报错error: incompatible types: boolean cannot be converted to int

Question

import java.util.Scanner;
class Circle{
    private int radius;
    //为radius添加set方法，接收用户输入的半径，如果用户输入半径为<=0,则让半径的值为2
    public void setter(int radius){
        if(radius<=0){
            radius=2;
        }
        else
            this.radius=radius;
    }
    //无参构造方法 ，给radius赋值为2，并输出信息："This is a constructor with no para."
    public Circle(){
        radius=2;
        System.out.println("This is a constructor with no para.");
    }
        //有参构造方法 ，接收用户给的radius赋值，并输出"This is a constructor with para."（如果给的半径小于等于0,则赋默认值为2）
        public Circle(int radius){
            if(radius<=0){
                radius=2;
            }
            else
                this.radius=radius;
            System.out.println("This is a constructor with para.");
        }
    //为radius半径添加get方法，返回用户输入的半径
    public int getter(){
        return radius;
    }
    //求圆面积方法getArea(), π使用Math.PI代替
    public float getArea(){
        double area;
        area=Math.PI*radius*radius;
        return (float)area;
    }
    //定义toString方法
    public String toString(){
        return "Circle [radius=" + radius + "]";
    }
}
public class Main{
    public static void main(String[] args){
        int radius;
        Circle c1,c2,c3;
        Scanner sc=new Scanner(System.in);
        //定义并创建Circle类对象c1，输出c1对象，求c1的面积并输出
        c1=new Circle();
        System.out.println(c1.toString());
        System.out.println(c1.getArea());
        //定义并创建Circle类对象c2，输出c2对象，求c2的面积并输出；
        c2=new Circle();
        System.out.println(c2.toString());
        System.out.println(c2.getArea());
        //从键盘接收整数半径，赋值给c2的半径，输出c2对象，求c2的面积并输出
        c2=new Circle(sc.hasNextInt());
        System.out.println(c2.toString());
        System.out.println(c2.getArea());
        //从键盘接收整数半径，用有参构造方法创建Circle类对象c3，输出c3对象，求c3的面积后输出
        c3=new Circle(sc.hasNextInt());
        System.out.println(c3.toString());
        System.out.println(c3.getArea());
    }
}
//Main.java:55: error: incompatible types: boolean cannot be converted to int
//        c2=new Circle(sc.hasNextInt());
//                                   ^
//Main.java:59: error: incompatible types: boolean cannot be converted to int
//        c3=new Circle(sc.hasNextInt());
//                                   ^
//Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
//2 errors

Answer 1

c2=new Circle(sc.hasNextInt());
->
c2=new Circle(sc.nextInt());