Java CopyindexOf(String str, int fromIndex)StringBuilder类的 indexOf(String str, int fromIndex) 方法是一个内置的方法,用于返回从指定的索引’fromIndex’开始的、作为参数的子串在字符串中第一次出现的索引。如果子串str不存在,则返回-1。 fromIndex 是整数类型的值,指的是开始搜索的索引。这个方法返回的索引...
text/java (this.codePointAt(k) == ch) {@code &&} (k >= fromIndex) </blockquote> is true. In either case, if no such character occurs in this string at or after positionfromIndex, then-1is returned. There is no restriction on the value offromIndex. If it is negative, it has the...
Returns the index within this string of the last occurrence of the specified character. For values of ch in the range from 0 to 0xFFFF (inclusive), the index (in Unicode code units) returned is the largest value k such that: <blockquote> text/java 复制 this.charAt(k) == ch </bl...
The Java string indexOf method is a function that is used to get the integer value of a particular index of String type object, based on a criteria specified in the parameters of the IndexOf method. A typical scenario can be when a system administrator wants to find the index of the ‘...
StringmyStr="Hello planet earth, you are a great planet.";System.out.println(myStr.indexOf("planet")); Try it Yourself » Definition and Usage TheindexOf()method returns the position of the first occurrence of specified character(s) in a string. ...
Stringstr="Hello World";intindex=str.indexOf('W');System.out.println("The index of 'W' in the string is: "+index); 1. 2. 3. 输出结果为: The index of 'W' in the string is: 6 1. 示例2:从指定索引位置开始查找字符在字符串中的索引位置 ...
Java CopylastIndexOf(String str, int fromIndex)StringBuffer类的 lastIndexOf(String str, int fromIndex) 方法是一个内置的方法,用于返回字符串中第一次出现的子串参数的索引,从指定的索引’fromIndex’开始向后搜索。如果子串str不存在,则返回-1。 fromIndex 是整数类型的值,指的是开始搜索的索引,但是这个搜索...
java字符串indexof用法 **Java String indexOf用法** **一、基本用法** In Java, the `indexOf` method in the `String` class is super useful. It helps you find the position of a particular character or a substring within a string. For example, if you have a string like "Hello, world!"...
Java String lastIndexOf Method: The lastIndexOf() method returns the index within this string of the last occurrence of the specified character.
System.out.println(result);// -1// index of empty string in the string result = str1.indexOf(""); System.out.println(result);// 0} } Run Code Notes: The character'a'occurs multiple times in the"Learn Java"string. TheindexOf()method returns the index of the first occurrence of'a...