String的LastIndexof方法用于查找任何字符或者子字符串的最后索引。

LastIndexof方法可以将char或者string作为参数，也可以提供fromIndex。

方法：

public int lastIndexof(int ch)返回字符串中最后一次发生字符的索引

public int lastIndexof(int ch，int flowindex)返回字符串中最后一次发生字符的索引，从特定索引"fromIndex"public int lastIndexof(string)返回字符串公共INT lastIndexof中的子字符串的最后一次发生索引(Int Ch， int flofind)返回字符串内最后一次发生的子字符串的索引，从特定索引"fromIndex"后退

All lastIndexOf methods return -1 if char or substring is not present in the String

字符串索引示例：

package org.igi.theitroad;
 
public class StringLastIndexOfExample {
 /*
  * @ Author : igi Mandliya
  */
 public static void main(String args[]) {
  
  String str="Hello world from theitroad";
  //Using lastIndexOf method with character
  System.out.println("---------------------------------------------------");
  System.out.println("Using lastIndexOf method with character");
  System.out.println("---------------------------------------------------");
  
  System.out.println("Last index of character l in "Hello world from theitroad" is : "+str.lastIndexOf('l'));
  System.out.println();
  
  String str1="from";
  System.out.println("---------------------------------------------------");
  System.out.println("Using lastIndexOf method with fromIndex with character");
  System.out.println("---------------------------------------------------");
  System.out.println("Last index of character o from index 6 in "Hello world from theitroad" is : "+str.lastIndexOf('o',6));
  System.out.println();
  
  //Using lastIndexOf method with String
  System.out.println("---------------------------------------------------");
  System.out.println("Using lastIndexOf method with String");
  System.out.println("---------------------------------------------------");
  
  System.out.println("Last index of String "from" in "Hello world from theitroad" is : "+str.lastIndexOf(str1));
  System.out.println();
  
  String howDo="How do you do";
  System.out.println("---------------------------------------------------");
  System.out.println("Using lastIndexOf method with fromIndex with String");
  System.out.println("---------------------------------------------------");
  System.out.println("Last index of String "do" from index 9 in "How do you do" is : "+howDo.lastIndexOf("do",9));
  System.out.println();
  
  System.out.println("---------------------------------------------------");
  System.out.println("If String or char is not available");
  System.out.println("---------------------------------------------------");
  System.out.println("Last index of "from" in "How do you do" is : "+howDo.lastIndexOf("from"));
  
  
 }
}

运行上面的程序时，我们将得到以下输出：

-------------------
--------------------------------------------------
Using lastIndexOf method with character
--------------------------------------------------
Last index of character l in "Hello world from theitroad" is : 23
 
--------------------------------------------------
Using lastIndexOf method with fromIndex with character
--------------------------------------------------
Last index of character o from index 6 in "Hello world from theitroad" is : 4
 
--------------------------------------------------
Using lastIndexOf method with String
--------------------------------------------------
Last index of String "from" in "Hello world from theitroad" is : 12
 
--------------------------------------------------
Using lastIndexOf method with fromIndex with String
--------------------------------------------------
Last index of String "do" from index 9 in "How do you do" is : 4
 
--------------------------------------------------
If String or char is not available
--------------------------------------------------
Last index of "from" in "How do you do" is : -1