关于我的班级以及为什么它没有检测到 java.awt.Color？
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About my class and why it's not detecting java.awt.Color?
提问by allenlistar
I've got a issue with the program I'm writing - this is an APCS A class so there is an APCS.lib - it includes the DrawingTool Class that is used in the program. I'm having issues with the import java.awt.Color statement:
我正在编写的程序有问题——这是一个 APCS A 类，所以有一个 APCS.lib——它包括程序中使用的 DrawingTool 类。我在导入 java.awt.Color 语句时遇到问题：
There is a driver that is executed for the entire program but my question is in the line import java.awt.Color; and line 33 - pencil.SetColor(Color, red); . Not sure my drjava is not detecting that java.awt.color import and still giving me a "cannot find symbol/variable error." The program draws a house.
有一个为整个程序执行的驱动程序，但我的问题是在 import java.awt.Color; 行中。第 33 行 - pen.SetColor(Color, red); . 不确定我的 drjava 没有检测到 java.awt.color 导入并且仍然给我一个“找不到符号/变量错误”。该程序绘制了一个房子。
//Name￡∫ Allen Li
//Date: Monday, September 9th, 2013
//Purpose: Using apcslib to draw a house on with a piece of paper and pencil.
import apcslib.*;
import java.awt.Color;
public class DrawHouse{
private DrawingTool pencil;
private SketchPad paper;
/**
* Basic constructor for DrawHouse.
* Instantiates paper and pencil to basic
* values.
*/
public DrawHouse(){
paper = new SketchPad(300, 400);
pencil = new DrawingTool(paper);
}
/**
* The draw method for the DrawHouse class.
* This method will run all of the
* commands necessary to draw the house.
*
*/
public void draw(){
// draw the main house
pencil.setWidth(3);
pencil.setColor(Color, red);
pencil.down();
pencil.move(-100,0);
pencil.move(-100,100);
pencil.move(100,100);
pencil.move(100,0);
pencil.move(0,0);
//door
pencil.up();
pencil.move(-20,0);
pencil.down();
pencil.move(-20,50);
pencil.move(20,50);
pencil.move(20,0);
//roof
pencil.up();
pencil.move(-100,100);
pencil.down();
pencil.move(0,150);
pencil.move(100,100);
//window left
pencil.up();
pencil.move(-70, 60);
pencil.down();
pencil.move(-40, 60);
pencil.move(-40, 90);
pencil.move(-70, 90);
pencil.move(-70, 60);
//window right
pencil.up();
pencil.move(70,60);
pencil.down();
pencil.move(40,60);
pencil.move(40,90);
pencil.move(70,90);
pencil.move(70,60);
pencil.up();
}
}
采纳答案by Xynariz
To elaborate on the given answers:
详细说明给定的答案：
The setColor method requires a single Colorobject as its parameter. You cannot pass it Color, as that is a class, and you cannot pass it red, as that doesn't mean anything to the compiler (it tries to find a variable named red).
setColor 方法需要一个Color对象作为其参数。你不能传递它Color，因为它是一个类，你不能传递它red，因为这对编译器没有任何意义（它试图找到一个名为 的变量red）。
The trick is to access the static variable Color.redor Color.RED(which is a Colorobject), and pass it into the method, as the other answers have done. As mentioned in another answer, the javadocs for Colormay help you here.
诀窍是访问静态变量Color.redor Color.RED（它是一个Color对象），并将其传递给方法，就像其他答案所做的那样。正如另一个答案中提到的，javadocs forColor可能会在这里帮助你。
回答by Marc Hauptmann
java.awt.Color has a constant red. It should be
java.awt.Color 有一个常量red。它应该是
pencil.setColor(Color.red);
in line 33. Have a look at its the javadoc for Color.
在第 33 行。看看它的javadoc forColor.
回答by JNYRanger
You have a syntax error where you have pencil.setColor(Color, red);
你有一个语法错误，你有 pencil.setColor(Color, red);
This line should be: pencil.setColor(Color.RED);
这一行应该是： pencil.setColor(Color.RED);
By the way welcome to SO!
顺便说一下，欢迎来到 SO！
