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package com.wensefu.constructor;
class Meal{
Meal(){
System.out.println("Meal()");
}
}
class Bread{
Bread(){
System.out.println("bread()");
}
}
class Chesse{
Chesse(){
System.out.println("Chesse()");
}
}
class Lettuce{
Lettuce(){
System.out.println("Lettuce()");
}
}
class Lunch extends Meal{
Lunch(){
System.out.println("Lunch()");
}
}
class PortableLunch extends Lunch{
PortableLunch(){
System.out.println("PortableLunch()");
}
}
/*
* 1,µ÷ÓûùÀ๹ÔìÆ÷£¬´Ë¹ý³Ì»á·´¸´µÝ¹éÏÂÈ¥
* 2£¬°´ÕÕÉùÃ÷˳Ðòµ÷ÓóÉÔ±µÄ³õʼ»¯·½·¨
* 3£¬µ÷Óõ¼³öÀ๹ÔìÆ÷µÄÖ÷Ìå
*/
public class Demo extends PortableLunch{

private Bread b=new Bread();
private Chesse c=new Chesse();
private Lettuce l=new Lettuce();

public Demo() {
// TODO Auto-generated constructor stub
System.out.println("Demo()");
}
public static void main(String[] args) {
new Demo();
}

}

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Meal()
Lunch()
PortableLunch()
bread()
Chesse()
Lettuce()
Demo()
package com.wensefu.duotai;
abstract class Glyph{
abstract void draw();
Glyph(){
System.out.println("Glyph() before draw()");
draw();
System.out.println("Glyph() after draw()");
}
}
class RoundGlyph extends Glyph{
private int radius=1;
RoundGlyph(int r){
radius=r;
System.out.println("RoundGlyph.RoundGlyph(), radius="+radius);
}
@Override
void draw() {
// TODO Auto-generated method stub
System.out.println("RoundGlyph.draw(),radius="+radius);
}
}
/*
* ³õʼ»¯Êµ¼Ê¹ý³Ì£º
* 1£¬ÔÚÆäËûÈκÎÊÂÎï·¢Éú֮ǰ£¬½«·ÖÅ䏸¶ÔÏó´æ´¢¿Õ¼ä³õʼ»¯³É¶þ½øÖƵÄÁã
* 2£¬µ÷ÓûùÀ๹ÔìÆ÷£¬´Ëʱ£¬µ÷Óñ»¸²¸ÇºóµÄdraw()·½·¨£¬£¨ÔÚµ÷ÓÃRoundGlyph¹¹ÔìÆ÷֮ǰµ÷Óã©£¬
* 3£¬°´ÕÕÉùÃ÷µÄ˳Ðòµ÷ÓóÉÔ±µÄ³õʼ»¯·½·¨
* 4£¬µ÷Óõ¼³öÀàµÄ¹¹Ôì·½·¨
*/
public class PolyConstructors {

public static void main(String[] args) {
new RoundGlyph(6);
}
}

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http://download.csdn.net/source/2283940
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