Java lastIndexOf () method
There are four forms lastIndexOf () method:
public int lastIndexOf (int ch): Returns the characters in this string of the last index appears if no such character string, it returns -1.
public int lastIndexOf (int ch, int fromIndex): return Returns the specified character index within this string of the last occurrence, if no such character string, it returns -1.
public int lastIndexOf (String str): Returns the characters in this string of the last index appears if no such character string, it returns -1.
public int lastIndexOf (String str, int fromIndex): Returns the characters in this string of the last index appears if no such character string, it returns -1.
grammar
public int lastIndexOf(int ch) 或 public int lastIndexOf(int ch, int fromIndex) 或 public int lastIndexOf(String str) 或 public int lastIndexOf(String str, int fromIndex)
parameter
ch - the character.
fromIndex - the index to start the search.
str - the substring to search for.
return value
Index value of the first occurrence of the specified substring in the string.
Examples
public class Test {
public static void main(String args[]) {
String Str = new String("本教程:www.w3big.com");
String SubStr1 = new String("w3big");
String SubStr2 = new String("com");
System.out.print("查找字符 o 最后出现的位置 :" );
System.out.println(Str.lastIndexOf( 'o' ));
System.out.print("从第14个位置查找字符 o 最后出现的位置 :" );
System.out.println(Str.lastIndexOf( 'o', 14 ));
System.out.print("子字符串 SubStr1 最后出现的位置:" );
System.out.println( Str.lastIndexOf( SubStr1 ));
System.out.print("从第十五个位置开始搜索子字符串 SubStr1最后出现的位置 :" );
System.out.println( Str.lastIndexOf( SubStr1, 15 ));
System.out.print("子字符串 SubStr2 最后出现的位置 :" );
System.out.println(Str.lastIndexOf( SubStr2 ));
}
}
The above program execution results:
查找字符 o 最后出现的位置 :17 从第14个位置查找字符 o 最后出现的位置 :13 子字符串 SubStr1 最后出现的位置:9 从第十五个位置开始搜索子字符串 SubStr1最后出现的位置 :9 子字符串 SubStr2 最后出现的位置 :16