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There are two ways you can convert a String into long in Java

  1. Using Long.parseLong(String input) - This returns primitive int
    String input = "12345678";
    long output = Long.parseLong(input);
    System.out.println(output);
    
  2. Using Long.valueOf(String input) - This returns instance of Long type
    String input = "12345678";
    Long output = Long.valueOf(input);
    System.out.println(output);
    
    Note: Code will through NumberFormatException if you do not pass a valid long String. Ex. if you pass 123.23 that causes NumberFormatException.



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