Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListSelectionModel;

public class Main {

    public static void main(String args[]) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JList list = new JList(new CheckListItem[] { new CheckListItem("apple"), new CheckListItem("orange"),
                new CheckListItem("mango"), new CheckListItem("mango"), new CheckListItem("mango"),
                new CheckListItem("mango"), new CheckListItem("mango"), new CheckListItem("mango"),
                new CheckListItem("mango"), new CheckListItem("mango"), new CheckListItem("mango"),

                new CheckListItem("paw paw"), new CheckListItem("banana") });
        list.setCellRenderer(new CheckListRenderer());
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        list.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent event) {
                JList list = (JList) event.getSource();
                int index = list.locationToIndex(event.getPoint());// Get index of item
                                                                   // clicked
                CheckListItem item = (CheckListItem) list.getModel().getElementAt(index);
                item.setSelected(!item.isSelected()); // Toggle selected state
                list.repaint(list.getCellBounds(index, index));// Repaint cell
            }
        });
        frame.getContentPane().add(new JScrollPane(list));
        frame.pack();
        frame.setVisible(true);
    }
}

class CheckListItem {

    private String label;
    private boolean isSelected = false;

    public CheckListItem(String label) {
        this.label = label;
    }

    public boolean isSelected() {
        return isSelected;
    }

    public void setSelected(boolean isSelected) {
        this.isSelected = isSelected;
    }

    @Override
    public String toString() {
        return label;
    }
}

class CheckListRenderer extends JCheckBox implements ListCellRenderer {
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
            boolean hasFocus) {
        setEnabled(list.isEnabled());
        setSelected(((CheckListItem) value).isSelected());
        setFont(list.getFont());
        setBackground(list.getBackground());
        setForeground(list.getForeground());
        setText(value.toString());
        return this;
    }
}