语法错误

[cxxlp]

    public void paint(Graphics g){
        super.paint(g);
        
        g.setColor(Color.RED);
        g.drawString("hello java", x,y);
   
        
    }
    
    public void ac(){
    	
    	
    	paint(Graphics g);
    	
    	
    }

错误提示:Unresolved compilation problem:
Syntax error on token "g", delete this token


不能在ac中这样调用paint方法吗，，，，应该怎么调用?

[junjun1984]

    public static void paint(Graphics g){
        super.paint(g);
        
        g.setColor(Color.RED);
        g.drawString("hello java", x,y);
   
        
    }
    
    public void ac(){
        
        
        paint(Graphics g);
        
        
    }

[zhujiahill]

应该是paint(g)，不用把类型写进去。。。

[saiche05]

public static void paint(Graphics g){
super.paint(g);

g.setColor(Color.RED);
g.drawString("hello java", x,y);


}

public void ac(){


paint(g);


}

[cxxlp]

以上三个写法都不行........我的整个的程序如下

[cxxlp]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class lcd extends JFrame{
    
   
    JPanel p = new JPanel();    
    
    private JButton b1 = new JButton("Setup");
    private JButton b2 = new JButton("Hide");
    
    private Image icon;
   // Thread t1 = new Thread(new t1(this));
    
    private int x=0;
    private int y=40;
    Graphics gg;
    
    public lcd(){
        
    	icon=Toolkit.getDefaultToolkit().getImage("1.gif");
        Container con = this.getContentPane();
        con.setLayout(null);
      
        
        b1.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				b1_button(e);
			}
		});
        b2.addActionListener(new ActionListener(){
        	
        	public void actionPerformed(ActionEvent e){
        		
        		b2_button(e);
        		
        	}
        	
        });
        
      
        
        p.setBackground(Color.BLACK);
        
        p.setBounds(0, 85, 400, 50);
        b1.setBounds(340, 0, 60, 40);
        b1.setBackground(Color.BLACK);
        b1.setForeground(Color.WHITE);
        b1.setBorder(null);
        
        
        
        b2.setBounds(280, 0, 60, 40);
        b2.setBackground(Color.BLACK);
        b2.setForeground(Color.WHITE);
        b2.setBorder(null);
        
        
        
        
        
        p.add(b2);
        
        
        p.setLayout(null);
        
        p.add(b1);
        
        con.add(p);
        
        con.setBackground(Color.WHITE);
        
        
    //   this.setIconImage(icon)

        
    }
    
    public void paint(Graphics g){
        super.paint(g);
        
        g.setColor(Color.RED);
        g.drawString("hello java", x,y);
   
        
    }
    
  public void ac(){
        
        
        paint(Graphics g);
        
        
    }

    
    public void b1_button(ActionEvent e){
    	
    	

    	lcdcomset lc = new lcdcomset();
    	lc.setVisible(true);
    	
    	
    	
    }
    
    
    public void b2_button(ActionEvent e){
    	

    	ac();
    	
    	
    	
    }
    
    public static void main(String args[]){
        
    	
    	
        lcd  lc= new lcd();  
        lc.setSize(400,150);
        int windowWidth = lc.getWidth();                    //获得窗口宽
        int windowHeight = lc.getHeight();                  //获得窗口高
        Toolkit kit = Toolkit.getDefaultToolkit();             //定义工具包
        Dimension screenSize = kit.getScreenSize();            //获取屏幕的尺寸
        int screenWidth = screenSize.width;                    //获取屏幕的宽
        int screenHeight = screenSize.height;                  //获取屏幕的高

        lc.setLocation(screenWidth/2-windowWidth/2, screenHeight/2-windowHeight/2);
    
        
        
        lc.setVisible(true);
        
        
    }
    

}

[以梦为马]

public void ac(){
paint(Graphics g);
}
“paint(Graphics g);”是方法调用而不是方法定义，
正确的写法应该是：
public void ac(){
paint(g);
}

但这样问题来了，
你这里的g并未在外面定义（并不是类的属性）。

[zhujiahill]

paint(Graphics g)java中还有这种写法吗？调用只能paint(g)，而且你在ac()中g的值从哪来？

[cxxlp]

那我现在要怎么写才能在一个方法中调用paint方法

[cxxlp]

好长时间没搞java了，忘记了，不好意思。。。。。直接调用repaint方法..................

[ooo19841080xinxin]

[Quote=引用楼主 cxxlp 的帖子:]
Java codepublicvoidpaint(Graphics g){super.paint(g);

g.setColor(Color.RED);
g.drawString("hello java", x,y);


}publicvoidac(){


paint(Graphics g);


}


错误提示:Unresolved compilation problem:
Syntax error on token "g", delete this token


不能在ac中这样调用paint方法吗，，，，应该怎么调用?

[/Quote]
你那是方法调用
实例化一个Graphics仍进去