Notes

(program-1):


import java.io.*;
import java.util.Scanner;
public class Lab1
{
public static void main(String args[])
{
String str,substr;
int idx1,idx2;
Scanner in=new Scanner(System.in);
System.out.println("Enter the String:");
str=in.next();
System.out.println("Enter the index1:");
idx1=in.nextInt();
System.out.println("Enter the index2:");
idx2=in.nextInt();
substr=str.substring(idx1,idx2);
System.out.println("The Substring is:"+substr);
}
}

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(program-2):(d)

import java.util.*;
class Student
{
String name;
int rollno;
float mark1,mark2;
void getdata()
{
Scanner in=new Scanner(System.in);
System.out.println("Enter the Name:");
name=in.next();
System.out.println("Enter the Rollno:");
rollno=in.nextInt();
System.out.println("Enter the Mark1:");
mark1=in.nextFloat();
System.out.println("Enter the Mark2:");
mark2=in.nextFloat();
}
void display()
{
System.out.println("Name of Student:"+name);
System.out.println("Rollno of Student:"+rollno);
System.out.println("Marks of Subject1:"+mark1);
System.out.println("Marks of Subject2:"+mark2);
}
}
interface Exam
{
void percentage();
}

class Result extends Student implements Exam
{
float tot;
public void percentage()
{
tot=mark1+mark2;
float percent=(tot/200)*100;
System.out.println("Total:"+tot);
System.out.println("Percentage:"+percent+"%");

}
}
class Lab2
{
public static void main(String args[])
{
Result R=new Result();
R.getdata();
R.display();
R.percentage();
}
}

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(program-3):

import java.io.*;
import java.util.Scanner;
class P3
{
public static void main(String args[])
{
int payamt;
Scanner in =new Scanner(System.in);
System.out.println("nn pay out of bound exception");
System.out.println("*******");
System.out.println("n Enter a basic pay amount");
payamt=in.nextInt();
try
{
if(payamt>1000)
throw new payoutofBoundException("Basic pay is out of bound");
else
System.out.println("n given basic pay is:"+payamt);
}
catch(Exception e)
{
System.out.println("caught:"+e);
}
}
}
class payoutofBoundException extends IOException
{
payoutofBoundException(String message)
{
System.out.println(message);
}
}


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(program-4):

import java.io.*;
class Table5 extends Thread
{
public void run()
{
for(int i=1;i<=5;i++)
{
System.out.println(i+"*5="+(i*5));
if(i==3)stop();
}
System.out.println("EXIT FIVE");
}
}
class Table7 extends Thread
{
public void run()
{
for(int j=1;j<=5;j++)
{
System.out.println(j+"*7="+(j*7));
try
{
sleep(1000);
}
catch(Exception e){}
}
System.out.println("EXIT SEVEN");
}
}
class Table13 extends Thread
{
public void run()
{
for(int k=1;k<=5;k++)
{
System.out.println(k+"*13="+(k*13));
}
System.out.println("EXIT THIRTEEN");
}
}
class lab4
{
public static void main(String args[])
{
Table5 t5=new Table5();
Table7 t7=new Table7();
Table13 t13=new Table13();
t5.setPriority(1);
t7.setPriority(5);
t13.setPriority(10);
System.out.println("MULTI THREADED USING PRIORITY");
t5.start();
t7.start();
t13.start();
}
}

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(program-5):

import java.awt.*;
import java.applet.*;
/*
<applet code="shapes" width=400 height=400>
</applet>
*/
public class shapes extends Applet
{
public void paint(Graphics g)
{
g.drawLine(10,10,50,50);
g.drawRect(10,60,40,30);
g.fillRect(60,10,30,80);
g.drawRoundRect(10,100,80,50,10,10);
g.fillRoundRect(20,110,60,30,5,5);
g.setColor(Color.green);
g.drawOval(100,10,200,150);
g.setColor(Color.red);
g.fillOval(115,25,100,100);
g.drawString("Shapes Demo",120,200);
}
}

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(program-6):

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Lab06 extends Frame implements ActionListener
{
TextField tname,tstreet,tcity,tpin;
Label lname,lstreet,lcity,lpin;
Button b1;
public Lab06()
{
setBackground(Color.gray);
setForeground(Color.red);
FlowLayout f=new FlowLayout();
setLayout(f);
lname=new Label("NAME");
lstreet=new Label("STREET");
lcity=new Label("CITY");
lpin=new Label("PINCODE");
tname=new TextField(35);
tstreet=new TextField(35);
tcity=new TextField(35);
tpin=new TextField(35);
b1=new Button("click me");
add(lname);
add(tname);
add(lstreet);
add(tstreet);
add(lcity);
add(tcity);
add(lpin);
add(tpin);

add(b1);
b1.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
{
tname.setText("SURYA");
tstreet.setText("22,RAMNAGAR");
tcity.setText("COIMBATORE");
tpin.setText("641009");
}
}
public boolean handleEvent(Event e)
{
if(e.id==Event.WINDOW_DESTROY)
System.exit(0);
return(super.handleEvent(e));
}
public static void main(String args[])
{
Lab06 a=new Lab06();
a.resize(380,300);
a.show();
}
}

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7))

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class Prac7 extends Applet implements
ActionListener
{
List list1;
TextField Text1;
Button butt;
public void init()
{
Text1=new TextField(40);
add(Text1);
list1=new List(0,true);
list1.add("C");
list1.add("COBOL");
list1.add("C++");
list1.add("JAVA");
list1.add("Oracle");
list1.add("Visual Basic");
list1.add("Visual C++");
list1.add("Adobe");
add(list1);
butt=new Button("Show Selection");
butt.addActionListener(this);
add(butt);
}
String Selections[];
public void actionPerformed(ActionEvent e)
{
String outstring=new String("youselected");
if(e.getSource()==butt)
{
Text1.setText("");
Selections=list1.getSelectedItems();
for(int loopIndex=0;loopIndex<Selections.length;loopIndex++)
{
outstring+=""+Selections[loopIndex];
}
Text1.setText(outstring);
}
}
}
/*<applet code=Prac7.class width=400 height=400>
</applet>*/


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8))

import java.awt.event.*;
import java.awt.*;
public class Prac08 extends Frame implements ActionListener
{
TextField t1,t2,t3,t4;
TextArea txt;
Label l1,l2,l3,l4;
Button b1;
public Prac08()
{
FlowLayout F=new FlowLayout();
setLayout(F);
l1=new Label("NAME:");
add(l1);
t1=new TextField(10);
add(t1);
l2=new Label("AGE:");
add(l2);
t2=new TextField(2);
add(t2);
l3=new Label("QUALIFICATION:");
add(l3);
t3=new TextField(10);
add(t3);
l4=new Label("ADDRESS:");
add(l4);
txt=new TextArea(" ",10,20);
add(txt);
b1=new Button("clear");
b1.setBackground(Color.red);
add(b1);
b1.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
try
{
if(e.getSource()==b1)
{
t1.setText(" ");
t2.setText(" ");
t3.setText(" ");
txt.setText(" ");
}
}
catch(Exception ex){}
}
public boolean handleEvent(Event e)
{
if(e.id==Event.WINDOW_DESTROY)
System.exit(0);
return(super.handleEvent(e));
}
public static void main(String args[])
{
Prac08 a=new Prac08();
a.setVisible(true);
a.setSize(300,200);
}
}


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9))

import java.awt.*;
public class MenuDemo extends Frame
{
MenuBar my=new MenuBar();
public MenuDemo()
{
setTitle("MenuBar");
FlowLayout F=new FlowLayout();
setLayout(F);
setMenuBar(my);
Menu fm=new Menu("File");
my.add(fm);
fm.add(new MenuItem("new"));
fm.add(new MenuItem("open"));
fm.add(new MenuItem("save"));
fm.add(new MenuItem("save as"));
fm.add(new MenuItem("Exit"));
Menu em=new Menu("Edit");
my.add(em);
em.add(new MenuItem("undo"));
em.add(new MenuItem("redo"));
em.add(new MenuItem("cut"));
em.add(new MenuItem("copy"));
em.add(new MenuItem("paste"));
em.add(new MenuItem("delete"));
em.add(new MenuItem("select"));
em.add(new MenuItem("select all"));
}
public boolean handleEvent(Event e)
{
if(e.id==Event.WINDOW_DESTROY)
System.exit(0);
return(super.handleEvent(e));
}
public static void main(String args[])
{
MenuDemo m=new MenuDemo();
m.resize(500,500);
}
}


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(program-10):

import java.awt.*;
import java.awt.event.*;
public class MouseExample extends Frame implements MouseListener
{
int x=0,y=0;
String strEvent="";
MouseExample(String title)
{
super(title);
addWindowListener(new MyWindowAdapter(this));
addMouseListener(this);
setSize(300,300);
setVisible(true);
}
public void mouseClicked(MouseEvent e)
{
strEvent="MouseClicked";
x=e.getX();
y=e.getY();
repaint();
}
public void mousePressed(MouseEvent e)
{
strEvent="MousePressed";
x=e.getX();
y=e.getY();
repaint();
}
public void mouseReleased(MouseEvent e)
{
strEvent="MouseReleased";
x=e.getX();
y=e.getY();
repaint();
}
public void mouseEntered(MouseEvent e)
{
strEvent="MouseEntered";
x=e.getX();
y=e.getY();
repaint();
}
public void mouseExited(MouseEvent e)
{
strEvent="MouseExited";
x=e.getX();
y=e.getY();
repaint();
}
public void paint(Graphics g)
{
g.drawString(strEvent+" at"+x+","+y,50,50);
}
public static void main(String args[])
{
MouseExample myWindow=new MouseExample("Window With Mouse Events Example");
}
}
class MyWindowAdapter extends WindowAdapter
{
MouseExample myWindow=null;
MyWindowAdapter(MouseExample myWindow)
{
this.myWindow=myWindow;
}
public void windowClosing(WindowEvent we)
{
myWindow.setVisible(false);
}
}


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(program-11):

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class DrawShapes extends Applet implements MouseListener
{
int x,y,ch;
public void init()
{
addMouseListener(this);
ch=1;
}
public void paint(Graphics g)
{
switch(ch)
{
case 1:
g.drawOval(x,y,50,50);
break;
case 2:
g.drawRect(x,y,60,50);
break;
case 3:
g.drawOval(x,y,140,100);
}
ch++;
if(ch==4)
{
ch=1;
}
showStatus(x+","+y);
}
public void mouseClicked(MouseEvent me)
{
x=me.getX();
y=me.getY();
repaint();
}
public void mouseEntered(MouseEvent me)
{
x=me.getX();
y=me.getY();
repaint();
}
public void mouseExited(MouseEvent me){}
public void mousePressed(MouseEvent me){}
public void mouseReleased(MouseEvent me){}}
/*<applet code="Drawshapes.class" width=350 height=350>
</applet>*/



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(program-12):

import java.io.*;
import java.util.Scanner;
class AppFile
{
public static void main(String args[])
{
try
{
Scanner sc=new Scanner(System.in);
String s;
RandomAccessFile f=new RandomAccessFile("new.txt","rw");
f.seek(f.length());
System.out.println("Enter a string to append into the file");
s=sc.next();
f.writeBytes(s);
f.close();
}
catch(IOException ioe)
{
System.out.println(ioe);
}
}
}


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