解析字符串的Java方法

String str = "apple,banana,orange";
String[] fruits = str.split(",");
for (String fruit : fruits) {
    System.out.println(fruit);
}

import java.util.regex.Matcher;
import java.util.regex.Pattern;

String str = "Hello, World!";
Pattern pattern = Pattern.compile("\\b\\w+\\b"); // 匹配单词
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
    System.out.println(matcher.group());
}

String str = "Hello, World!";
String substring = str.substring(7, 12);
System.out.println(substring);

import java.util.StringTokenizer;

String str = "apple,banana,orange";
StringTokenizer tokenizer = new StringTokenizer(str, ",");
while (tokenizer.hasMoreTokens()) {
    System.out.println(tokenizer.nextToken());
}