Java : constructor error "method 'void <init>()' not found"-CodePudding

In main method, I create a new object with a non-argument constructor. But I have runtime error on this line.

Could you please explain why?

class Student {
    String name;
    int age;

    Student() {
        Student();
    }

    void Student() {
        Student("James", 25);
    }

    void Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

public class Test_03_09 {
    public static void main(String[] args) {
        Student s = new Student(); // Runtime error
        System.out.println(s.name   ":"   s.age); 
    }
}

CodePudding user response：

As there are so many bad answers:

It boils down to simply use correct syntax for the Student class constructors:

class Student {
    String name;
    int age;

    Student() {
      this("James", 25);
    }

    Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

Note: the "runtime error" is most likely an artefact of the whole code NOT compiling, and your IDE doing the wrong thing.

CodePudding user response：

Constructors don't have return values, not even void. You've created methods, not constructors.