[英]setting the data of the next column in jtable in java
大家好 我想問一下,如何設置下一個列的值? 在這里,我有一個計數器“ counter”,它在sampleTable中添加了真實布爾值的數量。 我想做的是在表的下一列中為“總計”設置數據值。 “總計”數據應為計數器值。 我該怎么辦?
private void tableTest(){
int nRow = sampleTable.getRowCount();
int nCol = sampleTable.getColumnCount();
int counter = 0;
Object[][] tableData = new Object[nRow][nCol];
for (int i = 0 ; i < nRow ; i++){
for (int j = 3 ; j < nCol ; j++){
tableData[i][j] = sampleTable.getValueAt(i,j);
System.out.println(tableData[i][j]);
if(tableData[i][j] != null && tableData[i][j].equals(true)){
counter++;
}
}
/* if(nCol == 7){
sampleTable.setValueAt(i, 7, counter);
}else{
tableData = new Object[nRow][nCol + 1];
sampleTable.setValueAt(i, 7, counter);
}*/
System.out.println(counter);
sampleTable.setValueAt(i,7,counter);
counter = 0;
}
}
沒有更多的事情要做,就不可能知道1.您要做什么和2.您可能做錯了什么...
以下示例非常簡單。 它的作用是讓您對表進行更改,然后單擊“更新”按鈕,然后進行遍歷並計算每一行的總數...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TallyTableTest {
public static void main(String[] args) {
new TallyTableTest();
}
public TallyTableTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
try {
final MyTableModel model = new MyTableModel();
loadData(model);
JTable table = new JTable(model);
JButton update = new JButton("Update");
update.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (int row = 0; row < model.getRowCount(); row++) {
int counter = 0;
for (int col = 3; col < 7; col++) {
Object value = model.getValueAt(row, col);
if (value instanceof Boolean && (boolean)value) {
counter++;
}
}
model.setValueAt(counter, row, 7);
}
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.add(update, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (IOException exp) {
exp.printStackTrace();
}
}
});
}
public void loadData(MyTableModel model) throws IOException {
// Fill your model here
}
public static class MyTableModel extends AbstractTableModel {
protected static final String[] COLUMNS = new String[]{
"ID", "First Name", "Last Name", "1", "2", "3", "4", "total"
};
protected static final Class[] COLUMN_TYPES = new Class[]{
Integer.class, String.class, String.class,
Boolean.class, Boolean.class, Boolean.class, Boolean.class,
Integer.class
};
private List<Object[]> rows;
public MyTableModel() {
rows = new ArrayList<>(25);
}
public void addRow(Object[] data) {
rows.add(data);
}
@Override
public int getRowCount() {
return rows.size();
}
@Override
public int getColumnCount() {
return COLUMNS.length;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return COLUMN_TYPES[columnIndex];
}
@Override
public String getColumnName(int column) {
return COLUMNS[column];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object[] row = rows.get(rowIndex);
return row[columnIndex];
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
Object[] row = rows.get(rowIndex);
row[columnIndex] = aValue;
fireTableCellUpdated(rowIndex, columnIndex);
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex >= 3 && columnIndex <= 6;
}
}
}
該示例的作用是實時更新總數。 這意味着每次更改行的列值時,它都會重新計算該行總數並在內部更新模型。
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TallyTableTest {
public static void main(String[] args) {
new TallyTableTest();
}
public TallyTableTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
try {
final MyTableModel model = new MyTableModel();
loadData(model);
JTable table = new JTable(model);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (IOException exp) {
exp.printStackTrace();
}
}
});
}
public void loadData(MyTableModel model) throws IOException {
// Fill your model here...
}
public static class MyTableModel extends AbstractTableModel {
protected static final String[] COLUMNS = new String[]{
"ID", "First Name", "Last Name", "1", "2", "3", "4", "total"
};
protected static final Class[] COLUMN_TYPES = new Class[]{
Integer.class, String.class, String.class,
Boolean.class, Boolean.class, Boolean.class, Boolean.class,
Integer.class
};
private List<Object[]> rows;
public MyTableModel() {
rows = new ArrayList<>(25);
}
public void addRow(Object[] data) {
rows.add(data);
}
@Override
public int getRowCount() {
return rows.size();
}
@Override
public int getColumnCount() {
return COLUMNS.length;
}
@Override
public Class<?> getColumnClass(int columnIndex) {
return COLUMN_TYPES[columnIndex];
}
@Override
public String getColumnName(int column) {
return COLUMNS[column];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object[] row = rows.get(rowIndex);
return row[columnIndex];
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
Object[] row = rows.get(rowIndex);
row[columnIndex] = aValue;
int counter = 0;
for (int col = 3; col < 7; col++) {
Object value = row[col];
if (value instanceof Boolean && (boolean) value) {
counter++;
}
}
row[7] = counter;
fireTableCellUpdated(rowIndex, columnIndex);
fireTableCellUpdated(rowIndex, 7);
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex >= 3 && columnIndex <= 6;
}
}
}
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