java - java.awt.color.RED 是对象还是属性？

Question

Color.GREEN 看起来像一个属性，而不是一个对象，如果是这样，那么如何将类成员(Color.GREEN)分配给 Color 类型的对象引用？

import java.awt.*;

public class StopLight {

    public static final Color GREEN = Color.GREEN;
    public static final Color YELLOW = Color.YELLOW;
    public static final Color RED = Color.RED;


    public StopLight() {
        state = GREEN;
    }

    private Color state;
}

Answer 1

它是java awt中定义的公共(public)静态对象Color :

/**
 * The color green.  In the default sRGB space.
 */
public final static Color green     = new Color(0, 255, 0);

/**
 * The color green.  In the default sRGB space.
 * @since 1.4
 */
public final static Color GREEN = green;

因此您可以将其访问为Color.GREEN。