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Accepted
Anton Buketov
Asked:2022-03-28 00:05:03 +0000 UTC2022-03-28 00:05:03 +0000 UTC

接口的问题

  • 772

我不知道问题是什么，它给出了：“返回类型 void 与字符串接口 java 不兼容”，我读了一些关于相同方法签名的东西，但不明白。我该如何解决这个问题或向哪个方向挖掘。

public class Student implements Printable { 


    Student() {
         ...
    }


    public void doing() {
        System.out.printf(" что то делает ");
    }
}

class StudentDetails extends Student implements Printable {

    StudentDetails() {
        super()
         ...
    }

    public void doing(){
        System.out.println("делает что то вдобавок");
    }
}

interface Printable {

    void doing();

}

class Main {

public static void main(String[] arg) {
    Student st1 = new Student();
    Student st2 = new Student();
    Student st3 = new Student();
    Student st4 = new Student();
    Student st5 = new Student();

    Student[] students = new Student[5];
    students[0] = st1;
    students[1] = st2;
    students[2] = st3;
    students[3] = st4;
    students[4] = st5;

    for (int i = 0; i < students.length; i++) {
        System.out.println(students[i].doing());
    }

}

}
java

2 个回答

  1. Best Answer

    System.out.println期望您将字符串作为参数传递，并且该方法doing不返回任何内容，因为它void是 .

    尝试

    for (int i = 0; i < students.length; i++) {
    students[i].doing();
}
    • 3 
  2. for (int i = 0; i < students.length; i++) {
    students[i].doing();
}
    • 1

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