質問編集履歴
1
TN8001さんの修正内容で変更したところ次のようなエラーが出ました。TN8001さんのコードでも同じエラーが出ました。
test
CHANGED
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File without changes
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test
CHANGED
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@@ -14,51 +14,73 @@
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14
14
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### 発生している問題・エラーメッセージ
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```
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エラーメッセージ
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```Syntax error, insert "}" to complete MethodBody
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Syntax error on token ".", @ expected after this token
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Syntax error, insert "SimpleName" to complete QualifiedName
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Syntax error, insert "Identifier (" to complete MethodHeaderName
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Exception in thread "main" java.lang.NoSuchMethodError: 'void DrawCanvas.<init>(int)'
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-
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at Test2.main(Test1.java:29)
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-
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```
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### 該当のソースコード
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該当の言語
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Java
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```Java
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31
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import javax.swing.
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import javax.swing.*;
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32
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import javax.swing.JPanel;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.util.Scanner;
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public class Test
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public class Test1 {
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public static void main(String[] args){
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Scanner stdIn = new Scanner(System.in);
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int n;
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while (true) {
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System.out.println("正何角形？(3-999):");
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try {
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n = stdIn.nextInt();
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if (3 <= n && n <= 999) break;
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} catch (Exception ignored) { stdIn.next(); }
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}
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double a = n;
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double b = 180/a;
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double m = Math.toRadians(b);
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double l = a*(Math.sin(m));
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System.out.println("正"+n+"角形の円周率の近似:"+l);
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-
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GameWindow gw = new GameWindow("円と正多角形",1000,1000);
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gw.add(new DrawCanvas());
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gw.add(new DrawCanvas(n));
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gw.setVisible(true);
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}
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}
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class DrawCanvas extends JPanel{
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private int n;
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public DrawCanvas(int n) {
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this.n = n;
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SpinnerNumberModel model = new SpinnerNumberModel(n, 3,999, 1);
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-
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JSpinner spinner = new JSpinner(model);
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spinner.addChangeListener(e -> {
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this.n = (int) spinner.getValue();
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repaint();
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});
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add(spinner);
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-
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}
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public void paintComponent(Graphics g) {
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@Override public void paintComponent(Graphics g) {
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super.paintComponent(g);
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int x0 = 500;
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int y0 = 500;
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int r = 400;
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int x[] = new int[n];
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int y[] = new int[n];
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double delta =
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double delta = 2 * ( Math.PI /(double)n );
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for(int i= 0; i<n; i++) {
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x[i] = (int)(Math.cos(-Math.PI/2.0 + delta * i)*r) + x0;
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@@ -68,14 +90,11 @@
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g.drawPolygon(x, y, n);
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}
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}
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public void paint(Graphics g) {
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public void paint(Graphics g) {
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super.paint(g);
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g.setColor(Color.blue);
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g.setColor(Color.blue);
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g.drawOval(100, 100, 800, 800);
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g.drawOval(100, 100, 800, 800);
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}
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-
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}
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class GameWindow extends JFrame{
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@@ -88,5 +107,8 @@
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}
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}
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```
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+
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+
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91
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