Java 向JTable添加列时出现NullPointerException

我正在编写一个程序，在输入医生编号（FHIR HAPI）时显示患者记录，但这不是重点。我想显示基本的患者详细信息，然后通过一个复选框，允许用户向JTable添加一个额外的列来显示他们的详细信息

根据复选框的状态，可以添加和删除此额外列。但是，当我尝试使用我的

DefaultTableModel

变量执行

model.addColumn（）

方法时，我总是得到一个

NullPointer

异常

最后一种方法是产生问题的方法。我还为调用的其他方法提供了代码。我曾尝试对值甚至数组列表使用各种类型的数组（对象和字符串）。您还将看到，在我为方法

getAllPatientToServationValues（）

编写的第二段代码中，我执行了一个println，以查看它是否进入该方法，而不是。任何帮助都将不胜感激

import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionListener;
import java.text.ParseException;

public class GUIManager extends JFrame{

    private Operations op;

    private JPanel pnPnlMain;

    private JPanel pnPnlTop;
    private JCheckBox cbChkCholesterol;

    private JPanel pnPnlMiddle;
    private JTable tblLeft;
    private DefaultTableModel tblLeftModel;
    private JTable tblRight;
    private DefaultTableModel tblRightModel;
    private JButton btBtnAdd;
    private JButton btBtnRemove;

    private JPanel pnPnlBottom;
    private JButton btBtnExit;
    private JLabel lbLblTime;
    private JTextField tfTxtSeconds;
    private JLabel lbLblThreshhold;
    private JTextField tfTxtThreshold;

    public GUIManager(Operations inOP)
    {
        setSize(1000, 650);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("FHIR Patient Monitor");

        pnPnlMain = new JPanel();
        pnPnlMain.setBorder( BorderFactory.createTitledBorder( "FHIR" ) );
        GridBagLayout gbPnlMain = new GridBagLayout();
        GridBagConstraints gbcPnlMain = new GridBagConstraints();
        pnPnlMain.setLayout( gbPnlMain );

        pnPnlTop = new JPanel();
        pnPnlTop.setBorder( BorderFactory.createTitledBorder( "Column Details" ) );
        GridBagLayout gbPnlTop = new GridBagLayout();
        GridBagConstraints gbcPnlTop = new GridBagConstraints();
        pnPnlTop.setLayout( gbPnlTop );

        cbChkCholesterol = new JCheckBox( "Cholesterol");
        gbcPnlTop.gridx = 2;
        gbcPnlTop.gridy = 1;
        gbcPnlTop.gridwidth = 6;
        gbcPnlTop.gridheight = 1;
        gbcPnlTop.fill = GridBagConstraints.BOTH;
        gbcPnlTop.weightx = 1;
        gbcPnlTop.weighty = 0;
        gbcPnlTop.anchor = GridBagConstraints.NORTH;
        gbPnlTop.setConstraints( cbChkCholesterol, gbcPnlTop );
        pnPnlTop.add( cbChkCholesterol );
        gbcPnlMain.gridx = 0;
        gbcPnlMain.gridy = 0;
        gbcPnlMain.gridwidth = 20;
        gbcPnlMain.gridheight = 4;
        gbcPnlMain.fill = GridBagConstraints.BOTH;
        gbcPnlMain.weightx = 1;
        gbcPnlMain.weighty = 0;
        gbcPnlMain.anchor = GridBagConstraints.NORTH;
        gbPnlMain.setConstraints( pnPnlTop, gbcPnlMain );
        pnPnlMain.add( pnPnlTop );

        pnPnlMiddle = new JPanel();
        pnPnlMiddle.setBorder( BorderFactory.createTitledBorder( "Tables" ) );
        GridBagLayout gbPnlMiddle = new GridBagLayout();
        GridBagConstraints gbcPnlMiddle = new GridBagConstraints();
        pnPnlMiddle.setLayout( gbPnlMiddle );

        String [][]dataTblLeft = new String[1][2];
        String []colsTblLeft = new String[] { "ID", "Full Name" };
        tblLeftModel = new DefaultTableModel(dataTblLeft, colsTblLeft);
        tblLeft = new JTable(tblLeftModel);
        tblLeftModel.removeRow(0);
        JScrollPane scpLeftTable = new JScrollPane(tblLeft);
        scpLeftTable.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
        scpLeftTable.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        gbcPnlMiddle.gridx = 0;
        gbcPnlMiddle.gridy = 0;
        gbcPnlMiddle.gridwidth = 9;
        gbcPnlMiddle.gridheight = 12;
        gbcPnlMiddle.fill = GridBagConstraints.NONE;
        gbcPnlMiddle.weightx = 1;
        gbcPnlMiddle.weighty = 1;
        gbcPnlMiddle.anchor = GridBagConstraints.CENTER;
        gbPnlMiddle.setConstraints( scpLeftTable, gbcPnlMiddle );
        pnPnlMiddle.add(scpLeftTable);

        String [][]dataTblRight = new String[1][7] ;
        String []colsTblRight = new String[] { "ID", "Full Name", "Birthdate","Gender","City","State","Country"};
        tblRightModel = new DefaultTableModel(dataTblRight, colsTblRight);
        tblRight = new JTable(tblRightModel);
        tblRight.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        tblRightModel.removeRow(0);
        JScrollPane scpRightTable = new JScrollPane(tblRight);
        scpRightTable.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
        scpRightTable.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        gbcPnlMiddle.gridx = 10;
        gbcPnlMiddle.gridy = 0;
        gbcPnlMiddle.gridwidth = 9;
        gbcPnlMiddle.gridheight = 12;
        gbcPnlMiddle.fill = GridBagConstraints.NONE;
        gbcPnlMiddle.weightx = 1;
        gbcPnlMiddle.weighty = 1;
        gbcPnlMiddle.anchor = GridBagConstraints.CENTER;
        gbPnlMiddle.setConstraints( scpRightTable, gbcPnlMiddle );
        pnPnlMiddle.add( scpRightTable );

        btBtnAdd = new JButton( "Add"  );
        gbcPnlMiddle.gridx = 2;
        gbcPnlMiddle.gridy = 12;
        gbcPnlMiddle.gridwidth = 5;
        gbcPnlMiddle.gridheight = 2;
        gbcPnlMiddle.fill = GridBagConstraints.NONE;
        gbcPnlMiddle.weightx = 1;
        gbcPnlMiddle.weighty = 0;
        gbcPnlMiddle.anchor = GridBagConstraints.NORTH;
        gbPnlMiddle.setConstraints( btBtnAdd, gbcPnlMiddle );
        pnPnlMiddle.add( btBtnAdd );

        btBtnRemove = new JButton( "Remove"  );
        gbcPnlMiddle.gridx = 12;
        gbcPnlMiddle.gridy = 12;
        gbcPnlMiddle.gridwidth = 5;
        gbcPnlMiddle.gridheight = 2;
        gbcPnlMiddle.fill = GridBagConstraints.NONE;
        gbcPnlMiddle.weightx = 1;
        gbcPnlMiddle.weighty = 0;
        gbcPnlMiddle.anchor = GridBagConstraints.NORTH;
        gbPnlMiddle.setConstraints( btBtnRemove, gbcPnlMiddle );
        pnPnlMiddle.add( btBtnRemove );
        gbcPnlMain.gridx = 0;
        gbcPnlMain.gridy = 4;
        gbcPnlMain.gridwidth = 20;
        gbcPnlMain.gridheight = 15;
        gbcPnlMain.fill = GridBagConstraints.BOTH;
        gbcPnlMain.weightx = 1;
        gbcPnlMain.weighty = 0;
        gbcPnlMain.anchor = GridBagConstraints.NORTH;
        gbPnlMain.setConstraints( pnPnlMiddle, gbcPnlMain );
        pnPnlMain.add( pnPnlMiddle );

        pnPnlBottom = new JPanel();
        GridBagLayout gbPnlBottom = new GridBagLayout();
        GridBagConstraints gbcPnlBottom = new GridBagConstraints();
        pnPnlBottom.setLayout( gbPnlBottom );

        btBtnExit = new JButton( "Exit"  );
        gbcPnlBottom.gridx = 16;
        gbcPnlBottom.gridy = 0;
        gbcPnlBottom.gridwidth = 4;
        gbcPnlBottom.gridheight = 2;
        gbcPnlBottom.fill = GridBagConstraints.NONE;
        gbcPnlBottom.weightx = 1;
        gbcPnlBottom.weighty = 0;
        gbcPnlBottom.anchor = GridBagConstraints.EAST;
        gbPnlBottom.setConstraints( btBtnExit, gbcPnlBottom );
        pnPnlBottom.add( btBtnExit );

        lbLblTime = new JLabel( "Refresh Rate:"  );
        gbcPnlBottom.gridx = 0;
        gbcPnlBottom.gridy = 0;
        gbcPnlBottom.gridwidth = 6;
        gbcPnlBottom.gridheight = 1;
        gbcPnlBottom.fill = GridBagConstraints.BOTH;
        gbcPnlBottom.weightx = 1;
        gbcPnlBottom.weighty = 1;
        gbcPnlBottom.anchor = GridBagConstraints.NORTH;
        gbPnlBottom.setConstraints( lbLblTime, gbcPnlBottom );
        pnPnlBottom.add( lbLblTime );

        tfTxtSeconds = new JTextField( );
        gbcPnlBottom.gridx = 6;
        gbcPnlBottom.gridy = 0;
        gbcPnlBottom.gridwidth = 8;
        gbcPnlBottom.gridheight = 1;
        gbcPnlBottom.fill = GridBagConstraints.BOTH;
        gbcPnlBottom.weightx = 1;
        gbcPnlBottom.weighty = 0;
        gbcPnlBottom.anchor = GridBagConstraints.WEST;
        gbPnlBottom.setConstraints( tfTxtSeconds, gbcPnlBottom );
        pnPnlBottom.add( tfTxtSeconds );

        lbLblThreshhold = new JLabel( "Threshold:"  );
        gbcPnlBottom.gridx = 0;
        gbcPnlBottom.gridy = 1;
        gbcPnlBottom.gridwidth = 6;
        gbcPnlBottom.gridheight = 1;
        gbcPnlBottom.fill = GridBagConstraints.BOTH;
        gbcPnlBottom.weightx = 1;
        gbcPnlBottom.weighty = 1;
        gbcPnlBottom.anchor = GridBagConstraints.NORTH;
        gbPnlBottom.setConstraints( lbLblThreshhold, gbcPnlBottom );
        pnPnlBottom.add( lbLblThreshhold );

        tfTxtThreshold = new JTextField( );
        gbcPnlBottom.gridx = 6;
        gbcPnlBottom.gridy = 1;
        gbcPnlBottom.gridwidth = 8;
        gbcPnlBottom.gridheight = 1;
        gbcPnlBottom.fill = GridBagConstraints.BOTH;
        gbcPnlBottom.weightx = 1;
        gbcPnlBottom.weighty = 0;
        gbcPnlBottom.anchor = GridBagConstraints.NORTH;
        gbPnlBottom.setConstraints( tfTxtThreshold, gbcPnlBottom );
        pnPnlBottom.add( tfTxtThreshold );
        gbcPnlMain.gridx = 0;
        gbcPnlMain.gridy = 19;
        gbcPnlMain.gridwidth = 20;
        gbcPnlMain.gridheight = 2;
        gbcPnlMain.fill = GridBagConstraints.BOTH;
        gbcPnlMain.weightx = 1;
        gbcPnlMain.weighty = 0;
        gbcPnlMain.anchor = GridBagConstraints.NORTH;
        gbPnlMain.setConstraints( pnPnlBottom, gbcPnlMain );
        pnPnlMain.add( pnPnlBottom );

        getContentPane().add(pnPnlMain);
    }

    public void addExitListener(ActionListener listen)
    {
        btBtnExit.addActionListener(listen);
    }

    public void addAddListener(ActionListener listen)
    {
        btBtnAdd.addActionListener(listen);
    }

    public void addRemoveListener(ActionListener listen)
    {
        btBtnRemove.addActionListener(listen);
    }

    public void addCholesterolListener(ActionListener listen) { cbChkCholesterol.addActionListener(listen);}

    public JCheckBox getChkCholesterol() { return cbChkCholesterol;}

    public DefaultTableModel getRightTableModel()
    {
        return this.tblRightModel;
    }

    public DefaultTableModel getLeftTableModel()
    {
        return this.tblLeftModel;
    }

    public JTable getLeftTable()
    {
        return this.tblLeft;
    }

    public JTable getRightTable()
    {
        return this.tblRight;
    }

    public void addRowToRightTable(Object[] newData)
    {
        tblRightModel.insertRow(tblRight.getRowCount(), newData);
    }

    public void populateLeftTable(String[][] data)
    {
        for(int i = 0; i < data.length; i++)
        {
            Object[] tempData = data[i];
            tblLeftModel.insertRow(tblLeft.getRowCount(), tempData);
        }
    }

    public void addColumnToRightTable(String code) throws ParseException {
        tblRightModel.addColumn("Cholesterol",op.getAllPatientObservationValues(code));
    }
}

import javax.swing.*；
导入javax.swing.table.DefaultTableModel；
导入java.awt.GridBagConstraints；
导入java.awt.GridBagLayout；
导入java.awt.event.ActionListener；
导入java.text.ParseException；
公共类GUIManager扩展了JFrame{
私人业务处；
私人JPanel PNLMAIN；
私人JPanel PNLTOP；
私人JCheckBox cbChkCholesterol；
私人JPanel PNLMIDLE；
私人JTable-tblLeft；
私有DefaultTableModel-tblLeftModel；
专用JTable tblRight；
私有DefaultTableModel tblRightModel；
私人按钮；
私人按钮btBtnRemove；
私人JPanel PNLBOTOM；
私人JButton btnexit；
私人JLabel lbLblTime；
专用JTextField tfTxtSeconds；
私人JLabel lblthreshhold；
私有JTextField tfTxtThreshold；
公共管理人员（操作不操作）
{
设置大小（1000650）；
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
setTitle（“FHIR患者监护仪”）；
pnlmain=new JPanel（）；
pnlmain.setboorder（BorderFactory.createTitledBorder（“FHIR”）；
GridBagLayout gbPnlMain=新的GridBagLayout（）；
GridBagConstraints gbcPnlMain=新的GridBagConstraints（）；
pnlmain.setLayout（gbPnlMain）；
pnltop=新的JPanel（）；
pnltop.setboorder（BorderFactory.createTitledBorder（“列详细信息”）；
GridBagLayout gbPnlTop=新的GridBagLayout（）；
GridBagConstraints gbcPnlTop=新的GridBagConstraints（）；
pnltop.setLayout（gbpntop）；
cbChkCholesterol=新的JCheckBox（“胆固醇”）；
gbcPnlTop.gridx=2；
gbcPnlTop.gridy=1；
gbcPnlTop.gridwidth=6；
gbcPnlTop.gridheight=1；
gbcPnlTop.fill=GridBagConstraints.BOTH；
gbcPnlTop.weightx=1；
gbcPnlTop.weighty=0；
gbcPnlTop.anchor=gridbagstraints.NORTH；
gbPnlTop.setConstraints（cbChkCholesterol，gbcPnlTop）；
PNLTOP.add（CBCHKC胆固醇）；
gbcPnlMain.gridx=0；
gbcPnlMain.gridy=0；
gbcPnlMain.gridwidth=20；
gbcPnlMain.gridheight=4；
gbcPnlMain.fill=GridBagConstraints.BOTH；
gbcPnlMain.weightx=1；
gbcPnlMain.weighty=0；
gbcPnlMain.anchor=gridbagstraints.NORTH；
gbPnlMain.setConstraints（pnltop，gbcPnlMain）；
pnlmain.add（pnltop）；
pnlmidle=new JPanel（）；
pnlmidle.setboorder（BorderFactory.createTitledBorder（“表”）；
GridBagLayout GBPNLMIDLE=新的GridBagLayout（）；
GridBagConstraints gbcPnlMiddle=新的GridBagConstraints（）；
pnlmidle.setLayout（gbpnnlmiddle）；
字符串[][]dataTblLeft=新字符串[1][2]；
String[]colsTblLeft=新字符串[]{“ID”，“全名”}；
tblLeftModel=新的DefaultTableModel（dataTblLeft，colsTblLeft）；
tblLeft=新的JTable（tblLeft模型）；
tBlletModel.removeRow（0）；
JScrollPane scpLeftTable=新的JScrollPane（tblLeft）；
scpLeftTable.setHorizontalScrollBarPolicy（ScrollPaneConstants.HorizontalScrollBar\uAlways）；
scpLeftTable.setVerticalScrollBarPolicy（ScrollPaneConstants.VERTICAL\u SCROLLBAR\u ALWAYS）；
gbcPnlMiddle.gridx=0；
gbcPnlMiddle.gridy=0；
gbcPnlMiddle.gridwidth=9；
gbcPnlMiddle.gridheight=12；
gbcPnlMiddle.fill=GridBagConstraints.NONE；
gbcPnlMiddle.weightx=1；
gbcPnlMiddle.weighty=1；
gbcPnlMiddle.anchor=GridBagConstraints.CENTER；
gbPnlMiddle.setConstraints（scpleftable，gbcPnlMiddle）；
pnlmidle.add（scpLeftTable）；
字符串[][]dataTblRight=新字符串[1][7]；
String[]colsTblRight=新字符串[]{“ID”、“全名”、“出生日期”、“性别”、“城市”、“州”、“国家”}；
tblRightModel=新的DefaultTableModel（dataTblRight，colsTblRight）；
tblRight=新JTable（tblRight模型）；
tblRight.setAutoResizeMode（JTable.AUTO_RESIZE_OFF）；
tblRightModel.removeRow（0）；
JScrollPane scpRightTable=新的JScrollPane（tblRight）；
scpRightTable.setHorizontalScrollBarPolicy（ScrollPaneConstants.HorizontalScrollBar\uAlways）；
scpRightTable.setVerticalScrollBarPolicy（ScrollPaneConstants.VERTICAL\u SCROLLBAR\u ALWAYS）；
gbcPnlMiddle.gridx=10；
gbcPnlMiddle.gridy=0；
gbcPnlMiddle.gridwidth=9；
gbcPnlMiddle.gridheight=12；
gbcPnlMiddle.fill=GridBagConstraints.NONE；
gbcPnlMiddle.weightx=1；
gbcPnlMiddle.weighty=1；
gbcPnlMiddle.anchor=GridBagConstraints.CENTER；
gbPnlMiddle.setConstraints（scpRightTable、gbcPnlMiddle）；
pnlmidle.add（scpRightTable）；
BTNADD=新的JButton（“添加”）；
gbcPnlMiddle.gridx=2；
gbcPnlMiddle.gridy=12；
gbcPnlMiddle.gridwidth=5；
gbcPnlMiddle.gridheight=2；
gbcPnlMiddle.fill=GridBagConstraints.NONE；
gbcPnlMiddl
public Object[] getAllPatientObservationValues(String code) throws ParseException {
        System.out.println("In this method");
        ArrayList<String> values = new ArrayList<>();
        for (int i = 0; i < allPatients.size(); i++)
        {
            values.add(allPatients.get(i).getObservationValue(code));
        }
        return values.toArray();
    }

    public GUIManager(Operations inOP)
    {
        setSize(1000, 650);

    public GUIManager(Operations inOP)
    {
        op = inOP;
        setSize(1000, 650);