Important Methods in String class

Here most common used String Methods Discussed Here

• charAt() - Returns the Character located at at the specified index for Example :
  String x="Computer";
  System.out.println(x.charAt(2)); // output is 'm'


• concat() - Appends one String to the end of another ("+" also works), ex:
  String x="motor";
  System.out.println(x.concat(" cab")); // output is "motor cab"
  


• equalIgnoreCase() - Determines the equality of two Strings,ignoring case.
  String x = "HERO"
  System.out.println(x.equalIgnoreCase("Hero"));    //is "true"
  System.out.println(x.equalIgnoreCase("reho"));    is "false"
  


• length() - Returns the number of characters in a String.
  String x="Computer"
  System.out.println(x.length());      //     is 8
  


• replace() - Replaces occurences of character with a new character
  


• substring () - Returns a part of String
  String x = "0123456789"
  System.out.println(x.substring(5));     // output is "56789"
  System.out.println(x.substring(5,8));     //output is "567"
  


• toLowerCase() - Returns a String with uppercase characters converted
  String x= "COMPUTERS";
  System.out.println(x.lowerCase());   //output is "computers"
  


• toString() - returns the value of String
  String x = "Rama";
  System.out.println(x.toString());     // for your exercise buddy...
  


• toUpperCase() - Returns a String with lowercase characters converted
  String x= "science";
  System.out.println(x.lowerCase());   //output is "SCIENCE"
  


• trim() - Removes white spaces from ends of the String
  String x = " hi ";
  System.out.println(x + "x");    // result is " hi x"
  System.out.println(x.trim() + "x");    // result is " hix"