AWT-Abstract Window Toolkit

Class List

• The List represents a list of text items.
• The list can be set up so that the user can choose either one item or multiple items.

• List()
• Creates a new scrolling list.
For ex: lst=new List();
• List( int rows )
• Creates a new scrolling list initialized with the specified number of visible lines.
For ex: lst=new List(5);
• List( int rows , boolean multipleMode )
• Creates a new scrolling list initialized to display the specified number of rows.
For ex: lst=new List(5,true);

• void add(String item)
• Adds the specified item at end.
For ex:lst.add("Mumbai");
• void add(String item,int index)
• Adds the specified item at end.
For ex: lst.add("Nagpur",1);
• String getItem(int index)
• Gets the item associated with the specified index.
For ex:String data=lst.getItem(2);
• String[] getItems()
• Gets the items in the list.
For ex:String arr[]=lst.getItems();
• int getItemCount()
• Gets the number of items in the list.
For ex:int n=lst.getItemCount();
• int getSelectedIndex()
• Gets the index of the first selected item on the list.
• Returns -1 if no item is selected.
For ex: int n=lst.getSelectedIndex();
• int[ ] getSelectedIndexes()
• Gets the selected indexes on the list.
For ex:int arr[ ]=lst.getSelectedIndexes();
• String getSelectedItem()
• Gets the first selected item.
• Returns null if no item is selected.
For ex:String data=lst.getSelectedItem();
• String[] getSelectedItems()
• Gets all selected items.
For ex:String arr[]=lst.getSelectedItems();
• void select(int index)
• Selects the item at the specified index.
For ex:lst.select(2);
• boolean isIndexSelected(int index)
• Determines if the specified item is selected or not.
For ex:boolean res=lst.isIndexSelected(2);
• void remove(int position)
• Removes the item at the specified position.
For ex: lst.remove(2);
• void remove(String item)
• Removes the first occurrence of an item from the list.
For ex:lst.remove("Pune");
• void replaceItem( String newValue, int index )
• Replaces the item at the specified index
For ex:lst.replaceItem("Nasik",2);
• void removeAll()
• Removes all items from this list.
For ex:lst.removeAll();
• void addItemListener(ItemListener l)
• Registers an item listener with the list.
• Due to which notification will be send to listener x when item is selected.
For ex:lst.select(2);

 import java.applet.Applet;
 import java.awt.*;
 import java.awt.event.*;
 class MyFrame extends Frame implements ActionListener
 {
    List lst;
    TextField txt;
    Button b1,b2;
    public MyFrame()
    {
        setLayout(new GridLayout(1,2,10,10));
        lst=new List(10);
        add(lst);
        lst.add("Amravati");
        lst.add("Pune");
        lst.add("Nagpur");
        Panel pnl=new Panel(new GridLayout(3,1,10,10));
        add(pnl);
        txt=new TextField(10);
        pnl.add(txt);
        b1=new Button("Add");
        pnl.add(b1);
        b2=new Button("Delete");
        pnl.add(b2);
        b1.addActionListener(this);
        b2.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==b1)
        {
            String data=txt.getText();
            lst.add(data);
            txt.setText("");
        }
        if(e.getSource()==b2)
        {
            String data=lst.getSelectedItem();
            lst.remove(data);
        }
    }
 }
 class demo
 {
    public static void main(String args[])
    {
        MyFrame frm=new MyFrame();
        frm.setVisible(true);
        frm.setSize(400,300);
    }
 }