int无法解除引用

问题描述

我从java开始（我正在学习microedition）并且我得到了这个错误：int无法解除引用在下面的类中：

I am beginning in java (I'm learning in microedition) and I got this error: "int cannot be dereferenced" in the following class:

class DCanvas extends Canvas{
    public DCanvas(){

    }

    public void drawString(String str, int x, int y, int r, int g, int b){
        g.setColor(r, g, b); //The error is here
        g.drawString(str, x, y, 0); //and here
    }

    public void paint(Graphics g){
        g.setColor(100, 100, 220);
        g.fillRect(0, 0, getWidth(), getHeight());
    }
}

我在这里做错了什么？
我来自PHP和ECMAScripts，我能够以这种方式传递我的函数参数，所以我真的不明白这个错误。

What am I doing wrong here?Well I came from PHP and ECMAScripts where I was able to pass my function arguments this way so I really don't understand this error.

推荐答案

g drawString 是您传入的颜色值，而不是您的图形参考。因此，错误是当您尝试在 int 上调用方法时，您无法做到这一点。

The g in drawString is the color value you've passed in, not your Graphics reference. So the error is when you're trying to call a method on an int, which you can't do.

//            Passing an integer 'g' into the function here |
//                                                          V
public void drawString(String str, int x, int y, int r, int g, int b){
//  | This 'g' is the integer you passed in
//  V
    g.setColor(r, g, b);
    g.drawString(str, x, y, 0);
}

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