java-字符串查找

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使用indexOf()查找：str.indexOf(要查找的字符串，int 查找的起始位置)

code：

public class first{public static void main(String[] args){String words="today,monday,sunday";System.out.println("源字符串是:"+words);System.out.println("使用indexOf(\"day\")结果:"+words.indexOf("day"));System.out.println("使用indexOf(\"day\",5)结果:"+words.indexOf("day",5));System.out.println("使用indexOf(\"o\")结果:"+words.indexOf("o"));System.out.println("使用indexOf(\"o\",6)结果:"+words.indexOf("o",6));}}

使用lastindexOf()查找，从右往左查找，如果不指定起始索引，默认从末尾开始

public class first{public static void main(String[] args){String words="today,monday,sunday";System.out.println("源字符串是:"+words);System.out.println("使用lastIndexOf(\"day\")结果:"+words.lastIndexOf("day"));System.out.println("使用lastIndexOf(\"day\",5)结果:"+words.lastIndexOf("day",5));System.out.println("使用lastIndexOf(\"o\")结果:"+words.lastIndexOf("o"));System.out.println("使用lastIndexOf(\"o\",6)结果:"+words.lastIndexOf("o",6));}}

根据索引查找charAt(索引值)直接查找字符

public class first{public static void main(String[] args){String words="today,monday,sunday";System.out.println(words.charAt(0));System.out.println(words.charAt(1));System.out.println(words.charAt(8));}}

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