Manav Goyal

String - Java

  • Basic
    • Immutable => Unmodifiable or Unchangeable
      • ClassLoader
      • Thread Safe
      • Security
      • Heap Space
    • Methods to Create
      • String Constant Pool => Using "",Duplicate value is not created
      • Heap => Using new keyword
  • Commands
    • String varS = new String("abc12") => Initialize a new String
    • String varS = varS1 + varS2 => Concatenate/Join 2 or more Strings to create a new String
    • varS.length() => Returns the length of the String
    • varS.charAt(N) => Returns the Character preset at the given Index
    • varS.replace('S1', 'S2') => Replaces 'S1' in the given String by 'S2' and Returns the new String without changing the old String
    • varS.substring(N1, N2) => Creates a String from "n1" index to "n2" and Returns it, "n2" is not included
      • varS.substring (N)
    • varS.equals("abc") => Returns true if both are equal
    • varS.isEmpty() => Returns true if String is empty
    • varS.toLowerCase()
    • varS.indexOf(‘C’)
    • varS.strip()
      • varS.stripLeading()
      • varS. stripTrailing()
    • varS.isBlank ()
    • varS.repeat(N)
    • String varS = String.valueOf(varS1); => Converts Character Array into String
    • String varS = String.copyValueOf(varS1); => Converts Character Array into String
    • String varS = String.copyValueOf(varS1, N1, N2); => Convert Character Array from n1 to n2 into String
    • String varS = toString(varS1); => Converts Character Array into String
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