JavaString indexOf()方法示例 publicclassIndexOfExample{publicstaticvoidmain(Stringargs[]){Stringstr1=newString("This is a BeginnersBook tutorial");Stringstr2=newString("Beginners");Stringstr3=newString("Book");Stringstr4=newString("Books");System.out.println("Index of B in str1: "+str1.i...
publicStringgetSubstring(String text,int start,int end){// 假设传入的end参数大于字符串的长度returntext.substring(start,end);// 这里可能会抛出StringIndexOutOfBoundsException}publicstaticvoidmain(String[]args){String result=getSubstring("Hello, World!",7,20);// 错误:索引20超出了字符串的长度System...
异常信息示例:java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 0 这个异常一般发生在以下几种情况下: 当我们使用负数作为索引时,例如String str = "Hello"; char c = str.charAt(-1); 当我们使用大于等于字符串长度的索引时,例如String str = "Hello"; char c = str.charAt(10); ...
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...
in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1at java.lang.String.charAt(String.java:658)at java.util.regex.Matcher.appendReplacement(Matcher.java:762)at java.util.regex.Matcher.replaceAll(Matcher.java:906)at java.lang.String.replaceAll(String.java:...
List<String>list=newArrayList<>();list.add("Apple");list.add("Banana");// 用户输入的索引为3,超出了有效范围String fruit=list.get(3);// 这里会抛出IndexOutOfBoundsException 二、可能出错的原因 导致java.lang.IndexOutOfBoundsException的原因主要包括以下几种: ...
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. ...
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 ...
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...
String are immutable in Java. You can't change them. You need to create a new string with the character replaced. String myName = "domanokz"; String newName= myName.substring(0,4)+'x'+myName.substring(5); or you can use a StringBuilder: ...