     heading.setSize(200, 50); 
     tfLable.setSize(150, 50); 
     text.setSize(50, 30); 
     Button.setSize(60, 20); 
     AnswerKey.setSize(200, 100); 

     heading.setLocation(300, 10); 
     tfLable.setLocation(50, 40); 
     text.setLocation(50, 80); 
     Button.setLocation(100, 85); 
     AnswerKey.setLocation(100,85); 

     this.add(heading); 
     this.add(tfLable); 
     this.add(text); 
     this.add(Button); 
     this.add(AnswerKey); 
    } 
    public class input implements ActionListener{ 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      // can't access text 
      sc = text.getText(); 
      char ch = sc.charAt(0); 
      findAndReplace(s, AnswerKey, input, ch); 
     } 


    } 
    public static int findAndReplace(String s, StringBuilder AnswerKey, String sc, 
      char ch) { 
     //find position of user input and replace 
     int pos = -1; 
     FOUND = false; 
     while(true){ 
     pos = s.indexOf(sc, pos+1); 
     if(pos < 0){ 

      break; 
     }else{ 
      FOUND = true; 
      AnswerKey.setCharAt(pos, ch); 
     } 

     } 
     System.out.println(AnswerKey); 
     return pos; 
    } 

} 

Answer 1

先不要使用小写类名和大写的变量名，你的代码是真的很难看。

您可以使用匿名内部类添加事件监听器是这样的：

final JTextField text = new JTextField(10); 

Answer 2

文字JTextField的变量声明构造函数的内部，是不可见的类的其他方法，因为它不具有类“范围”。您需要通过在类中声明该变量来使该变量成为类字段，而不是构造函数，以便在整个课程中提供该变量的可见性。

例如，所有的

public class HangmanPanel extends JPanel { 
    private static final long serialVersionUID = -5793357804828609325L; 
    private Boolean found; // this should not be static nor capitalized 
    private JTextField text; // declare your class field 

    // .... etc... 

    public HangmanPanel() { 
     this.setLayout(null); // *** don't do this. Use layout managers. 

     // ... etc 

     // JTextField text = new JTextField(10); 
     text = new JTextField(10);