Java 在JButton中显示if语句setText

我正在创建一个游戏，并尝试使用setText方法在JButton中显示答案。这就是我试图用按钮做的

enter code here btnAnswer3 = new JButton(setQuestion);

这就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");
            }
        }
    }
}

有人能告诉我为什么这是不工作，以及它应该如何使用我的代码来完成

下面是文本区域问题的代码

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

这是另一个类中问题的代码

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GUI类中问题代码的下一部分

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

    //This code will display the question and answers
}

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

}

---

关于，

如果textAreaQuestion是

JTextArea

您必须执行

textAreaQuestion.getText（）

因此：

---

它不起作用的原因是因为答案使用了数组。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);}

要解决这个问题，您需要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?")); }

那么这个方法就会有效地工作

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{
                    }

---

textAreaQuestion是字符串吗？

textAreaQuestion

的类型是什么？它被声明为私有JTextArea textAreaQuestion；不，对不起。它只留下空按钮，您可以编辑您的问题并将代码张贴在您正在设置的

textAreaQuestion

？

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{
                    }