20.12

java.lang.String

THE PACKAGE JAVA.LANG

20.12.20

public boolean startsWith(String prefix)

throws NullPointerException

The result is

true

 if and only if the character sequence represented by the argu 

ment is a prefix of the character sequence represented by this

String

 object.

If

prefix

 is

null

, a

NullPointerException

 is thrown.

Note that the result will be

true

 if the argument is an empty string or is equal

to this

String

 object as determined by the

equals

 method ( 20.12.9).

20.12.21

public boolean startsWith(String prefix, int toffset)

throws NullPointerException

The result is

true

 if and only if the character sequence represented by the argu 

ment is a prefix of the substring of this

String

 object starting at index

toffset

.

If

prefix

 is

null

, then a

NullPointerException

 is thrown.

The result is

false

 if

toffset

 is negative or greater than the length of this

String

 object; otherwise, the result is the same as the result of the expression

this.subString(toffset).startsWith(prefix)

20.12.22

public boolean endsWith(String suffix)

throws NullPointerException

The result is

true

 if and only if the character sequence represented by the argu 

ment is a suffix of the character sequence represented by this

String

 object.

If

suffix

 is

null

, then a

NullPointerException

 is thrown.

Note that the result will be

true

 if the argument is an empty string or is equal

to this

String

 object as determined by the

equals

 method ( 20.12.9).

20.12.23

public int indexOf(int ch)

If a character with value

ch

 occurs in the character sequence represented by this

String

 object, then the index of the first such occurrence is returned that is, the

smallest value

k

 such that:

this.charAt(k) == ch

is

true

. If no such character occurs in this string, then

 1

 is returned.

540