我遇到的主要问题是覆盖toString()以及到底要放什么。如果有人可以提供帮助那就太好了!
// Circle inherits from GeometricObject and uses Drawable
public class Circle extends GeometricObject {
private double radius;
/**Default constructor*/
public Circle() {
this(1.0);
}
/**Overloaded constructor - construct a circle with a specified radius*/
public Circle(double radius) {
//call the local overloaded constructor and pass it the following: radius, "white", false
this.radius = radius;
}
/**Overloaded constructor - construct a circle with specified radius, filled, and color*/
public Circle(double radius, String color, boolean filled) {
//call the GeometricObject's constructor and pass it color and filled
this.radius = radius;
setColor(color);
setFilled(filled);
}
/**Return radius*/
public double getRadius() {
return radius;
}
/**Set a new radius*/
public void setRadius(double radius) {
this.radius = radius;
}
/**Implement the getArea method defined in GeometricObject*/
public double getArea() {
return radius*radius*Math.PI;
}
/**Implement the getPerimeter method defined in GeometricObject*/
public double getPerimeter() {
return 2*radius*Math.PI;
}
/**Override the equals() method defined in the Object class*/
public boolean equals(Circle circle) {
return this.radius == circle.getRadius();
}
这是我的代码遇到的主要问题。我需要有关 toString() 方法如何工作以及要输入什么内容的帮助!
/**Override the toString() method defined in the Object class*/
//output for circle should be: "[Circle] radius = ; color = ; filled = " : insert appropriate variables to the right of the equal sign
@Override
public String toString() {
return [Circle]
}
@Override
public String Draw() {
}
@Override
public String howToDraw() {
}
}
最佳答案
难点在哪里？
return "[Circle] radius: "+this.radius+" ; color = "+this.color+";";
如果颜色是私有(private)的(在父类(super class)中)，你应该使用这样的东西:
return "[Circle] radius: "+this.radius+" ; color = "+getColor()+";";
关于java - 覆盖 toString 时遇到问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37094337/