The substring( )
method constructs a new
String
object made up from a run of characters
contained somewhere in the original string, the one whose
substring( )
you called. The name of this method,
substring()
, violates the stylistic dictum that
words should be capitalized; if Java were 100.0% consistent, this
would be named subString
. But it’s not;
it’s substring
. The
substring
method is
overloaded:
both forms require a
starting
index. The one-argument form returns
from startIndex
to the end. The two-argument form
takes an ending index (not a length, as in some languages), so that
an index can be generated by the String
methods
indexOf( )
or
lastIndexOf( )
. Note that the end index is one
beyond the last character!
// File SubStringDemo.java public static void main(String[] av) { String a = "Java is great."; System.out.println(a); String b = a.substring(5); // b is the String "is great." System.out.println(b); String c = a.substring(5,7);// c is the String "is" System.out.println(c); String d = a.substring(5,a.length( ));// d is "is great." System.out.println(d); }
This prints the following when run:
> java SubStringDemo Java is great. is great. is is great. >
18.189.189.67