Question

所以我有一个继承Arc2D.Float的类：

package Simon;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Arc2D;
import javax.swing.JComponent;

public class SimonLight extends Arc2D.Float implements ActionListener{

    public Color defCol, lightUpCol, color; //Colors
    public enum Orientation {leftU, leftD, rightU, rightD};
    Orientation orient;

    public SimonLight(Color defCol, Color lightUpCol, Orientation orient, int x, int y){
        super.x = x;
        super.y = y;
        super.width = 200;
        super.height = 200;
        super.start = 90;
        super.extent = 90;
        this.defCol = defCol;
        this.color = defCol;
        this.lightUpCol = lightUpCol;
        this.orient = orient;
    }
    public void actionPerformed(ActionEvent e){
        //Does nothing atm
        color = lightUpCol;
    }
    public Color getColor(){
        return color;
    }
}

但是在构造函数中，我试图将弧类型设置为Arc2D.PIE，但超类中没有变量允许我更改它。有谁知道如何设置类型??

Answer 1

您应该考虑使用super构造函数而不是......

public SimonLight(Color defCol, Color lightUpCol, Orientation orient, int x, int y){
    super(x, y, 200, 200, 90, 90, Arc2D.PIE);
    this.defCol = defCol;
    this.color = defCol;
    this.lightUpCol = lightUpCol;
    this.orient = orient;
}

这通常是一种更好的做法，如果超类要求这些值在内部设置自己;）

通过继承绘制Arc2D.Float

1 个答案: