Java StringBuffer lastIndexOf()方法

java.lang.StringBuffer.lastIndexOf(String str, int fromIndex)方法返回指定子字符串最后一次出现的字符串中的索引fromIndex参数是从中开始搜索的索引。

1 语法

public int lastIndexOf(String str, int fromIndex)

2 参数

str ： 这是要搜索的子字符串。

fromIndex ： 这是开始搜索的索引。

3 返回值

此方法返回指定子字符串最后一次出现的此序列中的索引。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * Java Enum compareTo()方法
 */
import java.lang.*;
public class StringBufferDemo {
   public static void main(String[] args) {
      StringBuffer buff = new StringBuffer("tutorials point");
      System.out.println("buffer = " + buff);
      /* returns the index within this string of the rightmost occurrence of the
         specified substring */
      System.out.println("last index of i = " + buff.lastIndexOf("i"));
      // returns index as the substring is found with fromIndex 10
      System.out.print("last index of als = ");
      System.out.println(buff.lastIndexOf("als",10));
      // returns -1 as fromIndex 2 can't find the substring 
      System.out.print("last index of ori = "); 
      System.out.println(buff.lastIndexOf("ori",2));  
   }
}

输出结果为：

buffer = tutorials point
last index of i = 12
last index of als = 6
last index of ori = -1