Callback 回调模式

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调用一个方法时，向该方法除了传数据之外，还要向该方法中传一段代码，并且在该方法中调用这段代码（这段代码一般在接口里定义，在匿名类里实现）。

学生筛选系统：

public class Student {private String name;private int age;private double score;public Student(String name, int age, double score) {this.name = name;this.age = age;this.score = score;}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 double getScore() {return score;}public void setScore(double score) {this.score = score;}   public String toString(){   return name;   }}

定义一个学生筛选器：

public interface StudentFilter {    public abstract boolean accept(Student student);}

import java.util.ArrayList;import java.util.List;public class Test {     public static void main(String[] args) {List<Student> list=new ArrayList<Student>();list.add(new Student("xu",45,45.1));list.add(new Student("yu",12,81.0));                //将过滤器传输给selector方法List <Student> listTest=selector(list,new StudentFilter(){@Overridepublic boolean accept(Student student) {if(student.getScore()>80.0){return true;}return false;}});System.out.println(listTest);}     public static List<Student> selector(List<Student> list,StudentFilter filter){     List<Student> listStudent=new ArrayList<Student>();     for(Student stu:list){     if(filter.accept(stu)){     listStudent.add(stu);     }     }     return listStudent;     }}

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