Stringstr="Hello, World!";// 定义字符串charch='o';// 定义要查找的字符 1. 2. 2. 使用indexOf()方法查找字符 Java中的String类提供了一个名为indexOf()的方法,用于查找字符串中第一次出现的指定字符或子字符串的位置。如果找到了,它将返回字符的索引;如果没有找到,它将返回-1
Learn how to find the last index of a particular word in a string using Java. This guide provides clear examples and explanations for better understanding.
public class Main { public static void main(String[] argv) { String str = "java2s.com"; char searchChar = 'o'; System.out.println(lastIndexOf(str, searchChar)); }/*w ww. j av a 2 s . c om*/ public static int lastIndexOf(String str, char searchChar) { if (isEmpty(str)...
index() rindex() 分别用来返回当前字符串指定范围中首次和最后一次出现的位置,如果不存在则抛出异常; count() 用来返回一个字符串在当前字符串中出现的次数,不存在返回0; print('Java, Python, C++, R, Go'.find('o')) print('Java, Python, C++, R, Go'.rfind('o')) ...
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 ...
使用@ExtensionMethod 注解简化从 Map<String, Object> 中获取 Integer 和 Long 类型的值 使用@ExtensionMethod 注解简化从 Map 中获取 Integer 和 Long 类型的值 在 Java 编程中,我们经常需要从 Map 中获取特定类型的值。...本文将介绍如何使用 Lombok 的 @ExtensionMethod 注解来简化这一过程,并提供一个...
findIndex() 方法返回数组中通过测试的第一个元素的索引(作为函数提供)。 findIndex() 方法对数组中存在的每个元素执行一次函数: 如果找到函数返回 true 值的数组元素,则 findIndex() 返回该数组元素的索引(并且不检查剩余值) 否则返回 -1 注释:findIndex() 不会为没有值的数组元素执行函数。
You can determine which version of the JDK is the default by typingjava -versionin aTerminalwindow. If the installed version is 7u55, you will see a string that includes the text1.7.0_55. For example: java -version java version "1.7.0_55" ...
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This post will discuss how to find indexes of all occurrences of a character in a string in Java. 1. Using indexOf() and lastIndexOf() method The String class provides an indexOf() method that returns the index of the first appearance of a character in a string. 1 2 3 4 5 6 7...