关于绘图

黑煤碳 2017-06-21 11:03:37

我写了一段关于绘图的程序

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Paint;



import javax.swing.JFrame;

import javax.swing.JPanel;



public class Huitu extends JFrame {

	Mymb mb=new Mymb();

	public static void main(String[] args) {

		Huitu huitu=new Huitu();

	}

	public Huitu(){

		mb=new Mymb();

		

		this.add(mb);

		this.setTitle("电梯");

		this.setSize(600, 800);

		this.setVisible(true);

		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}

class Mymb extends JPanel{

	private int y=500;

	private int Zhuangtai=0;//0为无，1为上，2为下

	@Override

	public void paint(Graphics g) {

		// TODO Auto-generated method stub

		super.paint(g);

		g.setColor(Color.gray);

		g.fillRect(50, 500, 150, 200);

	}

	public void paintComponent(Graphics g){

		

	}

	public Mymb(){

		repaint();

	}

	public void setY(int y){

		this.y=y;

	}

//	public int getY(){

//		return y;

//	}

//	public int getZhuangtai(){

//		return Zhuangtai;

//	}

}

当我注释掉Mymb类里面的返回类型为int的方法时，程序可以绘出图像

当我不注释代码

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Paint;



import javax.swing.JFrame;

import javax.swing.JPanel;



public class Huitu extends JFrame {

	Mymb mb=new Mymb();

	public static void main(String[] args) {

		Huitu huitu=new Huitu();

	}

	public Huitu(){

		mb=new Mymb();

		

		this.add(mb);

		this.setTitle("电梯");

		this.setSize(600, 800);

		this.setVisible(true);

		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}

class Mymb extends JPanel{

	private int y=500;

	private int Zhuangtai=0;//0为无，1为上，2为下

	@Override

	public void paint(Graphics g) {

		// TODO Auto-generated method stub

		super.paint(g);

		g.setColor(Color.gray);

		g.fillRect(50, 500, 150, 200);

	}

	public void paintComponent(Graphics g){

		

	}

	public Mymb(){

		repaint();

	}

	public void setY(int y){

		this.y=y;

	}

	public int getY(){

		return y;

	}

	public int getZhuangtai(){

		return Zhuangtai;

	}

}