避免在Java中打印unicode替换字符

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

public class Main {
    public static void main(String[] args) {
        String str = "\\u0000";
        Pattern pattern = Pattern.compile("\\\\u[0-9a-fA-F]{4}");
        Matcher matcher = pattern.matcher(str);
        String result = matcher.replaceAll("");
        System.out.println(result);
    }
}

public class Main {
    public static void main(String[] args) {
        String str = "\\u0000";
        String result = str.replace("\\u0000", "");
        System.out.println(result);
    }
}

public class Main {
    public static void main(String[] args) {
        String str = "\\u0000";
        String result = str.replaceAll("\\\\u[0-9a-fA-F]{4}", "");
        System.out.println(result);
    }
}