package com.cdyfsz.autoaudit.demo;
import com.alibaba.fastjson.JSON;
import com.cdyfsz.autoaudit.dto.AutoApproveEntryOpinionDTO;
import com.cdyfsz.autoaudit.dto.OtherDocInfoDTO;
import org.apache.commons.collections.MapUtils;
import java.sql.SQLOutput;
import java.util.*;
import java.util.stream.Collectors;
public class test1 {
public static void main(String[] strg) {
// test1();
// test2();
// test3();
// test4();
// test5();
test6();
//第一种数组转list
String[] ss ={"杭州:DDSelectField-K43RGPMS","宁波:DDSelectField-K43RGPMT","温州:DDSelectField-K43RGPMU", "合肥:DDSelectField-K43RGPN1","芜湖:TextareaField-K43RGPN2","南京:DDSelectField-K43RGPN3","无锡:DDSelectField-K43RGPN4"};
String sssss = JSON.toJSONString(ss);
long millis =System.currentTimeMillis();
List<String> ls = JSON.parseArray(sssss,String.class);
long m = System.currentTimeMillis() - millis;
System.out.println("共计耗时多少毫秒"+m);
System.err.println(ls );
//第二种数组转list集合
String[] ss1 ={"杭州:DDSelectField-K43RGPMS","宁波:DDSelectField-K43RGPMT","温州:DDSelectField-K43RGPMU", "合肥:DDSelectField-K43RGPN1","芜湖:TextareaField-K43RGPN2","南京:DDSelectField-K43RGPN3","无锡:DDSelectField-K43RGPN4"};
long s2s =System.currentTimeMillis();
List<String> s2 = new ArrayList<>();
for (String s : ss1) {
s2.add(s);
}
long result = System.currentTimeMillis() - s2s;
System.err.println(s2);
System.out.println("共计耗时多少毫秒"+result);
List<String> s3 = new ArrayList<>();
long s2s3 =System.currentTimeMillis();
Arrays.stream(ss1).forEach(l1->{
s3.add(l1);
});
long result1 = System.currentTimeMillis() - s2s3;
System.err.println(s3);
System.out.println("共计耗时多少毫秒"+result1);
}
/**
* 集合转map
*/
public static void test1() {
ArrayList<People> list =new ArrayList<>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
list.add(P1);
list.add(P2);
list.add(P3);
// 用 对象的一个集合结果集，转成map ,以 对象的名字为key ，整个对象为 value 的 转型
Map<String ,People> map=list.stream().collect(Collectors.toMap(People::getName,People -> People));
System.out.println(map);
}
/**
* 遍历
*/
public static void test2(){
ArrayList<People> list =new ArrayList<>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
list.add(P1);
list.add(P2);
list.add(P3);
list.forEach(li -> {
String name = li.getName();
Integer age = li.getAge();
String sex = li.getSex();
System.out.println(name +age + sex );
});
}
/**
* 双重 循环来 判断
*/
public static void test3(){
ArrayList<People> list =new ArrayList<>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
list.add(P1);
list.add(P2);
list.add(P3);
ArrayList<People> list1 =new ArrayList<>();
People P11 =new People("小佛1","男",16);
People P22 =new People("小佛21","男",17);
People P33 =new People("小佛31","男",18);
list1.add(P11);
list1.add(P22);
list1.add(P33);
list.forEach(li1 -> {
list1.forEach( li2 -> {
if (li1.getName().equals(li2.getName())){
System.out.println("就是你了");
return;
}
});
});
for (People pe:list){
String PeName = pe.getName();
for (People pe1:list1){
if (PeName.equals(pe1.getName())){
System.out.println("就是你了1111");
break;
}
}
}
}
/**
* 获取map中第一个key值
*
* @param map 数据源
* @return
*/
private Object getValueOrNull(Map<String, Object> map) {
Object obj = null;
Set<Map.Entry<String, Object>> entries = map.entrySet();
for (Map.Entry<String, Object> entry : entries) {
obj = entry.getValue();
if (obj != null) {
break;
}
}
return obj;
}
/**
* filter
*/
public static void test4(){
ArrayList<People> list111 =new ArrayList<>();
List<People> list =new ArrayList<>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
list.add(P1);
list.add(P2);
list.add(P3);
// 筛选符合条件的数据(留下的是符合条件的数据)
List<People> aa = list.stream().filter(li -> li.getAge()>= 17).collect(Collectors.toList());
System.out.println(aa);
}
public static void test5(){
Map<String,People> map=new HashMap<String,People>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
map.put(P1.getName(),P1);
map.put(P2.getName(),P2);
map.put(P3.getName(),P3);
map.forEach((k,v) ->{
if (k.equals("小佛1")){
System.out.println("111"+v.toString());
}
if (v.getAge()==18){
System.out.println("2222"+v.toString());
}
});
}
public static void test6(){
List<People> ABC=new ArrayList<People>();
People P1 =new People("小佛1","男",16);
People P2 =new People("小佛2","男",17);
People P3 =new People("小佛3","男",18);
ABC.add(P1);
ABC.add(P2);
ABC.add(P3);
// 只获取年龄的数据
List<Integer> bb=ABC.stream().map(People::getAge).collect(Collectors.toList());
Integer[] bb1=ABC.stream().map(People::getAge).toArray(Integer[]::new);
for (Integer b1:bb){
System.out.println("1111+++"+b1);
}
for (int i = 0; i <bb1.length ; i++) {
System.out.println("8888+++++"+bb1[i]);
}
}
}