Konstruktor JComboBox

// Program Java untuk membuat JComboBox sederhana

// dan menambahkan elemen ke dalamnya

impor  java .awt .event . * ;ΓÇïΓÇï

impor  java .awt . * ;ΓÇï

impor  javax .swing . * ;ΓÇï

kelas  memecahkan  memperluas  JFrame  mengimplementasikan  ItemListener {

Bahasa Indonesia:

    // bingkai

     JFrame  statis f ;

Bahasa Indonesia:

    // label

    statis  JLabel  l , l1 ;

Bahasa Indonesia:

    // kotak kombo

    statis  JComboBox  c1 ;

Bahasa Indonesia:

    // kelas utama

    publik  statis  void  utama ( String [] args)

    {

        // membuat bingkai baru

        f  =  JFrame baru  ( "bingkai" );

Bahasa Indonesia:

        // membuat objek

        selesaikan  s  =  selesaikan baru  ();

Bahasa Indonesia:

        // mengatur tata letak bingkai

        f.setLayout ( baru  FlowLayout () ) ;

Bahasa Indonesia:

        // array string yang berisi kota

        String  s1 [] = { "Jalpaiguri" , "Mumbai" , "Noida" , "Kolkata" , "New Delhi" };

Bahasa Indonesia:

        // buat kotak centang

        c1  =  JComboBox baru  ( s1 );

Bahasa Indonesia:

        // tambahkan ItemListener

        c1.tambahkanItemListener ( s ) ;ΓÇï

Bahasa Indonesia:

        // membuat label

        l  =  new  JLabel ( "pilih kota Anda" );

        l1  =  new  JLabel ( "Jalpaiguri dipilih" );

Bahasa Indonesia:

        // mengatur warna teks

        l . setForeground ( Warna . merah );

        l1.setForeground ( Warna.biru ) ;ΓÇïΓÇïΓÇï

Bahasa Indonesia:

        // buat panel baru

        JPanel  p  =  JPanel baru  ();

Bahasa Indonesia:

        p.tambahkan ( l ) ;ΓÇï

Bahasa Indonesia:

        // tambahkan kotak kombo ke panel

        p.add(c1);

ΓÇï

        p.add(l1);

ΓÇï

        // add panel to frame

        f.add(p);

ΓÇï

        // set the size of frame

        f.setSize(400, 300);

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        f.show();

    }

    public void itemStateChanged(ItemEvent e)

    {

        // if the state combobox is changed

        if (e.getSource() == c1) {

ΓÇï

            l1.setText(c1.getSelectedItem() + " selected");

        }

    }

}

// Java Program to create two  checkbox 

// one editable and other read only

import java.awt.event.*;

import java.awt.*;

import javax.swing.*;

class solve extends JFrame implements ItemListener {

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    // frame

    static JFrame f;

ΓÇï

    // label

    static JLabel l, l1, l3, l4;

ΓÇï

    // combobox

    static JComboBox c1, c2;

ΓÇï

    // main class

    public static void main(String[] args)

    {

        // create a new frame

        f = new JFrame("frame");

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        // create a object

        solve s = new solve();

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        // array of string containing cities

        String s1[] = { "Jalpaiguri", "Mumbai", "Noida", "Kolkata", "New Delhi" };

        String s2[] = { "male", "female", "others" };

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        // create checkbox

        c1 = new JComboBox(s1);

        c2 = new JComboBox(s2);

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        // set Kolkata and male as selected items

        // using setSelectedIndex

        c1.setSelectedIndex(3);

        c2.setSelectedIndex(0);

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        // add ItemListener

        c1.addItemListener(s);

        c2.addItemListener(s);

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        // set the checkbox as editable

        c1.setEditable(true);

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        // create labels

        l = new JLabel("select your city ");

        l1 = new JLabel("Jalpaiguri selected");

        l3 = new JLabel("select your gender ");

        l4 = new JLabel("Male selected");

ΓÇï

        // set color of text

        l.setForeground(Color.red);

        l1.setForeground(Color.blue);

        l3.setForeground(Color.red);

        l4.setForeground(Color.blue);

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        // create a new panel

        JPanel p = new JPanel();

ΓÇï

        p.add(l);

ΓÇï

        // add combobox to panel

        p.add(c1);

ΓÇï

        p.add(l1);

ΓÇï

        p.add(l3);

ΓÇï

        // add combobox to panel

        p.add(c2);

ΓÇï

        p.add(l4);

ΓÇï

        // set a layout for panel

        p.setLayout(new FlowLayout());

ΓÇï

        // add panel to frame

        f.add(p);

ΓÇï

        // set the size of frame

        f.setSize(400, 400);

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        f.show();

    }

    public void itemStateChanged(ItemEvent e)

    {

        // if the state combobox 1is changed

        if (e.getSource() == c1) {

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            l1.setText(c1.getSelectedItem() + " selected");

        }

ΓÇï

        // if state of combobox 2 is changed

        else

            l4.setText(c2.getSelectedItem() + " selected");

    }

}

// Java  Program to create a checkbox 

// and add or remove items from it

import java.awt.event.*;

import java.awt.*;

import javax.swing.*;

class solve11 extends JFrame implements ItemListener, ActionListener {

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    // frame

    static JFrame f;

ΓÇï

    // label

    static JLabel l, l1;

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    // combobox

    static JComboBox c1;

ΓÇï

    // textfield to add and delete items

    static JTextField tf;

ΓÇï

    // main class

    public static void main(String[] args)

    {

        // create a new frame

        f = new JFrame("frame");

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        // create a object

        solve11 s = new solve11();

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        // set layout of frame

        f.setLayout(new FlowLayout());

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        // array of string containing cities

        String s1[] = { "Jalpaiguri", "Mumbai", "Noida", "Kolkata", "New Delhi" };

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        // create checkbox

        c1 = new JComboBox(s1);

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        // create textfield

        tf = new JTextField(16);

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        // create add and remove buttons

        JButton b = new JButton("ADD");

        JButton b1 = new JButton("REMOVE");

ΓÇï

        // add action listener

        b.addActionListener(s);

        b1.addActionListener(s);

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        // add ItemListener

        c1.addItemListener(s);

ΓÇï

        // create labels

        l = new JLabel("select your city ");

        l1 = new JLabel("Jalpaiguri selected");

ΓÇï

        // set color of text

        l.setForeground(Color.red);

        l1.setForeground(Color.blue);

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        // create a new panel

        JPanel p = new JPanel();

ΓÇï

        p.add(l);

ΓÇï

        // add combobox to panel

        p.add(c1);

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        p.add(l1);

        p.add(tf);

        p.add(b);

        p.add(b1);

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        f.setLayout(new FlowLayout());

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        // add panel to frame

        f.add(p);

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        // set the size of frame

        f.setSize(700, 200);

ΓÇï

        f.show();

    }

    // if button is pressed

    public void actionPerformed(ActionEvent e)

    {

        String s = e.getActionCommand();

        if (s.equals("ADD")) {

            c1.addItem(tf.getText());

        }

        else {

            c1.removeItem(tf.getText());

        }

    }

ΓÇï

    public void itemStateChanged(ItemEvent e)

    {

        // if the state combobox is changed

        if (e.getSource() == c1) {

ΓÇï

            l1.setText(c1.getSelectedItem() + " selected");

        }

    }

}