为什么eclipse提示方法mian不能声明为“静态”？ - 黑马程序员技术交流社区

class Ball
{
private int num;
private String color;
{
pop();
}
Ball()
{
System.out.println("num="+num+","+"color="+color);
}
Ball(int num)
{
this.num=num;
System.out.println("num="+num+","+"color="+color);
}
Ball(int num ,String color)
{
this.num=num;
this.color=color;
System.out.println("num="+num+","+"color="+color);
}
public static void pop()
{
System.out.println("我会发出Pop响");
}
public void setNum(int num )
{
this.num=num;
pop();
}
public int getNum()
{
return num;
}
class ballDemo
{
public static void main(String[] args) //为什么eclipse提示方法mian不能声明为“静态”，只能在静态类型或顶级类型中才能声明静态方法
{
Ball b=new Ball();
Ball b1=new Ball(3);
Ball b2=new Ball(3,"伯丁篮球棕色");
b.setNum(5);
System.out.println(b1.getNum());
}
}
}

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