我一直在学习java教程,我想知道是否有人可以帮助我实现一些东西。我想将数据动态实现到 Object[][] data = ...
但我不知道如何实现。我从 .xml 文件中提取信息,并将其存储在多个数组中,然后我想将其输入到 2D 数组中。
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
// Here is where I would like to pull my data and put it in.
// Assume the program does not know how many rows it needs
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public final Object[] longValues = {"Jane", "Kathy",
"None of the above",
new Integer(20), Boolean.TRUE};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
}
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
}
}
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
}
System.out.println();
}
System.out.println("--------------------------");
}
}
最佳答案
数组的长度是固定的。我假设您使用的是 JTable(Object[][] rowData, Object[] columnNames)
构造函数。请改用 JTable(Vector rowData, Vector columnNames)
构造函数。通过这种方式,您可以动态添加元素,如 doc.oracle.com's "How to Use Tables" tutorial 中所示。 .
public class JTableCreatingByVector {
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Vector<String> rowOne = new Vector<String>();
rowOne.addElement("Row1-Column1");
rowOne.addElement("Row1-Column2");
rowOne.addElement("Row1-Column3");
Vector<String> rowTwo = new Vector<String>();
rowTwo.addElement("Row2-Column1");
rowTwo.addElement("Row2-Column2");
rowTwo.addElement("Row2-Column3");
Vector<Vector> rowData = new Vector<Vector>();
rowData.addElement(rowOne);
rowData.addElement(rowTwo);
Vector<String> columnNames = new Vector<String>();
columnNames.addElement("Column One");
columnNames.addElement("Column Two");
columnNames.addElement("Column Three");
JTable table = new JTable(rowData, columnNames);
JScrollPane scrollPane = new JScrollPane(table);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}
关于java - 动态添加数据到MyTableModel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28487530/