Length: 1 String: t We can also concatenate an empty string to the character to convert it to a string. Quotes with nothing in between represent an empty string. This is one of the simplest and implicit way to get a String object in Java. public class Demo { public static void main...
The"Java"string is in the"Learn Java programming"string. However,str1.indexOf("Java", 8)returns -1 (string not found). It is because the search starts at index 8 and there is no"Java"in"va programming".
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. fromIndex: the start position wher...
public in indexOf(char ch, int fromIndex) 参数 ch - 一个字符。 fromIndex - 开始搜索的索引。 返回值 返回从 fromIndex 位置开始查找指定字符在字符串中第一次出现处的索引,如果此字符串中没有这样的字符,则返回 -1。 示例 public class Main { public static void main(String args[]) { String Str...
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 Stringstr="Hello World";intindex=str.indexOf('o',5);System.out.println("The index of 'o' starting from index 5 is: "+index);
System.out.println(result);// -1// index of empty string in the stringresult = str1.indexOf(""); System.out.println(result);// 0} } 注意: 字符'a'在"Learn Java"字符串中出现多次。indexOf()方法返回'a'的第一次出现的索引(即 2)。
text/java this.codePointAt(k) == ch </blockquote> is true. In either case, if no such character occurs in this string, then-1is returned. TheStringis searched backwards starting at the last character. Java documentation forjava.lang.String.lastIndexOf(int). Portions of...
public static void main(String[] args){ Scanner scanner=new Scanner(System.in); //① double n=scanner.nextDouble(); //② n=Math.pov(n,2);//n表示底数, 2表示次方 //③ System.out.println(n); } } 1. 2. 3. 4. 5. 6.
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: ...
Find the first occurrence of the letter "e" in a string, starting the search at position 5: publicclassMain{publicstaticvoidmain(String[]args){StringmyStr="Hello planet earth, you are a great planet.";System.out.println(myStr.indexOf("e",5));}} ...