import java.awt.*;
class Test
{
static Frame obj;
Panel p;
Button b1;

void init()
{
obj=new Frame("Hello");
p=new Panel();
Button b1=new Button("Click Me");
p.add(b1);
obj.add(p);
}
public static void main(String []args)
{
obj=Frame("Hello");//cannot resolve symbol method Frame(java.lang.String)

Test testobj=new Test();
Testobj.init();//cannot resolve symbol variable Testobj
obj.setBackground(Color.blue);
obj.setSize(300,200);
obj.setVisible(true);

}
}

嘿嘿，_{obj=Frame("Hello");应该是obj＝new Frame（"Hello");}