Finds last occurrence of character in CharSequence starting from index start. - Java java.lang

Java examples for java.lang:String Index

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Description

Finds last occurrence of character in CharSequence starting from index start.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        CharSequence val = "java2s.com";
        char c = 'a';
        System.out.println(lastIndexOf(val, c));
    }//from   w  w w.  j av a  2  s .c  o  m

    /**
     * Finds last occurrence of character in CharSequence starting from index start.
     *
     * @param val       Sequence to search for character
     * @param c         Character to search for
     * @param start     Starting index in sequence to search
     * @return          Index in sequence where character is found or -1
     *                  if it wasn't found
     */
    public static int lastIndexOf(CharSequence val, char c, int start) {
        int res = -1;
        int i = start;
        if (val.length() <= i)
            i = val.length() - 1;
        for (; 0 <= i; --i) {
            if (val.charAt(i) == c) {
                res = i;
                break;
            }
        }
        return res;
    }

    /**
     * Finds last occurrence of character in CharSequence starting from the beginning.
     *
     * @param val       Sequence to search for character
     * @param c         Character to search for
     * @return          Index in sequence where character is found or -1
     *                  if it wasn't found
     */
    public static int lastIndexOf(CharSequence val, char c) {
        return lastIndexOf(val, c, val.length() - 1);
    }
}

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