編集履歴

質問編集履歴

コードの変更

2020/07/18 16:16

投稿

ppppapddp

スコア1

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -434,212 +434,160 @@
+}
+```
+```
+//BallPropagator.java
+public class BallPropagator_19rd158{
+    public static double dt;
-    public static void main(String[] args) {
+    public static int xmin;
-        BallPropagator.dt=0.1;
-        JFrame frame = new JFrame();
-        BallMain panel = new BallMain(500,400);panel.setBackground(Color.white);panel.setPreferredSize(new Dimension(panel.xPanelSize, panel.yPanelSize));
-        BallPropagator.xmin = 0;
+    public static int xmax;
-        BallPropagator.xmax = panel.xPanelSize;
-        BallPropagator.ymin = 0;
+    public static int ymin;
+    public static int ymax;
+    private double r;
+    private double x, y;
+    private double vx, vy;
+    private double ax, ay;
+    double p=0.8;
+    BallPropagator(double r,double x,double y,double vx,double vy,double ax,double ay){
+        this.r=r;
+        this.x=x;
+        this.y=y;
+        this.vx=vx;
+        this.vy=vy;
+        this.ax=ax;
+        this.ay=ay;
+    }
+    public void xUpdate() {
-        BallPropagator.ymax = panel.yPanelSize;
+        this.x = this.x + this.vx * dt;
-        frame.pack();
-//
-        frame.setTitle("反射するボール");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setResizable(true);
-        frame.setVisible(true);
-        Timer timer = new Timer(10, panel);
+        if(this.x < (double)xmin+this.r ){
-        timer.start();
+            this.vx *= -p;
+            this.x = (double)xmin+this.r;
+        }else if((double)xmax-this.r < x ){
+            this.vx *= -p;
+            this.x = (double)xmax-this.r;
-    }
+        }
+    }
+    public void yUpdate() {
+        this.y = this.y + this.vy * dt;
+        if(this.y < (double)ymin + this.r ){
+            this.vy *= -p;
+            this.y = (double)ymin+this.r;
+        }else if((double)ymax-this.r < this.y ){
+            this.vy *= -p;
+            this.y = (double)ymax-this.r;
+        }
+    }
+    public void vxUpdate(){
+        this.vx=this.ax*dt+this.vx;
+    }
+    public void vyUpdate(){
+        this.vy=this.ay*dt+this.vy;
 }
+    public double a(double x){
+       return x=this.x;
+}
+     public double b(double x){
+           return x=this.y;
+    } public double c(double x){
+           return x=this.r;
+    }
+}
 ```
-```
-//BallPropagator.java
-public class BallPropagator_19rd158{
-    public static double dt;
-    public static int xmin;
-    public static int xmax;
-    public static int ymin;
-    public static int ymax;
-    private double r;
-    private double x, y;
-    private double vx, vy;
-    private double ax, ay;
-    double p=0.8;
-    BallPropagator(double r,double x,double y,double vx,double vy,double ax,double ay){
-        this.r=r;
-        this.x=x;
-        this.y=y;
-        this.vx=vx;
-        this.vy=vy;
-        this.ax=ax;
-        this.ay=ay;
-    }
-    public void xUpdate() {
-        this.x = this.x + this.vx * dt;
-        if(this.x < (double)xmin+this.r ){
-            this.vx *= -p;
-            this.x = (double)xmin+this.r;
-        }else if((double)xmax-this.r < x ){
-            this.vx *= -p;
-            this.x = (double)xmax-this.r;
-        }
-    }
-    public void yUpdate() {
-        this.y = this.y + this.vy * dt;
-        if(this.y < (double)ymin + this.r ){
-            this.vy *= -p;
-            this.y = (double)ymin+this.r;
-        }else if((double)ymax-this.r < this.y ){
-            this.vy *= -p;
-            this.y = (double)ymax-this.r;
-        }
-    }
-    public void vxUpdate(){
-        this.vx=this.ax*dt+this.vx;
-    }
-    public void vyUpdate(){
-        this.vy=this.ay*dt+this.vy;
-}
-    public double a(double x){
-       return x=this.x;
-}
-     public double b(double x){
-           return x=this.y;
-    } public double c(double x){
-           return x=this.r;
-    }
-}
-```

情報の追加

2020/07/18 16:16

投稿

ppppapddp

スコア1

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -6,6 +6,10 @@
 現在、自学でjavaをやっています。今回、最終的にボタンを押すとボールがその方向に加速するというプログラムを作ろうと思っています。ですが途中でボタンを押しても反応しなくなりました。なぜなのかわからないので教えていただきたいです
+Sample.javaでコンパイルするとボタンが反応しないです
 ■■な機能を実装中に以下のエラーメッセージが発生しました。

付属のソースコードを追加しました

2020/07/18 16:07

投稿

ppppapddp

スコア1

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -24,6 +24,8 @@
 ```
+//Sample.java
 import java.awt.*;
 import java.awt.event.*;
@@ -44,9 +46,9 @@
     double x,y,r,vx,vy,ax,ay;
-    BallPropagator_19rd158 b1;
+    BallPropagator b1;
-    BallPropagator_19rd158 b2;
+    BallPropagator b2;
     Color c1;
@@ -60,7 +62,7 @@
        static JButton btn4 = new JButton("←");
-    Sample19rd158(int xPanelSize, int yPanelSize){
+    Sample(int xPanelSize, int yPanelSize){
@@ -72,9 +74,9 @@
-        b1 = new BallPropagator_19rd158(10, 100, 100, 30, 40, 0, 9.8);
+        b1 = new BallPropagator(10, 100, 100, 30, 40, 0, 9.8);
-        b2 = new BallPropagator_19rd158(10, 10, 100, 50, 20, 0, 9.8);        /////////////////////////////////////////////
+        b2 = new BallPropagator(10, 10, 100, 50, 20, 0, 9.8);        /////////////////////////////////////////////
         c1=Color.black;
@@ -228,7 +230,7 @@
-        BallPropagator_19rd158.dt=0.1;
+        BallPropagator.dt=0.1;
@@ -240,7 +242,7 @@
-        BallMain_19rd158 panel = new BallMain_19rd158(500,400);
+        BallMain panel = new BallMain(500,400);
@@ -258,13 +260,13 @@
-        BallPropagator_19rd158.xmin = 0;
+        BallPropagator.xmin = 0;
-        BallPropagator_19rd158.xmax = panel.xPanelSize;
+        BallPropagator.xmax = panel.xPanelSize;
-        BallPropagator_19rd158.ymin = 0;
+        BallPropagator.ymin = 0;
-        BallPropagator_19rd158.ymax = panel.yPanelSize;
+        BallPropagator.ymax = panel.yPanelSize;
@@ -302,7 +304,7 @@
 ```
+//BallMain.java
 import java.awt.*;
@@ -312,7 +314,7 @@
-public class BallMain_19rd158 extends JPanel implements ActionListener{
+public class BallMain extends JPanel implements ActionListener{
@@ -324,15 +326,15 @@
     double x,y,r,vx,vy,ax,ay;
-    BallPropagator_19rd158 b1;
+    BallPropagator  b1;
-    BallPropagator_19rd158 b2;
+    BallPropagator b2;
     Color c1;
     Color c2;
-    BallMain_19rd158(int xPanelSize, int yPanelSize){
+    BallMain (int xPanelSize, int yPanelSize){
@@ -344,9 +346,9 @@
-        b1 = new BallPropagator_19rd158(10, 100, 100, 30, 40, 0, 9.8);
+        b1 = new BallPropagator (10, 100, 100, 30, 40, 0, 9.8);
-        b2 = new BallPropagator_19rd158(10, 10, 100, 50, 20, 0, 9.8);
+        b2 = new BallPropagator (10, 10, 100, 50, 20, 0, 9.8);
         c1=Color.black;
@@ -434,7 +436,7 @@
-        BallPropagator_19rd158.dt=0.1;
+        BallPropagator.dt=0.1;
@@ -446,19 +448,19 @@
-        BallMain_19rd158 panel = new BallMain_19rd158(500,400);panel.setBackground(Color.white);panel.setPreferredSize(new Dimension(panel.xPanelSize, panel.yPanelSize));
+        BallMain panel = new BallMain(500,400);panel.setBackground(Color.white);panel.setPreferredSize(new Dimension(panel.xPanelSize, panel.yPanelSize));
-        BallPropagator_19rd158.xmin = 0;
+        BallPropagator.xmin = 0;
-        BallPropagator_19rd158.xmax = panel.xPanelSize;
+        BallPropagator.xmax = panel.xPanelSize;
-        BallPropagator_19rd158.ymin = 0;
+        BallPropagator.ymin = 0;
-        BallPropagator_19rd158.ymax = panel.yPanelSize;
+        BallPropagator.ymax = panel.yPanelSize;
@@ -488,6 +490,8 @@
 ```
+//BallPropagator.java
 public class BallPropagator_19rd158{
@@ -520,7 +524,7 @@
-    BallPropagator_19rd158(double r,double x,double y,double vx,double vy,double ax,double ay){
+    BallPropagator(double r,double x,double y,double vx,double vy,double ax,double ay){
         this.r=r;
@@ -548,7 +552,7 @@
         if(this.x < (double)xmin+this.r ){
-            // this.vx = ??????????
             this.vx *= -p;
@@ -556,7 +560,7 @@
         }else if((double)xmax-this.r < x ){
-            // this.vx = ??????????
             this.vx *= -p;

付属のソースコードを追加しました

2020/07/18 16:04

投稿

ppppapddp

スコア1

test CHANGED Viewed

File without changes

test CHANGED Viewed

@@ -22,7 +22,7 @@
 ソースコード
+```
 import java.awt.*;
@@ -292,30 +292,346 @@
         timer.start();
     }
 }
-### 試したこと
-ここに問題に対して試したことを記載してください。
-### 補足情報（FW/ツールのバージョンなど）
-ここにより詳細な情報を記載してください。
+```
+```
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+public class BallMain_19rd158 extends JPanel implements ActionListener{
+   static int xPanelSize;
+    static int yPanelSize;
+    double x,y,r,vx,vy,ax,ay;
+    BallPropagator_19rd158 b1;
+    BallPropagator_19rd158 b2;
+    Color c1;
+    Color c2;
+    BallMain_19rd158(int xPanelSize, int yPanelSize){
+        this.xPanelSize = xPanelSize;
+        this.yPanelSize = yPanelSize;
+        b1 = new BallPropagator_19rd158(10, 100, 100, 30, 40, 0, 9.8);
+        b2 = new BallPropagator_19rd158(10, 10, 100, 50, 20, 0, 9.8);
+        c1=Color.black;
+        c2=Color.blue;
+    }
+    public void actionPerformed(ActionEvent e){
+        b1.xUpdate();
+        b1.yUpdate();
+        b1.vxUpdate();
+        b1.vyUpdate();
+        b2.xUpdate();
+        b2.yUpdate();
+        b2.vxUpdate();
+        b2.vyUpdate();
+        repaint();
+    }
+    public void paintComponent(Graphics g){
+        super.paintComponent(g);
+        g.setColor(c1);
+        g.fillOval((int)(b1.a(x) - b1.c(r)), (int)(b1.b(y) - b1.c(r)),
+                   (int)(2*b1.c(r)), (int)(2*b1.c(r)));
+        g.setColor(c2);
+        g.fillOval((int)(b2.a(x) - b2.c(r)), (int)(b2.b(y) - b2.c(r)),
+                   (int)(2*b2.c(r)), (int)(2*b2.c(r)));
+    }
+    public static void main(String[] args) {
+        BallPropagator_19rd158.dt=0.1;
+        JFrame frame = new JFrame();
+        BallMain_19rd158 panel = new BallMain_19rd158(500,400);panel.setBackground(Color.white);panel.setPreferredSize(new Dimension(panel.xPanelSize, panel.yPanelSize));
+        BallPropagator_19rd158.xmin = 0;
+        BallPropagator_19rd158.xmax = panel.xPanelSize;
+        BallPropagator_19rd158.ymin = 0;
+        BallPropagator_19rd158.ymax = panel.yPanelSize;
+        frame.pack();
+//
+        frame.setTitle("反射するボール");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setResizable(true);
+        frame.setVisible(true);
+        Timer timer = new Timer(10, panel);
+        timer.start();
+    }
+}
+```
+```
+public class BallPropagator_19rd158{
+    public static double dt;
+    public static int xmin;
+    public static int xmax;
+    public static int ymin;
+    public static int ymax;
+    private double r;
+    private double x, y;
+    private double vx, vy;
+    private double ax, ay;
+    double p=0.8;
+    BallPropagator_19rd158(double r,double x,double y,double vx,double vy,double ax,double ay){
+        this.r=r;
+        this.x=x;
+        this.y=y;
+        this.vx=vx;
+        this.vy=vy;
+        this.ax=ax;
+        this.ay=ay;
+    }
+    public void xUpdate() {
+        this.x = this.x + this.vx * dt;
+        if(this.x < (double)xmin+this.r ){
+            // this.vx = ??????????
+            this.vx *= -p;
+            this.x = (double)xmin+this.r;
+        }else if((double)xmax-this.r < x ){
+            // this.vx = ??????????
+            this.vx *= -p;
+            this.x = (double)xmax-this.r;
+        }
+    }
+    public void yUpdate() {
+        this.y = this.y + this.vy * dt;
+        if(this.y < (double)ymin + this.r ){
+            this.vy *= -p;
+            this.y = (double)ymin+this.r;
+        }else if((double)ymax-this.r < this.y ){
+            this.vy *= -p;
+            this.y = (double)ymax-this.r;
+        }
+    }
+    public void vxUpdate(){
+        this.vx=this.ax*dt+this.vx;
+    }
+    public void vyUpdate(){
+        this.vy=this.ay*dt+this.vy;
+}
+    public double a(double x){
+       return x=this.x;
+}
+     public double b(double x){
+           return x=this.y;
+    } public double c(double x){
+           return x=this.r;
+    }
+}
+```