public class Main { public static void main(String[] args) { String str = "Hello, World!"; char ch = 'W'; String sub = "World"; int index1 = str.indexOf(ch); int index2 = str.indexOf(sub); System.out.println("The index of '" + ch + "' in the string is: " + index...
3.indexOf方法的使用示例 下面通过一些具体的示例来说明indexOf方法的使用。 示例1:查找字符在字符串中的索引位置 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 ...
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...
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 where the search begins in ...
String target, int fromIndex) { return indexOf(source, sourceOffset, sourceCount, target.value, 0, target.value.length, fromIndex); } /** * Code shared by String and StringBuffer to do searches. The * source is the character array being searched, and the target ...
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...
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...
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 Code:// Define a public class named Exercise21. public class Exercise21 { // Define the main method. public static void main(String[] args) { // Declare and initialize a string variable. String str = "The quick brown fox jumps over the lazy dog."; // Get the index of all ...
Write a Java program to find the index of the first unique character in a given string. Assume that there is at least one unique character in the string. Pictorial Presentation: Sample Solution: Java Code: importjava.util.*;publicclassSolution{publicstaticvoidmain(String[]args){// Test the ...