e public boolean eva luate(Goods goods) { return goods.isDiscount(); } }; //二选一 Closure
ifClo = IfClosure.ifClosure(pre,discount,subtract); //关联 CollectionUtils.forAllDo(goodsList,ifClo); //查看操作后的数据 for(Goods temp:goodsList) { System.out.println(temp); } } /** * 确保所有的员工工资都大于10000，如果已经超过的不再上涨 。 */ public static void whileClosure() { //数据 List
empList = new ArrayList<>(); empList.add(new Employee("周杰伦",20000)); empList.add(new Employee("范冰冰",30000)); empList.add(new Employee("黄晓明",5000)); //业务功能 每次上涨0.2 Closure
cols = new Closure
() { @Override public void execute(Employee emp) { emp.setSalary(emp.getSalary()*1.2); } }; //判断 Predicate
empPre = new Predicate
() { @Override public boolean eva luate(Employee emp) { return emp.getSalary()<10000; } }; //false 表示while结构先判断后执行 //true 表示do..while先执行后判断 Closure
whileCols = WhileClosure.whileClosure(empPre,cols,false); //工具类 CollectionUtils.forAllDo(empList, whileCols); //操作后的数据 Iterator
empIt = empList.iterator(); while(empIt.hasNext()) { System.out.println(empIt.next()); } } /** *折上减 如果打折商品，先进行9折，如果还满百，再减20 */ public static void chainClousure() { List
goodsList = new ArrayList<>(); goodsList.add(new Goods("
Android视频",120,true)); goodsList.add(new Goods("javaee视频",100,false)); goodsList.add(new Goods("Spack视频",80,false)); //满百减20 Closure
subtract = new Closure
() { @Override public void execute(Goods input) { if(input.getPrice()>=100){ input.setPrice(input.getPrice()-20); } } }; //打折 Closure
discount = new Closure
() { @Override public void execute(Goods input) { if(input.isDiscount()){ input.setPrice(input.getPrice()*0.9); } } }; //链式操作 Closure
chinaClo = ChainedClosure.chainedClosure(discount,subtract); //关联 CollectionUtils.forAllDo(goodsList,chinaClo); //查看操作后的数据 for(Goods temp:goodsList) { System.out.println(temp); } } }
运行结果：
(码农：mark,薪水：24000.0)
(码农：json,薪水：12000.0)
(码农：Ivy,薪水：6000.0)
==================
(商品:android视频，价格：108.0,是否打折：是)
(商品:javaee视频，价格：80.0,是否打折：否)
(商品:hadoop视频，价格：130.0,是否打折：否)
==================
(码农：周杰伦,薪水：20000.0)
(码农：范冰冰,薪水：30000.0)
(码农：黄晓明,薪水：10368.0)
==================
(商品:Android视频，价格：88.0,是否打折：是)
(商品:javaee视频，价格：80.0,是否打折：否)
(商品:Spack视频，价格：80.0,是否打折：否)
四、集合操作
package Collections;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.collections4.CollectionUtils;
/**
* 集合操作
* 1、并集 CollectionUtils.union
* 2、交集 CollectionUtils.intersection
* CollectionUtils.retainAll
* 3、差集
* CollectionUtils.subtract
*/
public class Demo04 {
public static void main(String[] args) {
Set
set1 = new HashSet<>(); set1.add(1); set1.add(2); set1.add(3); Set
set2 = new HashSet<>(); set2.add(2); set2.add(3); set2.add(4); System.out.println("========并集=========="); //并集 Collection
col = CollectionUtils.union(set1, set2); for(Integer temp:col) { System.out.print(temp+" "); } System.out.println("\n=========交集========="); //交集 //col = CollectionUtils.intersection(set1, set2); col = CollectionUtils.retainAll(set1, set2); for(Integer temp:col) { System.out.print(temp+" "); } //差集 System.out.println("\n=========差集========="); col = CollectionUtils.subtract(set1, set2); for(Integer temp:col) { System.out.print(temp+" "); } } }
运行结果：
========并集==========
1 2 3 4
=========交集=========
2 3