Life Cycle of an Applet along with response

Life Cycle of an Applet, along with response to mouse events and other simple features. (ps: only two possible examples for life circle of an Applet)

Demonstrating the Life Cycle of an Applet: Simple 0

import java. applet. *; import java. awt. event. *; public class Simple 0 extends Applet { String. Buffer buffer; public void init() { buffer = new String. Buffer(); add. Item("initializing. . . "); } public void start() { add. Item ("starting. . . "); } public void stop() { add. Item("stopping. . . "); } public void destroy() { add. Item("preparing for unloading. . . "); void add. Item(String new. Word) { System. out. println(new. Word); buffer. append(new. Word); repaint() } }

public void paint(Graphics g) { g. set. Color(new Color(200, 1, 200)); g. draw. Rect(0, 0, get. Size(). width - 1, get. Size(). height - 1); //Draw the current string inside the rectangle g. set. Color(Color. blue); g. draw. String(buffer. to. String(), 5, 15); } }

Demonstrates Life Cycle of an Applet + Mouse Events: Simple 1

import java. awt. *; import java. awt. event. *; public class Simple 1 extends Applet { String. Buffer buffer; public void init() { add. Mouse. Listener(new Bob()); buffer = new String. Buffer(); add. Item("initializing. . . "); } public void start() { add. Item("starting. . . ") ; } public void stop() { add. Item("stopping. . . "); } public void destroy() { add. Item("preparing for unloading. . . "); void add. Item(String new. Word) { System. out. println(new. Word); buffer. append(new. Word); }

public void paint(Graphics g) { g. set. Color(new Color(200, 1, 200)); g. draw. Rect(0, 0, get. Size(). width - 1, get. Size(). height - 1); g. set. Color(Color. blue); g. draw. String(buffer. to. String(), 5, 15); } private class Bob implements Mouse. Listener { public void mouse. Entered(Mouse. Event event) { } public void mouse. Exited(Mouse. Event event) { } public void mouse. Pressed(Mouse. Event event) { } public void mouse. Released(Mouse. Event event) { } public void mouse. Clicked(Mouse. Event event) { add. Item("click!. . . "); } } }

Three simple applet examples

A method which returns the volume of a cube import java. awt. *; import java. applet. Applet; public class volume extends Applet { public void paint(Graphics g) { float answer = area. Cube(7, 4, 2); g. draw. String("Area of cube is " +answer, 100); } private float area. Cube(float height, float width, float depth) { float area = height*width*depth; return area; } }

Draws a circle based on a given center position and radius import java. awt. *; import java. applet. Applet; public class Draw. Circle extends Applet { public void paint(Graphics g) { circle(g, 150, 135, 120); //call circle function } //end function //function draws a circle private void circle(Graphics g, int x. Centre, int y. Centre, int radius) { int horiz = x. Centre - radius; //finds starting horizon. position int vert = y. Centre - radius; //finds starting vertical position int diameter = radius * 2; //finds diameter g. draw. Oval(horiz, vert, diameter); } //end function }

import java. awt. *; import java. awt. event. *; import java. applet. *; Drawing Houses public class draw. House extends Applet { public void paint(Graphics g) { int wall=50; //allows you to change the size of the house and have them still be 10 pixels apart draw. Street(g, wall, 20, 100); draw. Street(g, wall, 20+wall+10, 100); draw. Street(g, wall, 20+wall*2+20, 100); draw. Street(g, wall, 20+wall*3+30, 100); } private void draw. Street(Graphics g, int wall. Height, int bottom. X, int bottom. Y) { g. draw. Rect(bottom. X, bottom. Y, wall. Height); g. draw. Line(bottom. X+wall. Height, bottom. Y, bottom. X+wall. Height/2, bottom. Y-wall. Height/2); g. draw. Line(bottom. X+wall. Height/2, bottom. Y-wall. Height/2, bottom. X, bottom. Y); } }

A more complex applet example

Converts temperature Celsius to Fahrenheit within 100 degrees with a scrollbar import java. awt. *; import java. applet. Applet; import java. awt. event. *; public class Temp extends Applet implements Adjustment. Listener { private Scrollbar Convert. Celc; //scrollbar named arbitrarily as Convert. Celc private float Convert. Celc. Value = 0; //Convert. Celc. Value is a float because of the transformation formula public void init() { Label title 1; title 1 = new Label("degrees C. . . to. . . degrees F"); //label scrollbar add(title 1); Convert. Celc= new Scrollbar (Scrollbar. HORIZONTAL, 0, 101); add(Convert. Celc); Convert. Celc. add. Adjustment. Listener (this); } //end init

public void paint(Graphics g) { float c. CF; c. CF = ((Convert. Celc. Value*1. 8 f) +32); //calculate the conversion g. draw. String("Celcius = “ +Convert. Celct. Value + “ Fahrenheit =“ +c. CF , 0, 75); //draw text } //end paint public void adjustment. Value. Changed(Adjustment. Event e) { Convert. Celc. Value = (float) Convert. Celc. get. Value(); //slider gets value of conversion and placement of bar repaint(); } //end adujustment. Value. Changed } //end all