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oops.

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class and object package program ; class demo { int age = 22 ; String name = "ved varshney" ; void show (){     System . out . println ( "age is : " + age + " name is : " + name ); } } public class code { public static void main ( String [] args ) { demo r = new demo (); r . show (); } }   constructor -  Constructor is a special method which name is same as class name .  The main purpose of constructor is to initialize the objects. every java class has constructor. A constructor is automatically called at the time of object creation. A constructor never contain any return type including void. Types- 1 copy 2 default 3 parameterized 4 private parameterized constructor  -  class demo{ int age; String name; demo(int a , String s){ age=a; name=s; System.out.println("age is : "+age +"\nname is : "+name); } } public class Main{ public static void main(String[] args) { demo r = new demo(22,"...
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file handling.

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  package F ile_ H andling ; import java . io .* ; public class CreateFile { // public static void main(String[] args) { // File f= new File("C:\\Users\\vedva\\OneDrive\\Desktop\\ved.txt"); // try{ // if(f.createNewFile()){ //     System.out.println("file successfully created"); // }else{ //     System.out.println("file already exixts.."); // } // }catch(IOException e){ //     System.out.println("ioexception handled.."); // } //} public static void main ( String [] args ) throws IOException { File f = new File ( "C: \\ Users \\ vedva \\ OneDrive \\ Desktop \\ ved.txt" ); if ( f . createNewFile ()){   System . out . println ( "file successfully created" ); } else {     System . out . println ( "file already exixts.." ); } } } package F ile_ H andling ; import java . io .* ; public class FileInfo { public static void main ( String [] args ) { File f = new File ( "C: \\ Users \\ vedva \\ One...
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Spring

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Tree in java

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  package T rees ; class node { int val ; node left ; node right ; public node ( int val ){     this . val = val ; } } public class NodeTree { public static void main ( String [] args ) { node a = new node ( 1 ); node b = new node ( 4 ); node c = new node ( 3 ); node d = new node ( 2 ); node e = new node ( 6 ); node f = new node ( 5 ); a . left = b ; a . right = c ; b . left = d ; b . right = e ; c . right = f ; System . out . print ( "product of all nodes : " ); System . out . print ( product ( a )); System . out . println (); System . out . print ( "product of non-zero elements of nodes : " ); System . out . print ( product2 ( a )); System . out . println (); System . out . print ( "sum of all nodes : " ); System . out . print ( sum ( a )); System . out . println (); System . out . print ( "Maximum Node in tree : " ); System . out . print ( maximum ( a )); System . out . println (); System . out . print ( ...
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