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
String 方法 閱讀英文 儲存 共用方式為 Facebookx.comLinkedIn電子郵件 String.IndexOf Method Reference Feedback Definition Namespace: Java.Lang Assembly: Mono.Android.dll Overloads 展開資料表 IndexOf(Int32) Returns the index within this string of the first occurrence of the specified character. ...
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 ‘...
Example: Java String lastIndexOf(String str) Method The following example shows the usage of java String() method. public class Example { public static void main(String args[]) { String str = "This is an example of lastIndexOF, from w3resource.com"; System.out.println(); System.out.pr...
publicclassStringPerformanceTest{publicstaticvoidmain(String[]args){Stringstr="Hello, World!";longstartTime=System.currentTimeMillis();for(inti=0;i<10000;i++){str.substring(1,5);}longendTime=System.currentTimeMillis();System.out.println("Substring method time: "+(endTime-startTime)+" ms")...
Java中String类下indexOf方法的使用 str.indexOf(String substr); 用来查询str中字符substr的位置,起始位置为0,若str中不存在substr,则返回-1 。 例: publicclassTest1 { publicstaticvoidmain(String[] args) { //TODO Auto-generated method stub String str = "1234567890";...
classMain{publicstaticvoidmain(String[] args){ String str1 ="Java is fun";intresult;// getting index of character 's' result = str1.indexOf('s'); System.out.println(result); } }// Output: 6 Syntax of indexOf() The syntax of the StringindexOf()method either ...
intindexOf(intch)intindexOf(intch,intfromIndex)intindexOf(Stringstr)intindexOf(Stringstr,intfromIndex) 1. 2. 3. 4. ch:要搜索的字符值或字符 str:要搜索的字符串 fromIndex:开始搜索的索引位置(可选参数,默认为0) 2.indexOf方法的返回值
s.indexOf("a", 1) 这行的意思是 从字符串s里寻找字母a的位置，但寻找的时候要从s的索引为1的位置开始，这就是第二个参数1的作用，由于索引是从0开始的，这样实际寻找的时候是从字母b开始的，这样肯定就找不到a了，所以输出了-1，-1的意思就是没有找到。说的有点啰嗦 你...
AbstractStringBuilder.IndexOf Method Reference Definition Namespace: Java.Lang Assembly: Mono.Android.dll Overloads IndexOf(String, Int32) Returns the index within this string of the first occurrence of the specified substring, starting at the specified index. ...