{"id":10104,"date":"2015-08-03T08:00:08","date_gmt":"2015-08-03T12:00:08","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/?p=10104"},"modified":"2015-08-04T10:06:26","modified_gmt":"2015-08-04T14:06:26","slug":"example-java-programs","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=10104","title":{"rendered":"Example Java Programs"},"content":{"rendered":"<pre><strong>HelloWorld.java<\/strong><\/pre>\n<hr \/>\n<pre>\r\n\r\npublic class HelloWorld {\r\n\r\n\u00a0\u00a0\u00a0 \/\/ method main(): ALWAYS the APPLICATION entry point\r\n\u00a0\u00a0\u00a0 public static void main (String[] args) {\r\n\u00a0\u00a0 \u00a0System.out.println (\"Hello World!\");\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\/\/ Print Today's Date\r\nimport java.util.*;\r\n\r\npublic class HelloDate {\r\n\u00a0\u00a0\u00a0 public static void main (String[] args) {\r\n\u00a0\u00a0 \u00a0System.out.println (\"Hello, it's: \");\r\n\u00a0\u00a0 \u00a0System.out.println(new Date());\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\/\/example: function call in Java\r\npublic class FunctionCall {\r\n\r\n\u00a0\u00a0\u00a0 public static void funct1 () {\r\n\u00a0\u00a0 \u00a0System.out.println (\"Inside funct1\");\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public static void main (String[] args) {\r\n\u00a0\u00a0 \u00a0int val;\r\n\r\n\u00a0\u00a0 \u00a0System.out.println (\"Inside main\");\r\n\r\n\u00a0\u00a0 \u00a0funct1();\r\n\r\n\u00a0\u00a0 \u00a0System.out.println (\"About to call funct2\");\r\n\r\n\u00a0\u00a0 \u00a0val = funct2(8);\r\n\r\n\u00a0\u00a0 \u00a0System.out.println (\"funct2 returned a value of \" + val);\r\n\r\n\u00a0\u00a0 \u00a0System.out.println (\"About to call funct2 again\");\r\n\r\n\u00a0\u00a0 \u00a0val = funct2(-3);\r\n\r\n\u00a0\u00a0 \u00a0System.out.println (\"funct2 returned a value of \" + val);\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public static int funct2 (int param) {\r\n\u00a0\u00a0 \u00a0System.out.println (\"Inside funct2 with param \" + param);\r\n\u00a0\u00a0 \u00a0return param * 2;\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\/\/Array in Java\r\npublic class ArrayDemo {\r\n\u00a0\u00a0\u00a0 public static void main(String[] args) {\r\n\u00a0\u00a0 \u00a0int[] anArray;\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ DECLARE an array of integers\r\n\r\n\u00a0\u00a0 \u00a0anArray = new int[10];\u00a0\u00a0 \u00a0\/\/ CREATE an array of integers\r\n\r\n\u00a0\u00a0 \u00a0\/\/ assign a value to each array element \r\n\u00a0\u00a0 \u00a0for (int i = 0; i &lt; anArray.length; i++) {\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0anArray[i] = i;\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0 \u00a0\/\/ print a value from each array element\r\n\u00a0\u00a0 \u00a0for (int i = 0; i &lt; anArray.length; i++) {\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 System.out.print(anArray[i] + \" \");\r\n\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0 \u00a0System.out.println();\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\/\/class usage in Java\r\nclass Point2d {\r\n\u00a0\u00a0\u00a0 \/* The X and Y coordinates of the point--instance variables *\/\r\n\u00a0\u00a0\u00a0 private double x;\r\n\u00a0\u00a0\u00a0 private double y;\r\n\u00a0\u00a0\u00a0 private boolean debug;\u00a0\u00a0 \u00a0\/\/ A trick to help with debugging\r\n\r\n\u00a0\u00a0\u00a0 public Point2d (double px, double py) { \/\/ Constructor\r\n\u00a0\u00a0 \u00a0x = px;\r\n\u00a0\u00a0 \u00a0y = py;\r\n\r\n\u00a0\u00a0 \u00a0debug = false;\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ turn off debugging\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public Point2d () {\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ Default constructor\r\n\u00a0\u00a0 \u00a0this (0.0, 0.0);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Invokes 2 parameter Point2D constructor\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 \/\/ Note that a this() invocation must be the BEGINNING of\r\n\u00a0\u00a0\u00a0 \/\/ statement body of constructor\r\n\r\n\u00a0\u00a0\u00a0 public Point2d (Point2d pt) {\u00a0\u00a0 \u00a0\/\/ Another consructor\r\n\u00a0\u00a0 \u00a0x = pt.getX();\r\n\u00a0\u00a0 \u00a0y = pt.getY();\r\n\r\n\u00a0\u00a0 \u00a0\/\/ a better method would be to replace the above code with\r\n\u00a0\u00a0 \u00a0\/\/\u00a0\u00a0\u00a0 this (pt.getX(), pt.getY());\r\n\u00a0\u00a0 \u00a0\/\/ especially since the above code does not initialize the\r\n\u00a0\u00a0 \u00a0\/\/ variable debug.\u00a0 This way we are reusing code that is already\r\n\u00a0\u00a0 \u00a0\/\/ working.\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public void dprint (String s) {\r\n\u00a0\u00a0 \u00a0\/\/ print the debugging string only if the \"debug\"\r\n\u00a0\u00a0 \u00a0\/\/ data member is true\r\n\u00a0\u00a0 \u00a0if (debug)\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0 System.out.println(\"Debug: \" + s);\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public void setDebug (boolean b) {\r\n\u00a0\u00a0 \u00a0debug = b;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public void setX(double px) {\r\n\u00a0\u00a0 \u00a0dprint (\"setX(): Changing value of X from \" + x + \" to \" + px );\r\n\u00a0\u00a0 \u00a0x = px;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public double getX() {\r\n\u00a0\u00a0 \u00a0return x;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public void setY(double py)\u00a0 {\r\n\u00a0\u00a0 \u00a0dprint (\"setY(): Changing value of Y from \" + y + \" to \" + py );\r\n\u00a0\u00a0 \u00a0y = py;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public double getY() {\r\n\u00a0\u00a0 \u00a0return y;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public void setXY(double px, double py) {\r\n\u00a0\u00a0 \u00a0setX(px);\r\n\u00a0\u00a0 \u00a0setY(py);\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public double distanceFrom (Point2d pt) {\r\n\u00a0\u00a0 \u00a0double dx = Math.abs(x - pt.getX());\r\n\u00a0\u00a0 \u00a0double dy = Math.abs(y - pt.getY());\r\n\r\n\u00a0\u00a0 \u00a0\/\/ check out the use of dprint()\r\n\u00a0\u00a0 \u00a0dprint (\"distanceFrom(): deltaX = \" + dx);\r\n\u00a0\u00a0 \u00a0dprint (\"distanceFrom(): deltaY = \" + dy);\r\n\r\n\u00a0\u00a0 \u00a0return Math.sqrt((dx * dx) + (dy * dy));\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public double distanceFromOrigin () {\r\n\u00a0\u00a0 \u00a0return distanceFrom (new Point2d ( ));\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public String toStringForXY() {\r\n\u00a0\u00a0 \u00a0String str = \"(\" + x + \", \" + y;\r\n\u00a0\u00a0 \u00a0return str;\r\n\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0\u00a0\u00a0 public String toString() {\r\n\u00a0\u00a0 \u00a0String str = toStringForXY() + \")\";\r\n\u00a0\u00a0 \u00a0return str;\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\r\n\/\/read integer from Keyboard\r\nimport java.io.*;\r\nimport java.util.*;\r\n\r\npublic class KeyboardIntegerReader {\r\n\r\n\u00a0public static void main (String[] args) throws java.io.IOException {\r\n\u00a0 String s1;\r\n\u00a0 String s2;\r\n\u00a0 int num = 0;\r\n\r\n\u00a0 \/\/ set up the buffered reader to read from the keyboard\r\n\u00a0 BufferedReader br = new BufferedReader (new InputStreamReader (\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.in));\r\n\r\n\u00a0 boolean cont = true;\r\n\r\n\u00a0 while (cont)\r\n\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.print (\"Enter an integer:\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 s1 = br.readLine();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 StringTokenizer st = new StringTokenizer (s1);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 s2 = \"\";\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 while (cont &amp;&amp; st.hasMoreTokens())\r\n\u00a0\u00a0 \u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 try \r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 s2 = st.nextToken();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 num = Integer.parseInt(s2);\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 cont = false;\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 catch (NumberFormatException n)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"The value in \\\"\" + s2 + \"\\\" is not an \r\n\r\ninteger\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0\u00a0\u00a0 }\r\n\r\n\u00a0 System.out.println (\"You entered the integer: \" + num);\r\n\u00a0}\r\n}\r\n\r\n\r\n\/\/read data from keyboard\r\nimport java.io.*;\r\nimport java.util.*;\r\n\r\npublic class KeyboardReader\r\n{\r\n\r\n\u00a0public static void main (String[] args) throws java.io.IOException\r\n\u00a0{\r\n\r\n\u00a0 String s1;\r\n\u00a0 String s2;\r\n\r\n\u00a0 double num1, num2, product;\r\n\r\n\u00a0 \/\/ set up the buffered reader to read from the keyboard\r\n\u00a0 BufferedReader br = new BufferedReader (new InputStreamReader (\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.in));\r\n\r\n\u00a0 System.out.println (\"Enter a line of input\");\r\n\r\n\u00a0 s1 = br.readLine();\r\n\r\n\u00a0 System.out.println (\"The line has \" + s1.length() + \" characters\");\r\n\r\n\u00a0 System.out.println ();\r\n\u00a0 System.out.println (\"Breaking the line into tokens we get:\");\r\n\r\n\u00a0 int numTokens = 0;\r\n\u00a0 StringTokenizer st = new StringTokenizer (s1);\r\n\r\n\u00a0 while (st.hasMoreTokens())\r\n\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 s2 = st.nextToken();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 numTokens++;\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println (\"\u00a0\u00a0\u00a0 Token \" + numTokens + \" is: \" + s2);\r\n\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0}\r\n}\r\n\r\n\r\n\/\/read from file\r\nimport java.io.*;\r\nimport java.util.*;\r\n\r\npublic class MyFileReader\r\n{\r\n\r\n\u00a0public static void main (String[] args) throws java.io.IOException\r\n\u00a0{\r\n\r\n\u00a0 String s1;\r\n\u00a0 String s2;\r\n\r\n\u00a0 \/\/ set up the buffered reader to read from the keyboard\r\n\u00a0 BufferedReader br = new BufferedReader (new FileReader \r\n\r\n(\"MyFileReader.txt\"));\r\n\r\n\u00a0 s1 = br.readLine();\r\n\r\n\u00a0 System.out.println (\"The line is \" + s1);\r\n\u00a0 System.out.println (\"The line has \" + s1.length() + \" characters\");\r\n\r\n\u00a0 System.out.println ();\r\n\u00a0 System.out.println (\"Breaking the line into tokens we get:\");\r\n\r\n\u00a0 int numTokens = 0;\r\n\u00a0 StringTokenizer st = new StringTokenizer (s1);\r\n\r\n\u00a0 while (st.hasMoreTokens())\r\n\u00a0\u00a0\u00a0\u00a0 {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 s2 = st.nextToken();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 numTokens++;\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println (\"\u00a0\u00a0\u00a0 Token \" + numTokens + \" is: \" + s2);\r\n\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0}\r\n}\r\n\r\n\r\n\/\/exception handling in Java\r\n\r\npublic class HelloWorldException {\r\n\u00a0\u00a0\u00a0 public static void main (String[] args) throws Exception {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(\"Bienvenitos!\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 throw new Exception(\"Generic Exception\");\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n\r\n\r\n\r\n\/\/exception handling\r\n\r\n\r\nimport java.io.*;\r\nimport java.util.*;\r\n\r\n\/** Causes a compilation error due to an unhandled Exception\r\n\u00a0*\/\r\npublic class KeyboardReaderError {\r\n\r\n\u00a0 public static void main (String[] args) { \/\/ throws java.io.IOException\r\n\r\n\u00a0\u00a0\u00a0 String s1;\r\n\u00a0\u00a0\u00a0 String s2;\r\n\r\n\u00a0\u00a0\u00a0 double num1, num2, product;\r\n\r\n\u00a0\u00a0\u00a0 \/\/ set up the buffered reader to read from the keyboard\r\n\u00a0\u00a0\u00a0 BufferedReader br = new BufferedReader (new InputStreamReader \r\n\r\n(System.in));\r\n\r\n\u00a0\u00a0\u00a0 System.out.println (\"Enter a line of input\");\r\n\u00a0\u00a0 \u00a0\r\n\u00a0\u00a0\u00a0 \/* Following line triggers the error.\u00a0 Error will show the type of\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unhandled exception and where the call occurs *\/\r\n\u00a0\u00a0\u00a0 s1 = br.readLine();\r\n\r\n\u00a0\u00a0\u00a0 System.out.println (\"The line has \" + s1.length() + \" characters\");\r\n\r\n\u00a0\u00a0\u00a0 System.out.println ();\r\n\u00a0\u00a0\u00a0 System.out.println (\"Breaking the line into tokens we get:\");\r\n\r\n\u00a0\u00a0\u00a0 int numTokens = 0;\r\n\u00a0\u00a0\u00a0 StringTokenizer st = new StringTokenizer (s1);\r\n\r\n\u00a0\u00a0\u00a0 while (st.hasMoreTokens()) {\r\n\u00a0\u00a0 \u00a0s2 = st.nextToken();\r\n\u00a0\u00a0 \u00a0numTokens++;\r\n\u00a0\u00a0 \u00a0System.out.println (\"\u00a0\u00a0\u00a0 Token \" + numTokens + \" is: \" + s2);\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0 }\r\n}\r\n\r\n\/\/encounters an error\r\n\r\nimport java.io.*;\r\n\r\n\/\/ This program shows a stack track that occurs when java\r\n\/\/ encounters a terminal error when running a program.\r\n\r\npublic class DivBy0\r\n{\r\n\r\n\u00a0public static void funct1 ()\r\n\u00a0{\r\n\u00a0 System.out.println (\"Inside funct1()\");\r\n\r\n\u00a0 funct2();\r\n\u00a0}\r\n\r\n\u00a0public static void main (String[] args)\r\n\u00a0{\r\n\u00a0 int val;\r\n\r\n\u00a0 System.out.println (\"Inside main()\");\r\n\r\n\u00a0 funct1();\r\n\r\n\u00a0}\r\n\r\n\u00a0public static void funct2 ()\r\n\u00a0{\r\n\u00a0 System.out.println (\"Inside funct2()\");\r\n\u00a0 int i, j, k;\r\n\r\n\u00a0 i = 10;\r\n\u00a0 j = 0;\r\n\r\n\u00a0 k = i\/j;\r\n\u00a0}\r\n\r\n}\r\n\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>HelloWorld.java public class HelloWorld { \u00a0\u00a0\u00a0 \/\/ method main(): ALWAYS the APPLICATION entry point \u00a0\u00a0\u00a0 public static void main (String[] args) { \u00a0\u00a0 \u00a0System.out.println (&#8220;Hello World!&#8221;); \u00a0\u00a0\u00a0 } } \/\/ Print Today&#8217;s Date import java.util.*; public class HelloDate { \u00a0\u00a0\u00a0 public static void main (String[] args) { \u00a0\u00a0 \u00a0System.out.println (&#8220;Hello, it&#8217;s: &#8220;); \u00a0\u00a0 \u00a0System.out.println(new Date()); &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=10104\">Continue reading<\/a><\/p>\n","protected":false},"author":130,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1417,1424],"tags":[706,308,1182,285,1181],"class_list":["post-10104","post","type-post","status-publish","format-standard","hentry","category-code-programming-samples--","category-javaj2eej2me","tag-code","tag-java","tag-program","tag-285","tag-1181","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":26864,"url":"http:\/\/bangla.sitestree.com\/?p=26864","url_meta":{"origin":10104,"position":0},"title":"Example Java Programs #Programming Code Examples #Java\/J2EE\/J2ME #J2SE","author":"Author-Check- Article-or-Video","date":"May 3, 2021","format":false,"excerpt":"Very Simple Java Example Programs HelloWorld.java public class HelloWorld { \/\/ method main(): ALWAYS the APPLICATION entry point public static void main (String[] args) { System.out.println (\"Hello World!\"); } } \/\/ Print Today's Date import java.util.*; public class HelloDate { public static void main (String[] args) { System.out.println (\"Hello, it's:\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10546,"url":"http:\/\/bangla.sitestree.com\/?p=10546","url_meta":{"origin":10104,"position":1},"title":"Statics.java Demonstrates static and non-static methods.","author":"","date":"August 29, 2015","format":false,"excerpt":"*\/ public class Statics { \u00a0public static void main(String[] args) 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Programming Samples . \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae \u0989\u09a6\u09be\u09b9\u09b0\u09a8&quot;","block_context":{"text":"Code . 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