初始化对象时构造函数如何工作？

此代码的输出为 7 20。

为什么7首先打印，20之后打印？

public class Television 
{
    private int channel = setChannel(7);
    public Television(int channel) 
    {
        this.channel = channel;
        System.out.print(channel +"");
    }

    public int setChannel(int channel) 
    {
        this.channel = channel;
        System.out.print(channel + "");
        return channel;
    }

    public static void main(String args[])
    {
        new Television(20);
    }
}