Java lastindexof and indexof Methods

Lastindexof Method

Returns the position where the substring of the string object appears.

Strobj. lastindexof (substring [, startindex])

Parameters
Strobj

Required. String object or text.

Substring

Required. The substring to be searched in the string object.

Startindex

Optional. This integer indicates the starting index position of the string object. If omitted, the search starts from the end of the string.

Description
The lastindexof method returns an integer indicating the starting position of the substring in the string object. If no substring is found,-1 is returned.

If startindex is negative, startindex is treated as zero. If it is larger than the index at the largest character location, it is regarded as the largest possible index.

Search from right to left. Otherwise, the method is the same as indexof.

The following example illustrates how to use the lastindexof method:

Function lastindexdemo (str2)
{
VaR str1 = "babebibobubabebibobu"
VaR S = str1.lastindexof (str2 );
Return (s );
}

Str2 = "ob ";
S = 17;

Indexof Method

Returns the first occurrence of a substring in a string object.

Strobj. indexof (substring [, startindex])

Parameters
Strobj

Required. String object or text.

Substring

Required. The substring to be searched in the string object.

Starindex

Optional. This integer indicates the index in the string object. If omitted, search from the start of the string.

Description
The indexof method returns an integer indicating the starting position of the substring in the string object. If no substring is found,-1 is returned.

If startindex is negative, startindex is treated as zero. If it is larger than the index at the largest character location, it is regarded as the largest possible index.

Search from left to right. Otherwise, this method is the same as lastindexof.

Example
The following example illustrates how to use the indexof method.

Function indexdemo (str2 ){
VaR str1 = "babebibobubabebibobu"
VaR S = str1.indexof (str2 );
Return (s );
}

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