THE PACKAGE JAVA.LANG

java.lang.String

20.12

20.12.24

public int indexOf(int ch, int fromIndex)

If a character with value

ch

 occurs in the character sequence represented by this

String

 object at an index no smaller than

fromIndex

, then the index of the first

such occurrence is returned that is, the smallest value

k

 such that:

(this.charAt(k) == ch) && (k >= fromIndex)

is

true

. If no such character occurs in this string at or after position

fromIndex

,

then

 1

 is returned.

There is no restriction on the value of

fromIndex

. If it is negative, it has the

same effect as if it were zero: this entire string may be searched. If it is greater

than the length of this string, it has the same effect as if it were equal to the length

of this string:

 1

 is returned.

20.12.25

public int indexOf(String str)

throws NullPointerException

If the string

str

 occurs as a substring of this

String

 object, then the index of the

first character of the first such substring is returned that is, the smallest value

k

such that:

this.startsWith(str, k)

is

true

. If

str

 does not occur as a substring of this string, then

 1

 is returned.

If

str

 is

null

, a

NullPointerException

 is thrown.

20.12.26

public int indexOf(String str, int fromIndex)

throws NullPointerException

If the string

str

 occurs as a substring of this

String

 object starting at an index no

smaller than

fromIndex

, then the index of the first character of the first such sub 

string is returned that is, the smallest value

k

 such that:

this.startsWith(str, k) && (k >= fromIndex)

is

true

. If

str

 does not occur as a substring of this string at or after position

fromIndex

, then

 1

 is returned.

There is no restriction on the value of

fromIndex

. If it is negative, it has the

same effect as if it were zero: this entire string may be searched. If it is greater

than the length of this string, it has the same effect as if it were equal to the length

of this string:

 1

 is returned.

If

str

 is

null

, a

NullPointerException

 is thrown.

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