设计模式_装饰模式

public abstract class SchoolReport {
 public abstract void report();
 public abstract void sign(String name);
}

public class FourthGradeSchoolReport extends SchoolReport {

 @Override
 public void report() {
  System.out.println("尊重的xxx");
  System.out.println("...............");
  System.out.println("语文:60  数学:68  自然:87");
 }

 public void sign(String name) {
  System.out.println("家长签字:"+name);
 }
}

public abstract class Decorator extends SchoolReport {

 private SchoolReport sr;
 
 public Decorator(SchoolReport sr){
  this.sr=sr;
 }
 
 @Override
 public void report() {
  this.sr.report();
 }

 @Override
 public void sign(String name) {
  this.sr.sign(name);
 }
}

public class HighScoreDecorator extends Decorator {

 public HighScoreDecorator(SchoolReport sr) {
  super(sr);
 }
 
 private void reportHighScore(){
  System.out.println("这次考试语文最高70，数学最高70，自然最高100");
 }

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

public class SortDecorator extends Decorator {

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

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

public static void main(String[] args) {
  
  SchoolReport sr;
  sr=new FourthGradeSchoolReport();
  sr=new HighScoreDecorator(sr);
  sr=new SortDecorator(sr);
  sr.report();
  sr.sign("Dad");
  //这样老爸自然就开心的签字了
 }

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