Java 运动字符串法

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public class Main {

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    public static void main(String[] arguments) {

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        String str = " this is a test. this is a test. this is a test?";

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        System.out.println("The string is: " + str);

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        System.out.println("Length of this string: " + str.length());

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        System.out.println("The character at position 6: " + str.charAt(6));

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        System.out.println("The substring from 26 to 32: " + str.substring(26, 32));

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        System.out.println("The index of the first 'a': " + str.indexOf('a'));

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