请问这在java编译的过程中属于什么类型的错误？

interface Singer {
    public void sing ();
}

interface Painter {
    public void painter ();
}

class Student implements Singer {
   
    private String name ;
   
    Student (String name) {
        this.name = name ;
    }
   
    public void sing () {
        System.out.println ("Student is singing!");
    }
}

interface Teacher implements Singer,Painter {
    public void sing () {
        System.out.println ("Teacher is singing!");
    }
}

public class PracticeInterface {
    public static void main (String[] args) {
   
    }
}

恩恩，我试试，谢谢

我刚刚试了一下，可是还是报错，麻烦帮我看看

interface Singer {
    public void sing ();
}

interface Painter {
    public void paint ();
}

class Student implements Singer {
   
    private String name ;
   
    Student (String name) {
        this.name = name ;
    }
   
    public void sing () {
        System.out.println ("Student is singing!");
    }
}

interface Teacher implements Singer,Painter {
    public void sing () {
        System.out.println ("Teacher is singing!");
    }
   
    public void paint () {
        System.out.println ("painter");
    }
   
}

public class PracticeInterface {
    public static void main (String[] args) {
        Teacher T = new Teacher ();
        T.sing () ;
    }
}

那么应该如何改？

我知道错误了，把interface teacher 改成 class teacher 就OK了！

interface Singer {
    public void sing ();
}

interface Painter {
    public void paint ();
}

class Student implements Singer {
   
    private String name ;
   
    Student (String name) {
        this.name = name ;
    }
   
    public void sing () {
        System.out.println ("Student is singing!");
    }
}

class Teacher implements Singer,Painter {
    public void sing () {
        System.out.println ("Teacher is singing!");
    }
   
    public void paint () {
        System.out.println ("painter");
    }
   
}

public class PracticeInterface {
    public static void main (String[] args) {
        Teacher T = new Teacher ();
        T.sing () ;
    }
}
这样就好了！