[英]Referencing an object from another class
我一直在擺弄TabbedPanes,並且希望能夠使用另一個類中的方法來設置選擇哪個標簽。
但是,嘗試執行此操作時,出現兩個錯誤。
首先,它告訴我第二類中提供的方法的參數“名稱”具有“組件中的私有訪問權限”
error: name has private access in Component
TabbedPanes.name.setSelectedIndex(0);
其次,它告訴我無法從第二個類的自定義方法中找到我要調用的方法的符號。
error: cannot find symbol
TabbedPanes.name.setSelectedIndex(0);
^
symbol: method setSelectedIndex(int)
location: variable name of type String
我的第一堂課TabbedPanes可以在下面找到:
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.BoxLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
public class TabbedPanes extends JFrame implements ActionListener
{
JTabbedPane tabs;
JPanel pan1, pan2, pan3, pan4, pan5, pan6, pan7, pan8;
JFrame frame;
JScrollPane scroll1, scroll2, scroll3, scroll4, scroll5, scroll6, scroll7, scroll8;
public void Tabs()
{
tabs = new JTabbedPane();
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pan1 = new JPanel(new FlowLayout(FlowLayout.LEFT));
JScrollPane scroll1 = new JScrollPane(pan1);
scroll1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
pan2 = new JPanel();
pan3 = new JPanel();
pan4 = new JPanel();
pan5 = new JPanel();
pan6 = new JPanel();
pan7 = new JPanel();
pan8 = new JPanel();
JScrollPane scroll8 = new JScrollPane(pan8);
scroll8.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll8.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
Container pane = frame.getContentPane();
pane.add(tabs);
tabs.add("Mon", scroll1);
tabs.add("Tue", pan2);
tabs.add("Wed", pan3);
tabs.add("Thu", pan4);
tabs.add("Fri", pan5);
tabs.add("Sat", pan6);
tabs.add("Sun", pan7);
tabs.add("Notes", scroll8);
Dates datesObject = new Dates();
datesObject.tabOnStartup("tabs");
frame.setSize(400,400);
frame.setVisible(true);
}
public static void main(String[] args)
{
TabbedPanes TrueTabs = new TabbedPanes();
TrueTabs.Tabs();
}
}
第二類,日期,可以在下面找到:
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.BoxLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
public class Dates
{
public void tabOnStartup(String name)
{
TabbedPanes.name.setSelectedIndex(0);
}
任何幫助將不勝感激,我希望我的代碼足夠干凈可以閱讀。
如果我有你的權利,你必須改變類TabbedPanes變量JTabbedPane的選項卡,靜態: static JTabbedPane tabs;
此外,在課堂上您必須使用日期
TabbedPanes.tabs.setSelectedIndex(0);
代替
TabbedPanes.name.setSelectedIndex(0);
看來您尚未在TabbedPanes類中實現方法:
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
如果您正在使用IDE(例如Eclipse,NetBeans等),則應該收到一條錯誤消息,例如
- The type TabbedPanes must implement the inherited abstract method
ActionListener.actionPerformed(ActionEvent)
經過這些修正后,結果是:
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