许多操作的一个事件处理程序

Question

我正在努力了解如何减少我的代码，以便5个TextField输入全部指向一个事件处理程序类。这一切都有效，只是有很多重复。任何建议表示赞赏。

继承人的代码：

TextField studentIdTf = new TextField("Student ID"); 
    studentIdTf.setTooltip(new Tooltip("Enter unique Student ID")); 
    studentIdTf.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      try { 
       int studentIdTfInt = Integer.parseInt(studentIdTf.getText()); 
       System.out.println(studentIdTfInt); 
      } 
      catch(NumberFormatException ex) { 
       System.out.println("Please enter a number"); 
      } 
     } 
    }); 

    TextField quizTf = new TextField("Quiz"); 
    quizTf.setTooltip(new Tooltip("Enter Quiz score")); 
    quizTf.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      try { 
       int quizTfInt = Integer.parseInt(quizTf.getText()); 
       System.out.println(quizTfInt); 
      } 
      catch(NumberFormatException ex) { 
       System.out.println("Please enter a number"); 
      } 
     } 
    }); 

    TextField asg1Tf = new TextField("Assignment 1"); 
    asg1Tf.setTooltip(new Tooltip("Enter Assignment 1 score")); 
    asg1Tf.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      try { 
       int asg1TfInt = Integer.parseInt(asg1Tf.getText()); 
       System.out.println(asg1TfInt); 
       if (asg1TfInt < 0) { 
        throw new InputMismatchException(); 
       } 
       if (asg1TfInt > 100) { 
        throw new InputMismatchException(); 
       } 
      } 
      catch(NumberFormatException ex) { 
       System.out.println("Please enter a number"); 
      } 
      catch(InputMismatchException ex2) { 
       System.out.println("Enter a number within the range 0 - 100"); 
      } 
     } 
    }); 

    TextField asg2Tf = new TextField("Assignment 2"); 
    asg2Tf.setTooltip(new Tooltip("Enter Assignment 2 score")); 
    asg2Tf.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      try { 
       int asg2TfInt = Integer.parseInt(asg2Tf.getText()); 
       System.out.println(asg2TfInt); 
       if (asg2TfInt < 0) { 
        throw new InputMismatchException(); 
       } 
       if (asg2TfInt > 100) { 
        throw new InputMismatchException(); 
       } 
      } 
      catch(NumberFormatException ex) { 
       System.out.println("Please enter a number"); 
      } 
      catch(InputMismatchException ex2) { 
       System.out.println("Enter a number within the range 0 - 100"); 
      } 
     } 
    }); 

    TextField examTf = new TextField("Final Exam"); 
    examTf.setTooltip(new Tooltip("Enter Exam score")); 
    examTf.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      try { 
       int examTfInt = Integer.parseInt(examTf.getText()); 
       System.out.println(examTfInt); 
       if (examTfInt < 0) { 
        throw new InputMismatchException(); 
       } 
       if (examTfInt > 100) { 
        throw new InputMismatchException(); 
       } 
      } 
      catch(NumberFormatException ex) { 
       System.out.println("Please enter a number"); 
      } 
      catch(InputMismatchException ex2) { 
       System.out.println("Enter a number within the range 0 - 100"); 
      } 
     } 
    }); 

Answer 1

为什么不直接定义一个方法：

private TextField createTextField(String text, String tooltip) { 
    TextField textField = new TextField(text); 
    textField.setTooltip(new Tooltip(tooltip)); 
    textField.setOnAction(event -> { 
     try { 
      int value = Integer.parseInt(textField.getText()); 
      System.out.println(value); 
     } catch (NumberFormatException exc) { 
      System.out.println("Please enter a number"); 
     } 
    }); 
    return textField ; 
} 

，然后你可以做

TextField studentIdTf = createTextField("Student ID", "Enter Unique Student ID"); 
TextField quizTf = createTextField("Quiz", "Enter Quiz Score"); 
// etc etc