为什么这个组合代码不起作用？

Question

我的程序显示错误"无法解析符号'getThePixels'"(在课堂上Main).代码基本上创建了一个Monitor包含Resolution类对象的类.我试图Resolution通过监视器对象访问类方法.以下是代码:

主要:

public class Main {
    Resolution resolution = new Resolution(10);
    Monitor monitor = new Monitor(12,13,14,resolution);
    monitor.getThePixels().pix();
}

监控:

public class Monitor {
    private int height;
    private int width;
    private int length;
    Resolution thePixels;

    public Monitor(int height, int width, int length, Resolution thePixels) {
        this.height = height;
        this.width = width;
        this.length = length;
        this.thePixels = thePixels;
    }

    public int getHeight() {
        return height;
    }

    public int getWidth() {
        return width;
    }

    public int getLength() {
        return length;
    }

    public Resolution getThePixels() {
        return thePixels;
    }
}

解析度:

public class Resolution {
    private int pixels;

    public Resolution(int pixels) {
        this.pixels = pixels;
    }

    public void pix() {
        System.out.println("resolution is" + pixels);
    }
}

Answer 1

你应该写那样的Main类.

public class Main {
    public static void main(String[] args) {
        Resolution resolution = new Resolution(10);
        Monitor monitor = new Monitor(12,13,14,resolution);
        monitor.getThePixels().pix();
    }
}

你不能在类体内的对象上调用方法.