Java中字符串替换的4种方法代码举例

public class ReplaceExample {
    public static void main(String[] args) {
        String original = "Hello, World!";
        String replaced = original.replace("World", "Java");
        System.out.println(replaced);  // 输出: Hello, Java!
    }
}

public class ReplaceAllExample {
    public static void main(String[] args) {
        String original = "Hello, World! Welcome to the World of Java.";
        String replaced = original.replaceAll("World", "Java");
        System.out.println(replaced);  // 输出: Hello, Java! Welcome to the Java of Java.
    }
}

public class ReplaceFirstExample {
    public static void main(String[] args) {
        String original = "Hello, World! Welcome to the World of Java.";
        String replaced = original.replaceFirst("World", "Java");
        System.out.println(replaced);  // 输出: Hello, Java! Welcome to the World of Java.
    }
}

public class StringBuilderReplaceExample {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("Hello, World!");
        sb.replace(7, 12, "Java");
        System.out.println(sb.toString());  // 输出: Hello, Java!
    }
}

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

public class Main {
    public static void main(String[] args) {
        String originalString = "Hello, world!";
        String pattern = "world";
        String replacement = "Java";

        // 使用正则表达式替换字符串
        String resultString = originalString.replaceAll(pattern, replacement);

        System.out.println("原始字符串: " + originalString);
        System.out.println("替换后的字符串: " + resultString);
    }
}