質問編集履歴
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Circle
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###前提・実現したいこと
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メソッドscaleを利用して，内部でCircleのスケールを呼び出し，内側の円と，外側の円のratio倍の円を作り，それらを用いて，新しいドーナツ型を作成して返したい．
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###発生している問題・エラーメッセージ
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Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - bad operand types for binary operator '*'
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first type: double
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second type: Donut
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###該当のソースコード
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public class Donut {
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Circle inner;
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Circle outer;
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Donut(Circle inner, Circle outer) {
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this.inner = inner;
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this.outer = outer;
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}
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double getArea() {
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return this.outer.getArea() - this.inner.getArea();
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}
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Donut scale(double ratio) {
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this.inner.scale(ratio);
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this.outer.scale(ratio);
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.............................................. .
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}
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}
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public class Circle {
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double r;
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Circle(double r) {
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this.r = r;
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}
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double getArea() {
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return this.r * this.r * Math.PI;
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}
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Circle scale(double ratio) {
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this.r *= ratio;
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return new Circle(this.r * this.r * Math.PI);
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}
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boolean isIdetical(Circle circle2) {
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return this.r == circle2.r;
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}
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}
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###補足情報(言語/FW/ツール等のバージョンなど)
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開発環境 Netbeans 8.1
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Circleクラスを追加しました
title
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File without changes
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@@ -32,6 +32,31 @@
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public class Circle {
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double r;
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Circle(double r) {
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this.r = r;
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}
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double getArea() {
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return this.r * this.r * Math.PI;
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}
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Circle scale(double ratio) {
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this.r *= ratio;
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return new Circle(this.r * this.r * Math.PI);
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}
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boolean isIdetical(Circle circle2) {
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return this.r == circle2.r;
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}
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}
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###補足情報(言語/FW/ツール等のバージョンなど)
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開発環境 Netbeans 8.1
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