Java 2 Standard Edition zamonaviy dasturlash tili

Chekbox elementi va u xosil qilgan xodisa asosida matn ko’rinishini qalinroq qilish

Bold va Italic yozuvlariga ega Checkbox elementlari tanlanganda matn qalin va kursiv yozuvga o’zgaradi:

Chekbox elementi va u xosil qilgan xodisa asosida matn ko'rinishini qalinroq va kursiv qilish

Checkbox elementi birdaniga bir nechta variantlarni tanlash imkonini berish uchun ishlatiladi. Bir nechta variantlardan faqat bittasini tanlash uchun Radio tugmalar ishlatiladi. Bir variant tanlanganda boshqa tanlangan variantlar belgilanishi bekor qilinadi. Buning uchun Radio tugmalar bir guruhda bo’lishi kerak. Radio tugmalar jRadioButton klassi yordamida yaratiladi. Radio tugmalar guruhi ButtonGroup klassi yordamida xosil qilinadi. Quyidagi oynada Radio tugmalar ko’rsatilgan:

import java.awt.*; import javax.swing.*; public class RadioTanlash {

public static void main(String[] args)

{

RadioTanlash rt = new RadioTanlash(); rt.go();

}

public void go()

{

JFrame frame = new JFrame("Radio Tanlash");

JPanel panel = new JPanel( );

ButtonGroup guruh = new ButtonGroup();

JRadioButton rb1 = new JRadioButton("Kichik"); guruh.add(rb1);

JRadioButton rb2 = new JRadioButton("Oddiy"); guruh.add(rb2);

JRadioButton rb3 = new JRadioButton("Katta"); guruh.add(rb3);

JLabel label = new JLabel("Iltimos, matn xususiyatini belgilang");

label.setFont(new Font("Arial", Font.PLAIN, 14));

panel.add(rb1);

panel.add(rb2) ;

panel.add(rb3) ;

panel.add(label);

frame.getContentPane().add(panel);

frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); frame.setSize(300,200); frame.setVisible(true);

}

}

Radio button element foydalanuvchi tomonidan tanlanganda ActionEvent xodisasi xosil qilinadi va ActionListener interfeysi yordamida ushbu xodisani qabul qilib biron bir amal bajarib olish mumkin. Masalan, quyidagi dastur tegishli Radio tugmasi tanlanganda oynadagi matn o’lchamini o’zgartirib beradi:

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class RadioTanlash {

JRadioButton rb1;

JRadioButton rb2;

JRadioButton rb3;

JLabel label;

public static void main(String[] args)

{

RadioTanlash rt = new RadioTanlash(); rt.go() ;

}

public void go()

{

JFrame frame = new JFrame("Radio Tanlash");

JPanel panel = new JPanel( );

ActionListener Listener = new Listener();

ButtonGroup guruh = new ButtonGroup(); rb1 = new JRadioButton("Kichik"); rb1.addActionListener(Listener); guruh.add(rb1);

rb2 = new JRadioButton("Oddiy"); rb2.addActionListener(Listener) ; guruh.add(rb2);

rb3 = new JRadioButton("Katta"); rb3.addActionListener(Listener) ; guruh.add(rb3);

label = new JLabel("Iltimos, matn xususiyatini belgilang");

panel.add(rb1); panel.add(rb2); panel.add(rb3); panel.add(label);

frame.getContentPane().add(panel);

frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); frame.setSize(300,200); frame.setVisible(true);

}

public class Listener implements ActionListener {

public void actionPerformed(ActionEvent e)

{

if(rb1.isSelected()) label.setFont(new Font("Arial", Font.PLAIN, 12)); if(rb2.isSelected()) label.setFont(new Font("Arial", Font.PLAIN, 14)); if(rb3.isSelected()) label.setFont(new Font("Arial", Font.PLAIN, 16));

}

}

}

Ushbu dastur quyidagi oynani ekrangachiqarib beradi:

Radio tugmalar va u xosil qilgan xodisa asosida amal bajarish

Kichik va Katta yozuvlariga ega Radio tugmalari tanlanganda matn o’lchami o’zgarishi quyidagi oynalarda ko’rsatilgan:

Radio tugma tanlanganda xosil qilingan xodisa asosida matn ko’rinishini o’zgartirish




Guruhda bo’lgan Radio tugmalarning bir vaqtning o’zida faqatgina bittasi tanlangan bo’lishi mumkin.