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我是一個java程序員。autorefreshing jtable提取收集數據
我想讓一個讀取集合集合hashSet的JTable，並刷新每一次集合更改，也想每隔3秒重新刷新JPanel表中將在哪裏（這在原始程序中工作）重新刷新autorefresh。 也類班席改變布爾花費時間，我想改變它的JTable中的扭動Mats.name的顏色取決於Mats.take集合中的值，這是自動刷新的原因。
這是一個示例表，其每次添加新行時從scrach重新映射表中拋出java.lang.NullPointerException。 我簡直不明白爲什麼？ THX的幫助提前
public class Table extends JFrame {
private static JTable table;
private static JButton addbuttin;
private static TableModel model;
private static Set<Mats> set = null;
public static String colorString(String str, Mats a) {
if (a.getTake().equals(new Boolean(true))) {
return "<html><body><font color=red>" + str
+ "</font></body></html>";
} else {
return "<html><body><font color=blue>" + str
+ "</font></body></html>";
}
}
public static void main(String[] argv) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addbuttin = new JButton("Dodaj");
Mats a = new Mats(10, 10, 5, "WOOD", true);
Mats b = new Mats(10, 12, 5, "WOOD", false);
set = new HashSet<Mats>();
set.add(a);
set.add(b);
addbuttin.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
Mats c = new Mats(10, 12, 6, "WOOD", true);
set.add(c);
}
});
JPanel p = new JPanel();
model = new DefaultTableModel() {
public boolean isCellEditable(int rowIndex, int vColIndex) {
return false;
}
};
/**here is java.lang.NullPointerException*/
table.getModel().addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
if (e.equals(TableModelEvent.INSERT)) {
model = new DefaultTableModel();
addColumns();
adddata(set);
}
}
});
addColumns();
adddata(set);
table = new JTable(model);
JScrollPane scrollPane = new JScrollPane(table,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
p.add(scrollPane, BorderLayout.CENTER);
p.add(addbuttin, BorderLayout.EAST);
p.setSize(500, 400);
frame.add(p);
frame.setSize(600, 600);
frame.setVisible(true);
}
private static void addColumns() {
((DefaultTableModel) model).addColumn("NAME");
}
private static void adddata(Set<Mats> set) {
for (Iterator iterator = set.iterator(); iterator.hasNext();) {
Mats mats = (Mats) iterator.next();
String n = colorString(mats.getName(), mats);
((DefaultTableModel) model).insertRow(model.getRowCount(), new Object[] { n });
}
}
}
這是類地墊簡化
public class Mats implements Comparable<Mats> {
private String name;
private Boolean take;
/**
*
*/
public Mats() {
}
/**
*
* @param name
* @param uzet
*/
public Mats(String name, boolean take) {
this.name = name.toUpperCase();
this.take = take;
taken();
}
/**
*
* @param Material
*/
public Mats(Mats Material) {
this.name = Material.getName().toUpperCase();
this.take = Material.getTake();
Material.taken();
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name
* the name to set
*/
public void setName(String name) {
this.name = name.toUpperCase();
}
/**
* @param take
* the take to set
*/
public void setTake(Boolean take) {
this.take = take;
}
/**
* @return the take
*/
public Boolean getTake() {
return take;
}
/**
*
* @return
*/
@Override
public String toString() {
return "Material: ".toUpperCase() + getName() + "\n";
}
/**
*
* @param obj
* @return
*/
@Override
public boolean equals(Object obj) {
Mats a = (Mats) obj;
if (obj == null) {
return false;
}
if (a.getName() == this.getName()) {
return true;
}
return false;
}
/**
*
* @return
*/
@Override
public int hashCode() {
int hash = 3;
hash = 83 * hash + this.getX();
hash = 83 * hash + this.getY();
hash = 83 * hash
+ (this.getName() != null ? this.getName().hashCode() : 0);
return hash;
}
/**
*
*/
public void taken() {
MatRespawn s = new MatRespawn(1000, take);
s.start();
}
@Override
public int compareTo(Mats o) {
Integer a = this.getName();
if (a.compareTo(o.getName()) != 0)
return a.compareTo(o.getName());
return 0;
}
}
類MatRespawn從而改變Mats.take
public class MatRespawn extends Thread {
private int time;
private Boolean taken;
public MatRespawn(int time, Boolean take) {
this.time = time;
this.taken = take;
}
public int getTime() {
return time;
}
public void setTime(int time) {
this.time = time;
}
public Boolean getTaken() {
return taken;
}
public void setTaken(Boolean taken) {
this.taken = taken;
}
@Override
public void run() {
try {
while (true) {
if (taken.equals(new Boolean(true))) {
sleep(time * 10);
//JOptionPane.showMessageDialog(null, "dostupnost: " + taken);
taken = false;
}
sleep(time);
//JOptionPane.showMessageDialog(null, "dostupnost: " + taken);
taken = true;
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
需要在標題中全部大寫？你發佈的所有代碼？由於這些項目，我跳過了這個問題。 – jzd 2011-05-20 14:05:35
擺脫所有的靜態方法。這不是設計你的班級的方式。 – camickr 2011-05-20 14:56:58
我是一個java程序員，所以我不確定問題到底是什麼。 – nkvnkv 2011-05-20 19:08:20