Awt Example Text Area

//MyAwt.java

import java.awt.*;
import java.awt.event.*;


public class MyAwt extends Frame implements ActionListener{
 
    Button btnSave = new Button();
    Button btnClear = new Button();
    TextField txt1 = new TextField();
    TextField txt2 = new TextField();

    TextArea txtar= new TextArea();

    Label lbl1 = new Label();
    Label lbl2 = new Label();
 
 
    public MyAwt()
    {
        this.setLayout(null);
        this.add(lbl1,null);
        lbl1.setText("Name");
        lbl1.setBounds(20,70 , 50, 20);

        this.add(lbl2,null);
        lbl2.setText("Number");
        lbl2.setBounds(20,110 , 50, 20);

        this.add(txt1,null);
        txt1.setBounds(80,70 , 200, 20);

        this.add(txt2,null);
        txt2.setBounds(80,110 , 200, 20);

        this.add(btnSave,null);
        btnSave.setLabel("SUBMIT");
        btnSave.setBounds(70,150 , 60, 30);
        btnSave.addActionListener(this);

        this.add(btnClear,null);
        btnClear.setLabel("CLEAR");
        btnClear.setBounds(140,150 , 60, 30);
        btnClear.addActionListener(this);

        this.add(txtar,null);
        txtar.setBounds(20,190 , 360, 100);
        txtar.setEnabled(false);
    }
 
 
    public void actionPerformed(ActionEvent e)
    {
        Object o = e.getSource();
        if(o.equals(btnSave))
        {
            txtar.setEnabled(true);
            txtar.setText("Name : "+txt1.getText()+"\nNumber : "+txt2.getText());
            txtar.setEditable(false);
        }
        if(o.equals(btnClear))
        {
            txt1.setText("");
            txt2.setText("");
            txtar.setText("");
            txtar.setEnabled(false);
        }
    }
 

    //main
    public static void main(String[] args) {
        MyAwt t = new MyAwt();
        t.setSize(400,320);
        TWindow tw = new TWindow();
        t.addWindowListener(tw);
        t.setTitle("My AWT");
        t.setVisible(true);
    }
}

//TWindow.java

import java.awt.*;

import java.awt.event.*;

public class TWindow extends WindowAdapter{

      public void windowClosing(WindowEvent e) 

    { 

        System.exit(0); 

    } 

}

awt lower to upper

//Import Statements

import java.awt.*;

import java.awt.event.*;

//Class method

class ChangeCase extends Frame implements ActionListener

{

    //Variable declaration

    Checkbox ch1,ch2,ch3,ch4,ch5;

    CheckboxGroup chg;

    Button bu;

    TextArea tax;

    public ChangeCase(String title)//Main method

    {

    super(title);

    chg=new CheckboxGroup();//Object creation

    ch1=new Checkbox("SentenceCase",chg,false);

    ch2=new Checkbox("lowercase",chg,false);

    ch3=new Checkbox("UPPERCASE",chg,false);

    ch4=new Checkbox("TitleCase",chg,false);

    ch5=new Checkbox("tOGGLEcASE",chg,false);

    bu=new Button("Apply");

    tax=new TextArea();

    setLayout(new GridLayout(7,1));

    add(ch1);

    add(ch2);

    add(ch3);

    add(ch4);

    add(ch5);

    add(bu);

    add(tax);

    bu.addActionListener(this);

//  addWindowListener(new Mywindow());

    setSize(400,400);

    setVisible(true);

    }

    // © http://students3k.com – Karhtikh venkat

    public void actionPerformed(ActionEvent e)

    {

 

        if(e.getSource()==bu)//Decision making statement

        {

                int i;

                StringBuffer str=new StringBuffer(ta.getText());

                String s;

                if(ch1.getState()==true)

                {

                str.insert(0,Character.toUpperCase(str.charAt(0)));

                str.deleteCharAt(1);

                for(i=0;i<str.length();i++)//For statement

                    {

                    if(str.charAt(i)=='.')

                    {

                    str.insert(i+2,Character.toUpperCase(str.charAt(i+2)));

                    str.deleteCharAt(i+3);

                    }

                }

                tax.setText(new String(str));

                }

                else if(ch2.getState()==true)

                {

                s=tax.getText();

                s=s.toLowerCase();

                tax.setText(s);

                }

                else if(ch3.getState()==true)

                {

                s=tax.getText();

                s=s.toUpperCase();

                tax.setText(s);

                }

                else if(ch4.getState()==true)

                {

                s=tax.getText();

                s=s.toLowerCase();

                str=new StringBuffer(s);

        // © http://students3k.com – Karhtikh venkat

    str.insert(0,Character.toUpperCase(str.charAt(0)));

                str.deleteCharAt(1);

                for(i=0;i<str.length();i++)

                {

                if(Character.isSpace(str.charAt(i))==true)

                    {

                    str.insert(i+1,Character.toUpperCase(str.charAt(i+1)));

                    str.deleteCharAt(i+2);

                    }

                }

                tax.setText(new String(str));

                }

                else

                {

                s=tax.getText();

                s=s.toUpperCase();

                str=new StringBuffer(s);

                str.insert(0,Character.toLowerCase(str.charAt(0)));

                str.deleteCharAt(1);

                for(i=0;i<str.length();i++)

                {

                if(Character.isSpace(str.charAt(i))==true)

                    {

                    str.insert(i+1,Character.toLowerCase(str.charAt(i+1)));

                    str.deleteCharAt(i+2);

                    }

                }

                tax.setText(new String(str));

                }

 

        }

        // © http://students3k.com – Karhtikh venkat

    }

    public static void main(String a[])

    {

    ChangeCase n=new ChangeCase("ChangeCase");

    }

}