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...
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 ‘...
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...
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...
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!"...
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. ...
1.String.indexOf()API TheString.indexOf()in Java returns the index location of a specified character or string. TheindexOf()method is an overloaded method and accepts two arguments: substringorch: the substring that needs to be located in the current string. ...
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...
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...