//利用awt.Graphics畫圖

//Graph用于顯示所要畫的圖型

//Shape的子類定義可以圖形

//要改變圖形，可以利用Graphics類提供的方法實現

//要在同一窗口顯示更多圖形，通過重載paint()實現。

java" style="padding: 0.3em; font-family: Monaco, Menlo, Consolas, 'Courier New', monospace; color: rgb(51, 51, 51); border-radius: 4px; margin-top: 0px; margin-bottom: 1.5em; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre-wrap; border: 1px solid rgba(0, 0, 0, 0.14902); overflow-y: auto; background-color: rgb(246, 246, 246);">

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Graph extends JPanel {

/**

*

*/

private static final long serialVersionUID = 1L;

private Shape shape;

public Graph(Shape shp) {

super();

this.shape = shp;

}

@Override

public void paint(Graphics g) {

super.paint(g);

shape.draw(g);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

JFrame frame = new JFrame();

frame.setTitle("Shape");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Rect rect = new Rect(10,10,100,100);

Graph grp = new Graph(rect);

frame.add(grp);

frame.setLocationRelativeTo(null);

frame.setSize(600,400);

frame.setVisible(true);

}

}

abstract class Shape{

public abstract void draw(Graphics g);

}

class Rect extends Shape{

private int x,y,sizeX,sizeY;

public Rect(int x,int y,int sizeX,int sizeY){

this.x = x;

this.y = y;

this.sizeX = sizeX;

this.sizeY = sizeY;

}

public void draw(Graphics g){

g.drawRect(x,y,sizeX,sizeY);

}

}

class Line extends Shape{

private int x,y,sizeX,sizeY;

public Line(int x,int y,int sizeX,int sizeY){

this.x = x;

this.y = y;

this.sizeX = sizeX;

this.sizeY = sizeY;

}

public void draw(Graphics g){

g.drawLine(x,y,sizeX,sizeY);

}

}

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