在 JButton 中显示 if 语句 setText

Question

我正在创建游戏，并尝试使用 setText 方法在 JButton 中显示答案。这就是我尝试用按钮做的

enter code here btnAnswer3 = new JButton(setQuestion);

这是我正在尝试使用的方法

enter code here public void setQuestion()
{
    if (textAreaQuestion.equals("Which Prime Minister of England was from Huddersfield?")){
        btnAnswer3.setText("C. Harold Wilson");
    }   else{
        if (textAreaQuestion.equals("Where did Bruce Lee open his first Martial Arts School?")){
            btnAnswer3.setText("C. Seattle");
        } else{
            if (textAreaQuestion.equals("Who was the Prime Minister of England in 1940?")){
                btnAnswer3.setText("C. Winston Churchill");
            }
        }
    }
}

有人可以告诉我为什么这不起作用以及如何使用我的代码完成它。

这是 textAreaQuestion 的代码

enter code here textAreaQuestion = new JTextArea();
    textAreaQuestion.setEditable(false);
    questions.setViewportView(textAreaQuestion);

这是另一个 class

中的问题代码

enter code here private ArrayList<QuestionDetails> Questions = new ArrayList<QuestionDetails>();





public Questions()
{
    Questions.add(new QuestionDetails("Which Prime Minister of England was from Huddersfield?","Winston Churchill","Tony Blair","Harold Macmillon"));
    Questions.add(new QuestionDetails("Who was the Prime Minister of England in 1940?","John Kennedy","Harold Wilson","Harold Macmillon")); 
    Questions.add(new QuestionDetails("Where did Bruce Lee open his first Martial Arts School?","Baltimore","Hong Kong","Hollywood"));
}


public QuestionDetails generateResponse()
{
    Random r = new Random();
    int index = r.nextInt(Questions.size());
    return Questions.get(index);
}

这是它在 GUI 中的显示方式 class

enter code here displayQuestion();
    displayAnswer1();
    displayAnswer2();
    displayAnswer4();

    //This code will display the question and answers
}

这是 GUI 中问题代码的下一部分 class

enter code here public void displayQuestion()
{
    QuestionDetails q = questHandler.generateResponse();
    String question = q.getQuestion();
    textAreaQuestion.setText(question);
    //This will display the array of questions

}

此致，

Answer 1

如果 textAreaQuestion 是 JTextArea 你必须做 textAreaQuestion.getText()

所以：

if (textAreaQuestion.getText().equals("Which Prime Minister of England was from Huddersfield?"))

Answer 2

它不起作用的原因是因为数组已用于答案。在这种情况下，setText 方法将没有任何用处。

Questions.add(new QuestionDetails("Which Prime Minister of England was from Huddersfield?","Winston Churchill","Tony Blair","Harold Macmillon"));
Questions.add(new QuestionDetails("Who was the Prime Minister of England in 1940?","John Kennedy","Harold Wilson","Harold Macmillon")); 
Questions.add(new QuestionDetails("Where did Bruce Lee open his first Martial Arts School?","Baltimore","Hong Kong","Hollywood"));}

public QuestionDetails generateResponse(){   Random r = new Random();
int index = r.nextInt(Questions.size());
return Questions.get(index);}

解决这个问题的方法是像这样从数组中删除答案

enter code here Questions.add(new QuestionDetails("Which Prime Minister of England was from Huddersfield?"));
    Questions.add(new QuestionDetails("Who was the Prime Minister of England in 1940?")); 
    Questions.add(new QuestionDetails("Where did Bruce Lee open his first Martial Arts School?")); }

那么这个方法就有效了

enter code here if (textAreaQuestion.getText().equals("Which Prime Minister of England was from Huddersfield?")){
                btnAnswer3.setText("C."+" Harold Wilson");
            }
                if (textAreaQuestion.getText().equals("Which Prime Minister of England was from Huddersfield?")){
                    btnAnswer1.setText("A."+" Tony Blair");
                }
                    if (textAreaQuestion.getText().equals("Which Prime Minister of England was from Huddersfield?")){
                        btnAnswer2.setText("B."+" Harold Wilson");
                    }
                        if (textAreaQuestion.getText().equals("Which Prime Minister of England was from Huddersfield?")){
                            btnAnswer4.setText("D."+" Harold Wilson");
                        }   else{
                    }

在 JButton 中显示 if 语句 setText

Display if statement setText in a JButton

java

eclipse

if-statement

jbutton

settext