Java设计模式之策略模式定义与用法详解

public class Worker {
  int id;
  String name;
  int age;
}

Worker searchWorker(List<Worker> workers);

import java.util.List;
public interface WorkStrategy {
  public Worker AgeAverage(List<Worker> list);
}

import java.util.List;
public class MaxAge {
  WorkStrategy workstrategy;
  public void SetWorkStrategy(WorkStrategy workstrategy){
    this.workstrategy=workstrategy;
  }
  public Worker getFindMax(List<Worker> list){
    if(workstrategy!=null)
      return workstrategy.AgeAverage(list);
    else{
      return null;
    }
  }
}

import java.util.List;
public class StrategyMaxAge implements WorkStrategy{
  @Override
  public Worker AgeAverage(List<Worker> list) {
    int fs[] = new int[list.size()];
    int maxage = 0;
    for (int j = 0; j < list.size(); j++) {
      fs[j]=list.get(j).getAge();
      if (fs[maxage] <= fs[j]) {
        maxage = j;
      }
    }
    return list.get(maxage);
  }
}

import java.util.ArrayList;
import java.util.List;
public class Application {
  public static void main(String[] args) {
    List<Worker> list = new ArrayList<>();
    list.add(new Worker(1, "张三", 30));
    list.add(new Worker(2, "李四", 40));
    list.add(new Worker(3, "王五", 33));
    MaxAge findage = new MaxAge();
    findage.SetWorkStrategy(new StrategyMaxAge());
    Worker findw = findage.getFindMax(list);
    System.out.println("脚本之家测试结果：");
    System.out.println("年龄最大的工人:"+findw.getId()+" "+findw.getName()+" "+findw.getAge());
  }
}
class Worker{
  int id;
  String name;
  int age;
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age =age;
  }
  public Worker(int id, String name, int age) {
    super();
    this.id = id;
    this.name = name;
    this.age = age;
  }
  public Worker() {
    super();
    // TODO Auto-generated constructor stub
  }
}