Question

java定义Circle类，radius:double toString():返回radius 些测试在main中，实例化Circle类，输出对象信息

Answer 1

public class Test {
public static void main(String[] args) {
Circle circle=new Circle();
circle.setRadius(5.55);
System.out.println( circle.toString());
}
}
class Circle{
private double radius;

@Override
public String toString() {
return "Circle{" +
"radius=" + radius +
'}';
}

public double getRadius() {
return radius;
}

public void setRadius(double radius) {
this.radius = radius;
}
}