Here you can find the source of lastIndexOf(String str, char searchChar)
public static int lastIndexOf(String str, char searchChar)
//package com.java2s; public class Main { public static int lastIndexOf(String str, char searchChar) { if ((str == null) || (str.length() == 0)) { return -1; }// ww w . j av a 2 s . c om return str.lastIndexOf(searchChar); } public static int lastIndexOf(String str, char searchChar, int startPos) { if ((str == null) || (str.length() == 0)) { return -1; } return str.lastIndexOf(searchChar, startPos); } public static int lastIndexOf(String str, String searchStr) { if ((str == null) || (searchStr == null)) { return -1; } return str.lastIndexOf(searchStr); } public static int lastIndexOf(String str, String searchStr, int startPos) { if ((str == null) || (searchStr == null)) { return -1; } return str.lastIndexOf(searchStr, startPos); } }