Java 8 programs

 

Programs 👇👇👇

1.Write a java program that works as a simple calculator. Use a GridLayout to arrangeButtons for digits and for the + - * % operations. Add a text field to display the result. Handle any possible exceptions like divide 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"); 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(""); } 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(""); } } }

2.Write an applet program that displays a simple message

importjava.awt.*; import java.applet.*; public class Applet1 extends Applet { // Paint method to display the message. public void paint(Graphics g) { g.drawString("HELLO WORLD",20,20); }} //Applet1.html: /* <applet code="Applet1" width=200 height=300></applet>*/

Write a java program that Develop an applet that receives an integer in one text field, and computes its factorial Value and returns it in another text field, when the button named “Compute” is clicked

import java.awt.*; import java.awt.event.*; import java.applet.Applet; public class Fact extends Applet implements ActionListener { Label l1,l2; TextField t1,t2; Button b1; public void init() { l1=new Label("enter the value"); add(l1); t1=new TextField(10); add(t1); b1=new Button("Factorial"); add(b1); b1.addActionListener(this); l2=new Label("Factorial of given no is"); add(l2); t2=new TextField(10); add(t2); } public void actionPerformed(ActionEvent e) { if(e.getSource()==b1) { int fact=fact(Integer.parseInt(t1.getText())); t2.setText(String.valueOf(fact)); } } int fact(int f) { int s=0; if(f==0) return 1; else return f*fact(f-1); } } /*<applet code="Fact.class" height=300 width=300></applet>*/

3. Write a program that creates a user interface to perform integer divisions. The userenters two numbers in the text fields, Num1 and Num2. The division of Num1 and Num2 is displayed in the Result field when the Divide button is clicked. If Num1 or Num2 were not an integer, the program would throw Number Format Exception. If Num2 were Zero, the program would throwan Arithmetic Exception Display the exception in a message dialog box.

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) { 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"; repaint(); } else if((num1<0)||(num2<0)) { try { System.out.println(""); } catch(Exception e) { System.out.println("NumberFormat"+e); } msg="NumberFormat"; repaint(); } else { int num3=num1/num2; res.setText(String.valueOf(num3)); } } } public void paint(Graphics g) { g.drawString(msg,30,70); } }

4. Write a Java program that implements a multithreaded program has three threads. First thread generates a 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.

import java.io.*; import java.util.*; class First1 extends Thread { public void run() { for(;;) { int roll; Random d = new Random(); roll = d.nextInt(200) + 1; System.out.println(roll); Thread t2=new Second2(roll); Thread t3=new Third3(roll); try { Thread.sleep(1000); if(roll%2==0) t2.start(); else t3.start(); } catch(InterruptedException e){} } } } class Second2 extends Thread { int r1; Second2(int r) { r1=r; } public void run() { System.out.println("The square of number"+r1+"is:"+r1*r1); } } class Third3 extends Thread { int r1; Third3(int r) { r1=r; } public void run() { System.out.println("The Cube of the Number"+r1+"is: "+r1*r1*r1); } } class Mthread { public static void main(String[] args) { Thread t1=new First1(); System.out.println("press Ctrl+c to stop......"); t1.start(); } }

5. Write a java program to create an abstract class named shape that contains twointegers and an empty method named printArea() Provide three classes named Rectangle,, Triangle and Circle such that each one of the classes extends the class shape. Each one of the class contains only the method printArea() that print the area of the given shape.

// Abstract class that contains abstract method. abstract class Shape { int h=10,w=5; abstract void printArea(); } // Classes that illustrates the abstract method. class Rectangle extends Shape { void printArea() { double area=0.5*h*w; System.out.println("The Area of rectangle is"+area); } } class Triangle extends Shape { void printArea() { double area=h*w; System.out.println("The Area of Triangle is"+area); } } class Circle extends Shape { void printArea() { System.out.println("Circle area is not possibles "); } } // Class that create objects and call the method. class ShapeDemo1 { public static void main(String args[]) { Rectangle obj1 = new Rectangle (); Triangle obj2 = new Triangle (); Circle obj3 = new Circle (); obj1. printArea (); obj2. printArea (); obj3. printArea (); } }

6. Write a java program that handles all mouse events and shows the event name at thecenter of the window when mouse event is fired(Use Adapter classes).

import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="AdapterDemo1" width=300 height=100></applet>*/ public class AdapterDemo1 extends Applet { String msg="welcome"; int mouseX=30,mouseY=30; public void init() { addMouseListener(new MyMouseAdapter1(this)); addMouseMotionListener(new MyMouseMotionAdapter1(this)); } public void paint(Graphics g) { g.drawString(msg, mouseX, mouseY); } } class MyMouseAdapter1 extends MouseAdapter { AdapterDemo1 adapterDemo; public MyMouseAdapter1(AdapterDemo1 adapterDemo) { this.adapterDemo = adapterDemo; } // Handle mouse clicked. public void mouseClicked(MouseEvent me) { adapterDemo.msg="Mouse clicked.";adapterDemo.repaint(); } public void mouseEntered(MouseEvent me) { adapterDemo.msg = "Mouse entered.";adapterDemo.repaint(); } } class MyMouseMotionAdapter1 extends MouseMotionAdapter { AdapterDemo1 adapterDemo; int mouseX,mouseY; public MyMouseMotionAdapter1(AdapterDemo1 adapterDemo) { this.adapterDemo = adapterDemo; } // Handle mouse dragged. public void mouseDragged(MouseEvent me) { // save coordinates mouseX = me.getX(); mouseY= me.getY(); adapterDemo.msg = "Mouse Dragged"; adapterDemo.showStatus("Dragging mouse at " + mouseX +" " + mouseY); adapterDemo.repaint(); } }

7. Write a Java program that correctly implements the producer – consumer problem using the concept of interthread communication

class Q { int n; boolean valueSet=false; synchronized int get() { if(!valueSet) try { wait(); } catch(InterruptedException e) { System.out.println("Interrupted Exception caught"); } System.out.println("Got:"+n); valueSet=false; notify(); return n; } synchronized void put(int n) { if(valueSet) try { wait(); } catch(InterruptedException e) { System.out.println("Interrupted Exception caught"); } this.n=n; valueSet=true; System.out.println("Put:"+n); notify(); } } class Producer implements Runnable { Q q; Producer(Q q) { this.q=q; new Thread(this,"Producer").start(); } public void run() { int i=0; while(true) { q.put(i++); } } } class Consumer implements Runnable { Q q; Consumer(Q q) { this.q=q; new Thread(this,"Consumer").start(); } public void run() { while(true) { q.get(); } } } class ProdCons { public static void main(String[] args) { Q q=new Q(); new Producer(q); new Consumer(q); System.out.println("Press Control-c to stop"); } }

8. Write a Java program that implements Bubble sort algorithm for sorting in descending order and also shows the number of interchanges occurred for the given set of integers.

import java.util.Scanner; class BubbleSortExample { public static void main(String []args) { int num, i, j, temp; Scanner input = new Scanner(System.in); System.out.println("Enter the number of integers to sort:"); num = input.nextInt(); int array[] = new int[num]; System.out.println("Enter " + num + " integers: "); for (i = 0; i < num; i++) array[i] = input.nextInt(); int count=0; for (i = 0; i < ( num - 1 ); i++) { for (j = 0; j < num - i - 1; j++) { if (array[j] < array[j+1]) { temp = array[j]; array[j] = array[j+1]; array[j+1] = temp; count++; } } } System.out.println("Sorted list of integers:"); for (i = 0; i < num; i++) System.out.println(array[i]); System.out.println("Number of interchanges occured are "+count); } }