Java删除字符replaceFirst

import java.util.Scanner;

public class Demo {

    public static void main(String[] args) {
        Scanner str = new Scanner(System.in);
        String a = null;
        while (true) {
            a = str.next();
            if (a.contains("end")) {
                a = a.substring(0, a.length() - 3);
                break;
            }
        }
        String str2= str.next();
        Object[] objects = deleteSubString(a, str2);
        for (int i = 0; i < objects.length; i++) {
            System.out.println(objects[i]);
        }
        str.close();
    }

    public static Object[] deleteSubString(String str1, String str2) {
        Object[] arr = new Object[2];
        int b = 0;
        while (str1.contains(str2)) {
            str1 = str1.replaceFirst(str2, "");
            b++;
        }
        arr[0] = str1;
        arr[1] = b;
        return arr;
    }
}