尝试在java netbeans中构建一个按钮

我正在尝试制作一个程序，但我有一个问题。我正在尝试制作“下一步”按钮，但它会显示最后一个“soal”和最后一个“jawaban”。我想在按下“下一步”按钮时看到每个soal。我上传了这个屏幕截图和我的代码

    /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package guiandtests1;

import static guiandtests1.NewJFrame.answer1;
import static guiandtests1.NewJFrame.answer2;
import static guiandtests1.NewJFrame.answer3;
import static guiandtests1.NewJFrame.answer4;
import static guiandtests1.NewJFrame.question;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

/**
 *
 * @author abc
 */
public class Guiandtests1 {




    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws ParseException, IOException {
        NewJFrame form = new NewJFrame();
        form.setVisible(true);

        JSONParser parser = new JSONParser();
        Object obj = null;

            obj = parser.parse(new FileReader("c:\\Matematika.json"));


  JSONObject jsonObject = (JSONObject) obj;
  JSONArray array = (JSONArray) jsonObject.get("data"); // it should be any array name

     Iterator<Object> iterator = array.iterator();
        while (iterator.hasNext() ) {

            JSONObject element=(JSONObject)iterator.next();

            System.out.println(element.get("soal"));

            question=(String) element.get("soal");
            JSONArray abc = (JSONArray) element.get("jawaban");

            Iterator<Object> iterator1 = abc.iterator();

            ArrayList<String> results = new ArrayList<>();

            while (iterator1.hasNext()) {
                results.add(iterator1.next().toString());
                //System.out.println(iterator1.next());

                }

            System.out.println(results.get(0));
            System.out.println(results.get(1));
            answer1=results.get(0);
            answer2=results.get(1);
            answer3=results.get(2);
            answer4=results.get(3);
    }

}
}
    /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package guiandtests1;

import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

/**
 *
 * @author abc
 */
public class NewJFrame extends javax.swing.JFrame {
    public static String question;
    public static String answer1;
    public static String answer2;
    public static String answer3;
    public static String answer4;


    /**
     * Creates new form NewJFrame
     */
    public NewJFrame() {
        initComponents();
    }



    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setFont(new java.awt.Font("Microsoft YaHei", 0, 48)); // NOI18N
        jLabel1.setText("jLabel1");

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("jButton2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("jButton3");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jButton4.setText("jButton4");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        jButton5.setText("Next");
        jButton5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton5ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(157, 157, 157)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton4)
                    .addComponent(jButton3)
                    .addComponent(jButton2)
                    .addComponent(jButton1))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(121, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(115, 115, 115))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton5)
                        .addGap(18, 18, 18))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(29, 29, 29)
                .addComponent(jLabel1)
                .addGap(49, 49, 49)
                .addComponent(jButton1)
                .addGap(18, 18, 18)
                .addComponent(jButton2)
                .addGap(18, 18, 18)
                .addComponent(jButton3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton4)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 10, Short.MAX_VALUE)
                .addComponent(jButton5)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        //this.jButton1.setText(answer1);
    }                                        

    private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        jLabel1.setText(question);
        jButton1.setText(answer1);
        jButton2.setText(answer2);
        jButton3.setText(answer3);
        jButton4.setText(answer4);

    }                                        

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) throws IOException, ParseException {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
                  JSONParser parser = new JSONParser();
        Object obj = null;

            obj = parser.parse(new FileReader("c:\\Matematika.json"));


  JSONObject jsonObject = (JSONObject) obj;
  JSONArray array = (JSONArray) jsonObject.get("data"); // it should be any array name

     Iterator<Object> iterator = array.iterator();
        while (iterator.hasNext()) {
            JSONObject element=(JSONObject)iterator.next();

            System.out.println(element.get("soal"));
            JSONArray abc = (JSONArray) element.get("jawaban");
            Iterator<Object> iterator1 = abc.iterator();
            ArrayList<String> results = new ArrayList<>();
            while (iterator1.hasNext()) {
                results.add(iterator1.next().toString());
                //System.out.println(iterator1.next());

                }
            System.out.println(results.get(0));
            answer1=results.get(0);
            answer2=results.get(0);
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    }
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration                   

}

---

您的代码组织得非常糟糕。一个明显的问题是，您试图在输入文件的迭代中创建UI。虽然这种方法可以奏效，但通常这是一个非常糟糕的主意，这就是为什么你只看到一个问题的原因。更好的方法是先将文件中的数据读入内存中的数据结构，然后再对其进行处理

另一个问题是，您需要了解，并非所有事情都应该（甚至可以）使用可视化所见即所得设计器来完成。一大堆分开的

jButton3ActionPerformed

绝对是地狱之路

为什么有两个几乎相同的

main

方法

还有一点，我肯定你的

org.simple.json

，我使用了aka的一个，但我想提醒你，这远远不是最流行的json Java库

话虽如此，这是对代码的一些改进，这些改进工作得更好：

import org.json.simple.JSONArray；
导入org.json.simple.JSONObject；
导入org.json.simple.parser.JSONParser；
导入org.json.simple.parser.ParseException；
导入javax.swing.*；
导入java.awt.event.ActionEvent；
导入java.awt.event.ActionListener；
导入java.io.FileReader；
导入java.io.IOException；
导入java.util.*；
公共类NewJFrame扩展了javax.swing.JFrame{
公共静态类问题{
公共最终int id；
公开的最后一串问题；
公开最终字符串[]答案；
public int selectedAnswerIndex=-1；
公共问题（int-id、字符串问题、字符串[]答案）{
this.id=id；
这个问题=问题；
这个。答案=答案；
}
@凌驾
公共字符串toString（）{
返回“问题{”+
“id=”+id+
“，问题=”“+问题+”\”+
“，answers=“+Arrays.toString（answers）+
'}';
}
}
/**
*创建新表单NewJFrame
*/
公共NewJFrame（）{
初始化组件（）；
应答按钮。添加（jButton1）；
应答按钮。添加（jButton2）；
回答按钮。添加（jButton3）；
应答按钮。添加（jButton4）；
对于（int i=0；i{
"data":[
{
    "id":"1",
    "soal":"3 * 3 + 2 =",
    "jawaban":[
        "11",
        "15",
        "17",
        "19"
    ]

},
{
    "id":"2",
    "soal":"20 / 5 =",
    "jawaban":[
        "4",
        "3",
        "2",
        "1"
    ]
},
{
    "id":"3",
    "soal":"16 + 6 = ",
    "jawaban":[
        "22",
        "21",
        "20",
        "24"
    ]
},
{
    "id":"4",
    "soal":"2 * 4 =",
    "jawaban":[
        "8",
        "6",
        "10",
        "12"
    ]
},
{
    "id":"5",
    "soal":"1+4*2",
    "jawaban":[
        "8",
        "10",
        "12",
        "14"
    ]
},
{
    "id":"6",
    "soal":"Jika A+1=10 , B+A=11 C= ?",
    "jawaban":[
        "EGP",
        "1",
        "12",
        "22"
    ]
},
{
    "id":"7",
    "soal":"44/11",
    "jawaban":[
        "4",
        "2",
        "5",
        "8"
    ]
},
{
    "id":"8",
    "soal":"1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 = ",
    "jawaban":[
        "16",
        "15",
        "17",
        "10"
    ]
},
{
    "id":"9",
    "soal":"Berapakah jawaban sebelumnya ",
    "jawaban":[
        "16",
        "17",
        "18",
        "19"
    ]
}
]
}