How to install jdk and fix javac cmd.

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+indexof(ch:char)

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Return type int. Returns the index of the first occurrence of ch in the string. Returns-1 if not matched. import java.lang.String; class indexof{                         public static void main(String[] args){                          String str="Welcome to java";                         int i="welcome".indexOf('l');                        System.out.println("Index of l in \" "+str+"\"  is : "+i);                      } } Output :    Index of l in "Welcome to java is : 2
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Double Linked List-C++....

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#include <iostream> #include <conio.h> using namespace std; struct node     {      int data;      node *prev, *next;     }*q, *temp, *start=NULL; int c1, c2 ; void create(); void display(); void insert(); void del(); int  main() {       while(1)     {                   cout <<" \t\t ******* MAIN MENU ******\n" ;                 cout <<"Press 1 for adding data \n" ;                 cout <<"Press 2 for displaying data \n" ;                 cout <<"Press 3 for insertion \n" ;                 cout <<"Press 4 for deletion \n" ;                 cout <<"Press 0 for exit\n\nAns. " ;     ...
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String Length, Characters, and Combining Strings

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The String class provides the methods for obtaining length, retrieving individual characters, and concatenating strings. java.lang.String +length();                   return type int +charAt(index : int);   return type char +concat(str1 : String);    return type String The String class contains the methods for getting string length, individual characters and combing strings. You can get the length of a string by invoking its length() method. Click here for example . You can retrieve a specific character from a string by using charAt(index :  int) method. Click here for example. Note : -   A string value is represented using a private array variable internally. The array cannot be accessed outside of the String class. The String class provides many public methods, such as length() and charAt(index), to retrieve the array information. This is a good example of encapsulation: the data fi...
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