设计模式----装饰者模式（decorator pattern）

SchoolReport.java代码如下：

package com.designPattern.decorator;

public abstract class SchoolReport {

	public abstract void report();
	
	public abstract void sign(String name);
}

FouthGradeSchoolReport.java代码如下：

package com.designPattern.decorator;

public class FouthGradeSchoolReport extends SchoolReport{

	@Override
	public void report() {
        System.out.println("========以下是成绩单原装内容！============");		
        System.out.println("+++++++++++++++++++++++++++++++++++");		
        System.out.println("+++++++++++++++++++++++++++++++++++");		
        System.out.println("+++++++++++++++++++++++++++++++++++");		
        System.out.println("+++++++++++++++++++++++++++++++++++");		
        System.out.println("+++++++++++++++++++++++++++++++++++");		
        System.out.println("========以上是成绩单原装内容！============");		
	}

	@Override
	public void sign(String name) {
		System.out.println("家长签名为：" +name);
		
	}

}

Decorator.java代码如下：

package com.designPattern.decorator;

public abstract class Decorator extends SchoolReport{

	private SchoolReport schoolReport;
	
	public Decorator(SchoolReport schoolReport){
		this.schoolReport =schoolReport;
	}
	
	public void report(){
		this.schoolReport.report();
	}
	
	public void sign(String name){
		this.schoolReport.sign(name);
	}
}

HighScoreDecorator.java代码如下：

package com.designPattern.decorator;

public class HighScoreDecorator extends Decorator{

	public HighScoreDecorator(SchoolReport schoolReport) {
		
		super(schoolReport);
	}

	public void reportHighScore(){
		System.out.println("这次语文成绩最高是75，数学是78,自然是80");
	}
	
	public void report(){
		this.reportHighScore();
		super.report();
	}
}

SortDecorator.java代码如下：

package com.designPattern.decorator;

public class SortDecorator extends Decorator{

	public SortDecorator(SchoolReport schoolReport) {
		
		super(schoolReport);
	}
	
	private void reportSort(){
		System.out.println("我排名第38名");
	}

	@Override
	public void report() {
		super.report();
		this.reportSort();
	}

}

Father.java代码如下：

package com.designPattern.decorator;

public class Father {
	
	public static void main(String[] args) {
		
		SchoolReport schoolReport;
		
		schoolReport = new FouthGradeSchoolReport();
		
		schoolReport = new HighScoreDecorator(schoolReport);
		
		schoolReport = new SortDecorator(schoolReport);
		
		schoolReport.report();
		
		schoolReport.sign("one'father");
	}

}

运行结果如下：

这次语文成绩最高是75，数学是78,自然是80
========以下是成绩单原装内容！============
+++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++
========以上是成绩单原装内容！============
我排名第38名
家长签名为：one'father