英文:
JTable how can i show numbers as (#.00) format in double column class?
问题
我的 JTable 模型
DefaultTableModel modelim = new DefaultTableModel() {
public Class getColumnClass(int column) {
switch (column) {
case 0:
return Integer.class;
case 1:
case 2:
case 3:
return String.class;
case 4:
return Date.class;
case 5:
return Double.class;
default:
return String.class;
}
}
};
我有一个 JTable。第 5 列是用于双精度数的。例如，
1234.25
177.12
1745.02
1748.10
1899.00
这是第 5 列的项目。但当我启动程序时，它们看起来像这样，
1234.25
177.12
1745.02
1748.1 //不同
1899.0 //不同
所以它至少显示小数点后的一个数字。但我想看到小数点后有 2 个数字，
1748.10
1899.00
像这样。如果你们需要，我可以分享更多代码。
英文:
My JTable model
DefaultTableModel modelim = new DefaultTableModel() {
public Class getColumnClass(int column) {
switch (column) {
case 0:
return Integer.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return String.class;
case 4:
return Date.class;
case 5:
return Double.class;
default:
return String.class;
}
}
};
I have a JTable. Column 5 is for double numbers. For example.
1234.25
177.12
1745.02
1748.10
1899.00
This is the items of column 5. But when i start the program they look like this.
1234.25
177.12
1745.02
1748.1 //different
1899.0 //different
So it shows atleast 1 number after the dot. But i want to see the number with 2 nubmers after the dot.
1748.10
1899.00
As this. I can share more code if you guys need.
答案1
得分: 2
使用自定义单元格渲染器。请参阅如何使用表格和使用自定义渲染器。
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.text.NumberFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTable table = new JTable();
DefaultTableModel modelim = new DefaultTableModel() {
public Class getColumnClass(int column) {
switch (column) {
case 0:
return Integer.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return String.class;
case 4:
return Date.class;
case 5:
return Double.class;
default:
return String.class;
}
}
@Override
public int getColumnCount() {
return 6;
}
};
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 1.234567});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 2.345678});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 3.456789});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 4.567890});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 5.678901});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 6.789012});
table.setAutoCreateRowSorter(true);
table.setModel(modelim);
table.getColumnModel().getColumn(5).setCellRenderer(new DoubleFormatTableCellRenderer());
add(new JScrollPane(table));
}
}
public class DoubleFormatTableCellRenderer extends DefaultTableCellRenderer {
private NumberFormat numberFormat;
public NumberFormat getNumberFormat() {
if (numberFormat == null) {
numberFormat = NumberFormat.getNumberInstance();
numberFormat.setMinimumFractionDigits(2);
numberFormat.setMaximumFractionDigits(2);
}
return numberFormat;
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Double) {
value = getNumberFormat().format(value);
}
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
}
}
}
英文:
Use a custom cell renderer. See How to Use Tables and Using Custom Renderers
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.text.NumberFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTable table = new JTable();
DefaultTableModel modelim = new DefaultTableModel() {
public Class getColumnClass(int column) {
switch (column) {
case 0:
return Integer.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return String.class;
case 4:
return Date.class;
case 5:
return Double.class;
default:
return String.class;
}
}
@Override
public int getColumnCount() {
return 6;
}
};
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 1.234567});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 2.345678});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 3.456789});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 4.567890});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 5.678901});
modelim.addRow(new Object[] {1, "1", "1", "1", new Date(), 6.789012});
table.setAutoCreateRowSorter(true);
table.setModel(modelim);
table.getColumnModel().getColumn(5).setCellRenderer(new DoubleFormatTableCellRenderer());
add(new JScrollPane(table));
}
}
public class DoubleFormatTableCellRenderer extends DefaultTableCellRenderer {
private NumberFormat numberFormat;
public NumberFormat getNumberFormat() {
if (numberFormat == null) {
numberFormat = NumberFormat.getNumberInstance();
numberFormat.setMinimumFractionDigits(2);
numberFormat.setMaximumFractionDigits(2);
}
return numberFormat;
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if (value instanceof Double) {
value = getNumberFormat().format(value);
}
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
}
}
}
> i do use one. It was ok but when i try to sort the numbers i does not sort right. So i hade to use Double column class to make them sort right. But after i use Double column class the numbers became as this
Next time, provide a minimal reproducible example - it will prevent use from running over ground you might have already gone and/or see why your solution didn't work
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