Java Jtable列中的ArrayList
我正在创建一个Jtable,只有一列(月列),并在button的帮助下在列中添加一个arraylist Arraylist包含月份名称,具体取决于选中的月份 我的问题是,当我添加数组列表时,上一行也会更改 我不知道发生了什么事 这是我解决这个问题的代码Java Jtable列中的ArrayList,java,swing,jtable,Java,Swing,Jtable,我正在创建一个Jtable,只有一列(月列),并在button的帮助下在列中添加一个arraylist Arraylist包含月份名称,具体取决于选中的月份 我的问题是,当我添加数组列表时,上一行也会更改 我不知道发生了什么事 这是我解决这个问题的代码 package test; import java.awt.BorderLayout; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt
package test;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class Jtable extends JFrame {
JTable table;
JButton button;
JPanel mp;
DefaultTableModel model;
JCheckBox chkJan;
JCheckBox chkFeb;
JCheckBox chkMarch;
JCheckBox chkApril;
JCheckBox chkMay;
JCheckBox chkJun;
JCheckBox chkJuly;
JCheckBox chkAug;
JCheckBox chkSep;
JCheckBox chkOct;
JCheckBox chkNov;
JCheckBox chkDec;
List<String> Months = null;
public Jtable() {
table = new JTable();
button = new JButton("Add to Table");
mp = new JPanel();
Months = new ArrayList<>();
chkJan = new JCheckBox("JAN");
chkFeb = new JCheckBox("FEB");
chkMarch = new JCheckBox("MARCH");
chkApril = new JCheckBox("APRIL");
chkMay = new JCheckBox("MAY");
chkJun = new JCheckBox("JUN");
chkJuly = new JCheckBox("JULY");
chkAug = new JCheckBox("AUG");
chkSep = new JCheckBox("SEP");
chkOct = new JCheckBox("OCT");
chkNov = new JCheckBox("NOV");
chkDec = new JCheckBox("DEC");
mp.setLayout(new FlowLayout(FlowLayout.LEFT));
mp.setSize(300, 200);
mp.add(chkJan);
mp.add(chkFeb);
mp.add(chkMarch);
mp.add(chkApril);
mp.add(chkMay);
mp.add(chkJun);
mp.add(chkJuly);
mp.add(chkAug);
mp.add(chkSep);
mp.add(chkOct);
mp.add(chkNov);
mp.add(chkDec);
model = new DefaultTableModel();
table.setModel(model);
model.addColumn("Months");
JScrollPane sp = new JScrollPane(table);
setLayout(new BorderLayout());
add(sp, BorderLayout.CENTER);
add(button, BorderLayout.SOUTH);
add(mp, BorderLayout.NORTH);
setSize(800, 600);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Month();
Object[] row = {Months};
model.addRow(row);
}
});
}
public void Month() {
Months.removeAll(Months);
if (chkJan.isSelected()) {
Months.add("January");
} else {
Months.remove("January");
}
if (chkFeb.isSelected()) {
Months.add("Febuary");
} else {
Months.remove("Febuary");
}
if (chkMarch.isSelected()) {
Months.add("March");
} else {
Months.remove("March");
}
if (chkApril.isSelected()) {
Months.add("April");
} else {
Months.remove("April");
}
if (chkMay.isSelected()) {
Months.add("May");
} else {
Months.remove("May");
}
if (chkJun.isSelected()) {
Months.add("Jun");
} else {
Months.remove("Jun");
}
if (chkJuly.isSelected()) {
Months.add("July");
} else {
Months.remove("July");
}
if (chkAug.isSelected()) {
Months.add("August");
} else {
Months.remove("August");
}
if (chkSep.isSelected()) {
Months.add("September");
} else {
Months.remove("September");
}
if (chkOct.isSelected()) {
Months.add("Octuber");
} else {
Months.remove("Octuber");
}
if (chkNov.isSelected()) {
Months.add("November");
} else {
Months.remove("November");
}
if (chkDec.isSelected()) {
Months.add("December");
} else {
Months.remove("December");
}
}
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Jtable.class
.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Jtable().setVisible(true);
}
});
}
}
封装测试;
导入java.awt.BorderLayout;
导入java.awt.FlowLayout;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.util.ArrayList;
导入java.util.List;
导入javax.swing.JButton;
导入javax.swing.JCheckBox;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.table.DefaultTableModel;
公共类Jtable扩展了JFrame{
JTable表;
按钮;
JPanel议员;
默认表格模型;
JCheckBox-chkJan;
JCheckBox-chkFeb;
JCheckBox-chkMarch;
JCheckBox-chkApril;
JCheckBox chkMay;
JCheckBox-chkJun;
JCheckBox chkJuly;
JCheckBox-chkAug;
JCheckBox-chkSep;
JCheckBox-chkOct;
JCheckBox-chkNov;
JCheckBox-chkDec;
列表月份=空;
公共Jtable(){
table=新的JTable();
按钮=新的JButton(“添加到表”);
mp=新的JPanel();
月份=新的ArrayList();
chkJan=新JCheckBox(“JAN”);
chkFeb=新的JCheckBox(“FEB”);
chkMarch=新JCheckBox(“三月”);
chkApril=新JCheckBox(“四月”);
chkMay=新JCheckBox(“五月”);
chkJun=新JCheckBox(“JUN”);
chkJuly=新JCheckBox(“七月”);
chkAug=新JCheckBox(“八月”);
chkSep=新的JCheckBox(“SEP”);
chkOct=新JCheckBox(“OCT”);
chkNov=新的JCheckBox(“NOV”);
chkDec=新JCheckBox(“DEC”);
mp.setLayout(新的FlowLayout(FlowLayout.LEFT));
mp.设置尺寸(300200);
议员增补(chkJan);
mp.add(chkFeb);
议员增补(chkMarch);
mp.add(chkApril);
议员增补(chkMay);
议员增补(chkJun);
议员增补(CHK7月);
议员增补(chkAug);
mp.add(chkSep);
议员增补(chkOct);
议员增补(chkNov);
mp.add(chkDec);
模型=新的DefaultTableModel();
表2.setModel(model);
模型。添加列(“月”);
JScrollPane sp=新的JScrollPane(表);
setLayout(新的BorderLayout());
添加(sp,BorderLayout.CENTER);
添加(按钮,BorderLayout.SOUTH);
添加(mp,BorderLayout.NORTH);
设置大小(800600);
addActionListener(新建ActionListener()){
@凌驾
已执行的公共无效操作(操作事件e){
月份();
对象[]行={Months};
model.addRow(row);
}
});
}
公众假期月{
月。移除所有(月);
如果(chkJan.isSelected()){
月份。添加(“一月”);
}否则{
月。移除(“一月”);
}
if(chkFeb.isSelected()){
月份。添加(“二月”);
}否则{
月。移除(“二月”);
}
if(chkMarch.isSelected()){
月份。添加(“三月”);
}否则{
月。移除(“三月”);
}
if(chkApril.isSelected()){
月份。添加(“四月”);
}否则{
月。移除(“四月”);
}
if(chkMay.isSelected()){
月份。添加(“五月”);
}否则{
月。移除(“五月”);
}
如果(chkJun.isSelected()){
月份。添加(“六月”);
}否则{
月。移除(“六月”);
}
如果(chkJuly.isSelected()){
月。添加(“7月”);
}否则{
月。移除(“七月”);
}
if(chkAug.isSelected()){
月份。添加(“八月”);
}否则{
月。移除(“八月”);
}
if(chkSep.isSelected()){
月。添加(“9月”);
}否则{
月。移除(“九月”);
}
if(chkOct.isSelected()){
月份。添加(“Octuber”);
}否则{
月。移除(“Octuber”);
}
if(chkNov.isSelected()){
月份。添加(“11月”);
}否则{
月。移除(“11月”);
}
if(chkDec.isSelected()){
月份。添加(“12月”);
}否则{
月。移除(“十二月”);
}
}
公共静态void main(字符串参数[]){
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus(在JavaSE6中引入)不可用,请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
for(javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels()){
if(“Nimbus”.equals(info.getName())){
setLookAndFeel(info.getClassName());
打破
}
}
}catch(ClassNotFoundException |实例化Exception | IllegalacessException | javax.swing.UnsupportedLookAndFeelException ex){
java.util.logging.Logger.getLogger(Jtable.class
.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
//
/*创建并显示表单*/
invokeLater(new Runnable()){
公开募捐{
新Jtable().setVisible(true);
}
});
}
}
您的问题是月份
是全局变量,您需要的是局部变量。如果在某个地方编辑此变量,则使用它的每个对象(如行或表)都将反映其更改
您可以将Months
移动到方法中只有本地访问权限的某个地方,例如
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
model.addRow(Months());
}
});
public Object[] Month() {
List<String> Months = new ArrayList<>();
if (chkJan.isSelected()) {
Months.add("January");
} else ...
...
return new Object[]{Months};
}
public void Month() {
Months.removeAll(Months);
...
public void Month() {
Months = new ArrayList<>();
...