NRI INSTITUTE OF TECHNOLOGY

Size: px

Start display at page:

Download "NRI INSTITUTE OF TECHNOLOGY"

Louise Carter
6 years ago
Views:

1 NRI INSTITUTE OF TECHNOLOGY KOTHUR, NEAR GUDUR GATE, HYDERABAD, A.P Java Programming Lab Manual B. Tech, CSE, II Year II Sem DEPARTMENT OF COMPUTER SCIENCE &ENGINEERING

2 DEPARTMENT OF COMPUTER SCIENCE &ENGINEERING CERTIFICATE This is to certify that this is a bonafide work in Java Programming Lab Labaratory had done by Mr/Ms bearing of Roll No in the department of CSE of NRI Institute Of Technilogy during the II sem of B.tech IInd year for the academic year Number of Experiments Conducted:.. Number of experiments Attended:. Lab Incharge Head Of The Department External 2

3 INDEX S. No Contents Page. no s

4 1.program Use Eclipse or Netbean platform and acquaint with the various menus create the test project add a test class and run it see how you can use auto suggestions auto fill try the code formatter and code refactoring like renaming variables methods and classes. Try debug step by step one if else condition and a for loop. import javax.swing.*; import java.awt.graphics; /* <html> <body> <applet code="choice.class" width=500 height=500> </applet> </body> </html> */ public class choice extends JApplet int i,ch; public void init() String input; input=joptionpane.showinputdialog ("enter your choice( 1-lines,2-rectangles,3-ovals)"); ch=integer.parseint(input); public void paint(graphics g) switch(ch) case 1: for(i=1;i<=10;i++) g.drawline(10,10,250,10*i); break; case 2: for(i=1;i<=10;i++) g.drawrect(10*i,10*i,50+10*i,50+10*i); 4

5 break; case 3: for(i=1;i<=10;i++) g.drawoval(10*i,10*i,50+10*i,50+10*i); break; 5

6 2) program Write a java program that works as a simple calculator.use a grid layout to arrage buttons for the digits and for the +,-,*,% operations add a text field to display the result.handle any possible exceptions like divided by zero. import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="cal" width=300 height=300> </applet> */ public class Cal extends Applet implements ActionListener String msg=" "; int v1,v2,result; TextField t1; Button b[]=new Button[10]; Button add,sub,mul,div,clear,mod,eq; char OP; public void init() Color k=new Color(120,89,90); setbackground(k); t1=new TextField(10); GridLayout gl=new GridLayout(4,5); setlayout(gl); for(int i=0;i<10;i++) b[i]=new Button(""+i); add=new Button("add"); sub=new Button("sub"); mul=new Button("mul"); div=new Button("div"); mod=new Button("mod"); clear=new Button("clear"); EQ=new Button("EQ"); 6

7 t1.addactionlistener(this); add(t1); for(int i=0;i<10;i++) add(b[i]); add(add); add(sub); add(mul); add(div); add(mod); add(clear); add(eq); for(int i=0;i<10;i++) b[i].addactionlistener(this); add.addactionlistener(this); sub.addactionlistener(this); mul.addactionlistener(this); div.addactionlistener(this); mod.addactionlistener(this); clear.addactionlistener(this); EQ.addActionListener(this); public void actionperformed(actionevent ae) String str=ae.getactioncommand(); char ch=str.charat(0); if ( Character.isDigit(ch)) t1.settext(t1.gettext()+str); else if(str.equals("add")) v1=integer.parseint(t1.gettext()); OP='+'; t1.settext(""); else if(str.equals("sub")) v1=integer.parseint(t1.gettext()); OP='-'; t1.settext(""); 7

8 else if(str.equals("mul")) v1=integer.parseint(t1.gettext()); OP='*'; t1.settext(""); else if(str.equals("div")) v1=integer.parseint(t1.gettext()); OP='/'; t1.settext(""); else if(str.equals("mod")) v1=integer.parseint(t1.gettext()); OP='%'; t1.settext(""); if(str.equals("eq")) v2=integer.parseint(t1.gettext()); if(op=='+') result=v1+v2; else if(op=='-') result=v1-v2; else if(op=='*') result=v1*v2; else if(op=='/') result=v1/v2; else if(op=='%') result=v1%v2; t1.settext(""+result); if(str.equals("clear")) t1.settext("");

9 3A)program Develop an applet in java that display a simple message import java.awt.*; import java.applet.*; /*<applet code="hellojava" width=300 height=50> </applet>*/ public class Hellojava extends Applet public void paint(graphics g) g.drawstring("welcome to Applet",20,20); 9

10 3B) program Develop an applet in java that receives an integer in one text field and computes its factorial value and retuns it in another text field when the button named compute is clicked. /* <applet code="fact.java" width=300 height=100> </applet> */ import java.awt.*; import java.applet.*; import java.awt.event.*; public class Fact extends Applet implements ActionListener int n,f=1; Button compute; TextField t1; String s1,s2; public void init() t1=new TextField(); compute = new Button("compute"); add(t1); add(compute); t1.settext("0"); compute.addactionlistener(this); public void actionperformed(actionevent ae) String s=ae.getactioncommand(); if(s.equals("compute")) s1=t1.gettext(); n=integer.parseint(s1); while(n!=0) f*=n; n--; s2=string.valueof(f); 10

11 public void paint(graphics g) g.drawstring("factorial:"+s2,6,50); )program Write a java program that creats a user interface to perform integer division. import java.awt.*; import java.awt.event.*; import java.applet.*; /*<applet code="div"width=230 height=250> </applet>*/ public class Div extends Applet implements ActionListener String msg; TextField num1,num2,res;label l1,l2,l3; Button div; public void init() l1=new Label("Number 1"); l2=new Label("Number 2"); l3=new Label("result"); num1=new TextField(10); num2=new TextField(10); res=new TextField(10); div=new Button("DIV"); div.addactionlistener(this); add(l1); add(num1); add(l2); add(num2); add(l3); add(res); add(div); public void actionperformed(actionevent ae) 11

12 String arg=ae.getactioncommand(); if(arg.equals("div")) String s1=num1.gettext(); String s2=num2.gettext(); int num1=integer.parseint(s1); int num2=integer.parseint(s2); if(num2==0) try System.out.println(" "); catch(exception e) System.out.println("ArithematicException"+e); msg="arithemetic"; else if((num1<0) (num2<0)) try System.out.println(""); catch(exception e) System.out.println("NumberFormat"+e); msg="numberformat"; else int num3=num1/num2; res.settext(string.valueof(num3)); public void paint(graphics g) g.drawstring(msg,30,70); 12

13 ) program Write a java program that implement a multi-thread application that has three threads.first thread generates random integer every 1 second and if the value is even,second thread computes the square of the number and prints.if the value is odd,the third thread will print the value of cube of the number. class A extends Thread synchronized public void run() try while(true) sleep(1000); System.out.println("good morning"); catch(exception e) class B extends Thread synchronized public void run() try while(true) sleep(2000); System.out.println("hello"); catch(exception e) 13

14 class C extends Thread synchronized public void run() try while(true) sleep(3000); System.out.println("welcome"); catch(exception e) class ThreadDemo public static void main(string args[]) A t1=new A(); B t2=new B(); C t3=new C(); t1.start(); t2.start(); t3.start();

15 7) program Write a java program that simulates a traffic light.the program lets the user select one of three lights:red,yellow,green with radio buttons. import java.awt.*; import java.awt.event.*; import java.applet.*; /*<applet code="signal" width=300 height=100> </applet>*/ public class Signal extends Applet implements ItemListener Checkbox red,yellow,green; Light light; public void init() Panel p1=new Panel(); p1.setsize(200,200); p1.setlayout(new FlowLayout()); p1.add(light=new Light()); light.setsize(40,90); Panel p2=new Panel(); p2.setlayout(new FlowLayout()); CheckboxGroup g=new CheckboxGroup(); p2.add(red=new Checkbox("red",g,false)); p2.add(yellow=new Checkbox("yellow",g,false)); p2.add(green=new Checkbox("green",g,false)); add("center",p1); add("south",p2); red.additemlistener(this); yellow.additemlistener(this); green.additemlistener(this); public void itemstatechanged(itemevent ie) if(red.getstate()) light.red(); 15

16 if(yellow.getstate()) light.yellow(); if(green.getstate()) light.green(); class Light extends Canvas private boolean red; private boolean yellow; private boolean green; public Light() red=false; yellow=false; green=false; public void red() red=true; yellow=false; green=false; public void yellow() red=false; yellow=true; green=false; public void green() red=false; yellow=false; green=true; public void paint(graphics g) if(red) 16

17 g.setcolor(color.red); g.filloval(10,10,20,20); g.setcolor(color.black); g.drawoval(10,35,20,20); g.drawoval(10,60,20,20); g.drawrect(5,5,30,86); else if(yellow) g.setcolor(color.yellow); g.filloval(10,35,20,20); g.setcolor(color.black); g.drawrect(5,5,30,80); g.drawoval(10,10,20,20); g.drawoval(10,60,20,20); else if(green) g.setcolor(color.green); g.filloval(10,60,20,20); g.setcolor(color.black); g.drawrect(5,5,30,80); g.drawoval(10,10,20,20); g.drawoval(10,35,20,20); else g.setcolor(color.black); g.drawrect(5,5,30,80); g.drawoval(10,10,20,20); g.drawoval(10,35,20,20); g.drawoval(10,60,20,20);

18 8) program Write a java program to creat an abstract class named shape that contains two integrs and an empty method named printarea(). abstract class shape void numberofsides() System.out.println("This is for abstract class"); class Trapezoid extends shape void numberofsides() System.out.println("It is having 4 sides"); class Triangle extends shape void numberofsides() System.out.println("it is having 3 sides"); class Hexagonal extends shape void numberofsides() System.out.println("it is having 6 sides"); class AbstractDemo public static void main(string args[]) Trapezoid tz=new Trapezoid(); Triangle t=new Triangle(); Hexagonal h=new Hexagonal(); 18

19 tz.numberofsides(); t.numberofsides(); h.numberofsides(); ) program Write a java program that handles all mouse events and shows the vent name at the center of the window when a mouse event is fired.(use adapter class) import java.awt.*; import java.awt.event.*; import java.applet.*; /*<applet code="mouseeventdemo " width=300 height=100> </applet> */ public class MouseEventDemo extends Applet implements MouseListener, MouseMotionListener String msg=" "; int mousex=0,mousey=0; public void init() addmouselistener(this); addmousemotionlistener(this); public void mouseclicked(mouseevent me) mousex=0; mousey=10; msg="mouse clicked by me"; public void mouseentered(mouseevent me) mousex=0; mousey=10; msg="mouse entered by me"; 19

20 public void mouseexited(mouseevent me) mousex=0; mousey=10; msg="mouse exited by me"; public void mousepressed(mouseevent me) mousex=me.getx(); mousey=me.gety(); msg="down"; showstatus(msg+"at"+mousex+","+mousey); public void mousereleased(mouseevent me) mousex=me.getx(); mousey=me.gety(); msg="up"; showstatus(msg+"at"+mousex+" "+mousey); public void mousedragged(mouseevent me) mousex=me.getx(); mousey=me.gety(); msg="*"; showstatus("dragging the mouse at"+mousex+","+mousey); public void mousemoved(mouseevent me) msg="mouse moved"; showstatus("mouse moved at"+me.getx()+","+me.gety()); public void paint(graphics g) g.drawstring(msg,mousex,mousey); 20

21 11) program Write a java program that load names and phone numbers from a text file where tha data is organized as one line per record and each field in a record are separated by a tab(\t). import java.awt.*; import javax.swing.*; /* <applet code = "JTableDemo" width = 400 height=200> </applet> */ public class JTableDemo extends JApplet public void init() //Get Content Pane Container contentpane = getcontentpane(); //set layout manger contentpane.setlayout(new BorderLayout()); //Initialize column headings final String[] colheads = "Name", "Phone", "Fax" ; //Initialize data final Object[][] data = "Gail", "4567", "8675", "Keen", "7566", "5555", "Viviane", "5674", "5887", "Anne", "1237", "3333", "John", "5656", "3144", "Ellen", "1134", "5335", "Gail", "4567", "8675", "Keen", "7566", "5555", "Viviane", "5674", "5887", "Anne", "1237", "3333", "John", "5656", "3144", "Ellen", "1134", "5335" ; //Create the table JTable table = new JTable(data, colheads); //Add table to a scroll pane 21

22 int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED ; int h = ScrollPaneConstants. HORIZONTAL_SCROLLBAR_AS_NEEDED ; JScrollPane jsp = new JScrollPane(table, v, h); // Add scroll pane to the content pane contentpane.add(jsp, BorderLayout.CENTER); 22

Week -1. Try debug step by step with small program of about 10 to 15 lines which contains at least one if else condition and a for loop.

Week -1. Try debug step by step with small program of about 10 to 15 lines which contains at least one if else condition and a for loop. Week -1 Try debug step by step with small program of about 10 to 15 lines which contains at least one if else condition and a for loop. Java Code import java.util.scanner; public class TestPrime public