Summary of Classes and Interfaces - Absolute Java - page 1202

public int indexOf(String aString, int start)
Returns the index (position) of the fi rst occurrence of the string aString in the calling object
string that occurs at or after position start. Positions are counted 0, 1, 2, etc. Returns −1 if
aString is not found.
EXAMPLE
After program executes String name = "Mary, Mary quite contrary";
name.indexOf("Mary", 1) returns 6 .
The same value is returned if 1 is replaced by any number up to and including 6 .
name.indexOf("Mary", 0) returns 0 .
name.indexOf("Mary", 8) returns −1 .
Throws:
NullPointerException if aString is null .
public int lastIndexOf(String aString)
Returns the index (position) of the last occurrence of the string aString in the calling object
string. Positions are counted 0, 1, 2, etc. Returns − 1 if aString is not found.
EXAMPLE
After program executes String name = "Mary, Mary, Mary quite so";
greeting.indexOf("Mary") returns 0 , and
name.lastIndexOf("Mary") returns 12 .
Throws:
NullPointerException if aString is null .
public int length()
Returns the length of the calling object (which is a string) as a value of type int.
EXAMPLE
After program executes String greeting = "Hello!";
greeting.length() returns 6 .
public String substring( int start)
Returns the substring of the calling object string starting from start through to the end of the
calling object. Positions are counted 0, 1, 2, etc. Be sure to notice that the character at position
start is included in the value returned.
EXAMPLE
After program executes String sample = "AbcdefG";
sample.substring(2) returns "cdefG" .
Throws:
IndexOutOfBoundsException if start is negative or larger than the length of the
calling object.