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  1. #1
    carlos123 is offline Member
    Join Date
    Nov 2007
    Posts
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    Smile java assignment, need help bad.

    I have a programming assignement that i have been working on for quite some time now. I need your guys' help. My assignement is to great a table with data in it. and it will have a combobox and 2 buttons to how it will be sorted( run the program and you'll see how its setup).The table will have a comboBox that includes the 4 headings. We have to use insertion and selection sorting. I have done some of the program, just need help on getting up and running good. There will also be two buttons (0-9/A-Z ) and (9-0/Z-A). The user will choose by which heading the table should be sorted and then press the button as to how it will be sorted. When that button is pressed the table will be sorted and appear correctly with the correct information for each person. As 2 of the headings are Strings and 2 are integers, you will need to make the sorting of the Last name and age a selection sort and the sorting of the First name and test score insertion sorts. Check out the code, thanks for the help guys.

    Java Code:
    import java.util.*;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.JTable;
    import javax.swing.JComboBox.*;
    
    
    
    	
    
    public class Main implements ActionListener
    {
        JPanel p1;
        Object[] test;
           JFrame f1;
          JButton b1,b2;
             JTable table;
            JComboBox combo;
           Container c1;
          GP g1;
         JScrollPane scrollpane;
           public Main()
        {
               String[] columnNames = {"First Name","Last Name","Age","Test Scores"};
                 String[] combodata = {"First Name","Last Name","Age","Test Scores"};               
           // Smith       Dave        12      75
           // Johnson     Bill        14      72
           // Anderson    Sara        11      92
           // Hoyez       Kara        16      83
           // Cruz        Kyle        13      84
           String[] test = {"","","","",""};           
            b1=new JButton("0-9/A-Z");
            b2=new JButton("9-0/Z-A");
            b1.addActionListener(this);
            b2.addActionListener(this);
          combo = new JComboBox(combodata);
          combo.setSelectedIndex(3);
            combo.setEditable(false);
            combo.addActionListener(this);
           Object[][] rowData = {
                {"Dave", "Smith", new Integer(12), new Integer(75)},
                {"Bill", "Johnson", new Integer(14), new Integer(72)},
                {"Sara", "Anderson", new Integer(11), new Integer(92)},
                {"Kara", "Hoyez", new Integer(16), new Integer(83)},
                {"Kyle", "Cruz", new Integer(13), new Integer(84)}};           
    
           f1 = new JFrame();
             table = new JTable(rowData,columnNames);
           f1.setSize(400,170);
           c1 = f1.getContentPane();
           g1 = new GP(); 
           p1 = new JPanel();
           p1.setSize(400,170);
           
    //int[] intArray = new int[] {4, 1, 3, -23};
      //  Arrays.sort(intArray);
    //System.out.println(rowData[2][3]);
        
          
    
          p1.add(table);
       
    
          p1.add(combo);
          p1.add(b1);
          p1.add(b2);
           c1.add(p1);
           
           f1.show();
        }
            
        
    	public static void main(String[] args)
    	{
    	  Main pw = new Main();
         }
         public class GP extends JPanel
    {
       
          
      
          public GP()
        {
      
      
    }  
    }
        public void actionPerformed(ActionEvent event)
        {
    
            if (event.getSource() == b1){
            Object comboselect = combo.getSelectedItem(); 
           // if (comboselect.equals("First Name")){
           //  for(int i = 0;  i< 4; i++){ 
               // String get2d = rowData.get[0][i];
                // get2d = test[i];
                //}
                 ///insertion sort
                     // int[] test = {54,23,7,53,4};
                //for (int index = 0; index < test.length; index++){
                //    int key = test[index];
                 //   int position = index;
                    
                 //   while (position > 0 && test[position -1] > key){
                 //       test[position] = test[position-1];
                 //       position--;
                 //   }
                //    test[position] = key;
              //  }
                //selection sort
                //for (int index = 0; index < numbers.length-1; index++){
                  //  min=index;
                  //  for(int scan = index+1; scan < numbers.length; scan++){
                     //   if (numbers[scan] < numbers [min]){
                      //      min=scan;
                            
                            //swap values
                        //    temp = numbers[min];
                        //    numbeers[min] = numbers[index];
                        //    numbers[index] = temp;
                       // }
                   // }
                //}
                 //for (int index = 1; index < test.length; index++){
                //System.out.println(test[index]);
          //  }
            //}
            if (comboselect.equals("Last Name")){}
            if (comboselect.equals("Age")){}
            if (comboselect.equals("Test Scores")){}
                
            }
           
             if (event.getSource() == b2){
             Object comboselect = combo.getSelectedItem(); 
            if (comboselect.equals("First Name")){}
            if (comboselect.equals("Last Name")){}
            if (comboselect.equals("Age")){}
            if (comboselect.equals("Test Scores")){}  
                
            }  
              
           
             
           
        
        }
    }

  2. #2
    hardwired's Avatar
    hardwired is offline Senior Member
    Join Date
    Jul 2007
    Posts
    1,576
    Rep Power
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    Default

    Java Code:
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import javax.swing.*;
    import javax.swing.table.*;
    
    public class MainSortTest implements ActionListener
    {
        JButton b1,b2;
        JTable table;
        JComboBox combo;
    
        public MainSortTest()
        {
            String[] columnNames = {"First Name","Last Name","Age","Test Scores"};
            String[] combodata   = {"First Name","Last Name","Age","Test Scores"};
            // Smith       Dave        12      75
            // Johnson     Bill        14      72
            // Anderson    Sara        11      92
            // Hoyez       Kara        16      83
            // Cruz        Kyle        13      84
    //        String[] test = {"","","","",""};
            b1=new JButton("0-9/A-Z");
            b2=new JButton("9-0/Z-A");
            b1.addActionListener(this);
            b2.addActionListener(this);
            combo = new JComboBox(combodata);
            combo.setSelectedIndex(3);
            combo.setEditable(false);
            // The combo selectedIndex == table headerColumn index
            // so there is no need for an ActionListener.
    //        combo.addActionListener(this);
            Object[][] rowData = {
                {"Dave", "Smith",    new Integer(12), new Integer(75)},
                {"Bill", "Johnson",  new Integer(14), new Integer(72)},
                {"Sara", "Anderson", new Integer(11), new Integer(92)},
                {"Kara", "Hoyez",    new Integer(16), new Integer(83)},
                {"Kyle", "Cruz",     new Integer(13), new Integer(84)}
            };           
            table = new JTable(new DefaultTableModel(rowData,columnNames));
    
            JFrame f1 = new JFrame();
            f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            Container c1 = f1.getContentPane();
            c1.add(new JScrollPane(table));
            JPanel p1 = new JPanel();
    //        p1.setSize(400,170);
            p1.add(combo);
            p1.add(b1);
            p1.add(b2);
            c1.add(p1, "Last");
            f1.setSize(400,170);
            f1.setLocation(200,200);
            f1.setVisible(true);
        }
    
        public static void main(String[] args)
        {
            new MainSortTest();
        }
    
        public void actionPerformed(ActionEvent event)
        {
            int index = combo.getSelectedIndex();
            JButton button = (JButton)event.getSource();
            boolean ascending = button == b1;
            if(index < 2)
                sortStrings(index, ascending);
            else
                sortIntegers(index, ascending);
        }
    
        private void sortStrings(int col, boolean ascending)
        {
            // Collect the values in the column.
            TableModel model = table.getModel();
            String[] colValues = new String[model.getRowCount()];
            int[] rowIndices = new int[model.getRowCount()];
            for(int j = 0; j < colValues.length; j++)
            {
                colValues[j] = (String)model.getValueAt(j, col);
                rowIndices[j] = j;
            }
    
            // Sort both arrays.
            for(int j = 0; j < colValues.length; j++)
            {
                String datum = colValues[j];
                int replaceIndex = j;
                for(int k = j+1; k < colValues.length; k++)
                {
                    int n = colValues[k].compareTo(datum);
                    if( (ascending && n < 0) || (!ascending && n > 0) )
                    {
                        datum = colValues[k];
                        replaceIndex = k;
                    }
    
                }
                if(replaceIndex != j)
                {
                    String temp = colValues[j];
                    colValues[j] = colValues[replaceIndex];
                    colValues[replaceIndex] = temp;
                    int tempIndex = rowIndices[j];
                    rowIndices[j] = rowIndices[replaceIndex];
                    rowIndices[replaceIndex] = tempIndex;
                }
            }
            sortRows(rowIndices);
        }
    
        private void sortIntegers(int col, boolean ascending)
        {
            TableModel model = table.getModel();
            Integer[] colValues = new Integer[model.getRowCount()];
            int[] rowIndices = new int[model.getRowCount()];
            for(int j = 0; j < colValues.length; j++)
            {
                colValues[j] = (Integer)model.getValueAt(j, col);
                rowIndices[j] = j;
            }
    
            // Sort arrays.
            for(int j = 0; j < colValues.length; j++)
            {
                Integer datum = colValues[j];
                int replaceIndex = j;
                for(int k = j+1; k < colValues.length; k++)
                {
                    int n = colValues[k].compareTo(datum);
                    if( (ascending && n < 0) || (!ascending && n > 0) )
                    {
                        datum = colValues[k];
                        replaceIndex = k;
                    }
    
                }
                if(replaceIndex != j)
                {
                    Integer temp = colValues[j];
                    colValues[j] = colValues[replaceIndex];
                    colValues[replaceIndex] = temp;
                    int tempIndex = rowIndices[j];
                    rowIndices[j] = rowIndices[replaceIndex];
                    rowIndices[replaceIndex] = tempIndex;
                }
            }
            sortRows(rowIndices);
        }
    
        private void sortRows(int[] indices)
        {
            Object[][] data = getSortedData(indices);
            Object[] colIds = getColumnIdentifiers();
            DefaultTableModel model = (DefaultTableModel)table.getModel();
            model.setDataVector(data, colIds);
            model.fireTableStructureChanged();
        }
    
        private Object[][] getSortedData(int[] indices)
        {
            DefaultTableModel model = (DefaultTableModel)table.getModel();
            int rows = model.getRowCount();
            int cols = model.getColumnCount();
            Object[][] data = new Object[rows][cols];
            for(int j = 0; j < rows; j++)
            {
                for(int k = 0; k < cols; k++)
                    data[j][k] = model.getValueAt(indices[j], k);
            }
            return data;
        }
    
        private Object[] getColumnIdentifiers()
        {
            TableColumnModel model = table.getColumnModel();
            int cols = model.getColumnCount();
            Object[] colIds = new Object[cols];
            for(int j = 0; j < cols; j++)
                colIds[j] = model.getColumn(j).getIdentifier();
            return colIds;
        }
    }

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