集合筛选
场景
条件过滤，条件组合
代码
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| interface Criteria {
List<NumberData> filter(List<NumberData> list);
}
public class AndCriteria implements Criteria{
private Criteria a;
private Criteria b;
public AndCriteria(Criteria a, Criteria b) {
this.a = a;
this.b = b;
}
@Override
public List<NumberData> filter(List<NumberData> list){
return b.filter(a.filter(list));
}
}
class LessThan5 implements Criteria {
public List<NumberData> filter(List<NumberData> list) {
return list.stream().filter(i -> i.getVal() < 5).collect(Collectors.toList());
}
}
class LargerThan10 implements Criteria {
public List<NumberData> filter(List<NumberData> list) {
return list.stream().filter(i -> i.getVal() > 5).collect(Collectors.toList());
}
}
|
特点
和组合模式思路有点相似，组合后依然实现相同接口，统一建模
