JD_Testing

 Array ===== We can store multiple values of similar datatypes in a single variable Similar datatypes Index based Index starts from 0 to n-1. Array syntax ============= DataType variable [] = new Datatype [Size]; 2D Array ========================== DataType variable [ ] [ ] = new Datatype [size] [size]; DisAdvantages of ------------------ We can store only the similar datatypes once we fixed the size we cant modified memory wastage is high normal enhanced forloop (for each) ================================== index based value based condition set        no condition Chances of error    less chance of error

 String Methods: =============== length();                                 - to find the length of the string  toUpperCase();                            - to convert the lowerCase into upperCase toLowerCase();                            - to convert the upperCase into LowerCase indexOf('char');                          - to get a index position of particular letter(first occurred) lastIndexOf('char');                      - to get a index position of particular letter(last occurred) charAt(index);                            - to get a particular character from string by...

 String Types -------------- Literal String  Non literal String Immutable Mutable Literal String: --------- String s1 = "welcome"; String s2 = "welcome"; Incase of the duplicate, it will share the same memory location. It is stored inside the string pool or string constant System ---->identityHashCode()---> memory address Non Literal -------------------- String s2 = new String ("welcome"); String s3 = new String ("welcome"); Incase of duplicate It will not share the same memory location. it will share the different memory location.  . It is stored in the heap memory. ------------------------------------- Immutable --------- same as the literal string String s="welcome"; we use concat method. While join or any action on the immutable String, it will not share first string  memory value Mutable ------- same as non literal string but use StringBuffer or StringBuilder StringBuffer s = new StringBuffer("welcome");    //   Str...

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