The Java.lang.String.subSequence() is a built-in function in Java that returns a CharSequence. CharSequence that is a subsequence of this sequence. The subsequence starts with the char value at the specified index and ends with the char value at (end-1). The length (in chars) of the returned sequence is (end-start, so if start == end then an empty sequence is returned.
public CharSequence subSequence(int start, int end) Parameters: start - This is the index from where the subsequence starts, it is inclusive. end - This is the index where the subsequence ends, it is exclusive.
It returns the specified subsequence in range [start, end).
Errors and Exceptions:
IndexOutOfBoundsException – It throws this error if start or end are negative, if end is greater than length(), or if start is greater than end.
Program 1: To show working of Java.lang.String.subSequence() function.
Returns: Welcome Returns: geeksforgeeks
Program 2: To show error of Java.lang.String.subSequence() function when index is negative
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1960) at java.lang.String.subSequence(String.java:2003) at Gfg.main(File.java:15)
Program 3: To show error of Java.lang.String.subSequence() function when index is out of range.
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 50 at java.lang.String.substring(String.java:1963) at java.lang.String.subSequence(String.java:2003) at Gfg.main(File.java:16)
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