How can I set my database instance to start in OPEN mode after my computer

Hi all,
Sometime, I have to reboot my computer. After it rebooted, my instance is automaticaly executed. But, my database is not set to the OPEN mode (automaticaly). On some development computers, my status is set to OPEN after a reboot. On some computers, the local database is set to the IDLE instance.
How can I set my database instance to start in OPEN mode after my computer has rebooted?
Thank your for any help.

but i could not run command emctl start dbconsolor lsnrctl..
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i set oracle_home and oracle_sid in thereWhere? Is it set in your user variable part of system variable. It is good to set it in the system variable, so that it will be common for all the users who use the system.
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lol
import javax.swing.*;
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import java.util.*;
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As you can see I have tried this, but no success.
If I am doing something wrong please accept my apology, and address me in the right direction.
Thanks
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import javax.swing.*;
import javax.swing.table.TableModel;
import java.io.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class si1 extends javax.swing.JFrame implements ActionListener {
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        super("DataBase Loader");
        setSize(1025,740);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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        JPanel pane2 = new JPanel();
        JPanel pane3 = new JPanel();
        JPanel pane4 = new JPanel();
        pane.setLayout(new GridLayout(20,1));
        pane1.setLayout(new BorderLayout());
        int j=10;
        String[][] data = new String[j][2];
        for (int k=0; k<j; k++){
           String[] row = {"",""};
           data[k] = row;
        String[] columnNames = {"First Name", "Last Name"};
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        pane.add(pane2);
        pane.add(pane3);
        pane1.add(pane, BorderLayout.WEST);
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        pane1.add(pane4, BorderLayout.CENTER);
        setContentPane(pane1);
        show();
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        si1 frame = new si1();
        frame.setVisible(true);
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