INTRODUCTION TO OBJECTS AND INPUT/OUTPUT - Java Programming: From Problem Analysis to Program Design - page 125

EXAMPLE 3-2

Consider the following statements:
String sentence;
String str1;
String str2;
int index;

3

sentence = "Now is the time for the birthday party.";
The following statements further show how String methods work.

Statement Effect / Explanation

sentence.charAt(16)

Returns: 'f'
In sentence , the character at position 16
is 'f' .

sentence.length()

Returns: 38
The number of characters in sentence is 38.

sentence.indexOf('t')

Returns: 7
This is the index of the first 't' in
sentence .

sentence.indexOf("for")

Returns: 16
In sentence , the starting index of the
string "for" .

sentence.substring(0, 6) Returns: "Now is"

In sentence , the substring starting at index
0 until the index 5 (= 6 - 1) is "Now is" .

sentence.substring(7, 12) Returns: "the t"

In sentence , the substring starting at index
7 until the index 11 (= 12 - 1) is "the t" .

sentence.substring(7, 22) Returns: "the time for th"

In sentence , the substring starting at index
7 until the index 21 (= 22 - 1) is "the
time for th" .

sentence.substring(4, 10) Returns: "is the"

In sentence , the substring starting at index
4 until the index 9 (= 10 - 1) is "is the" .

str1 = "Now is t"
In sentence , the substring starting at index 0
until the index 7 (= 8 - 1) is "Now is t" .So
the value assigned to str1 is "Now is t" .

str1 = sentence.substring(0, 8);