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yongjie.zhang@ucarinc.com
committed
11.13
1 parent f1fa8de commit 8db9667

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8 files changed

+230
-2
lines changed

8 files changed

+230
-2
lines changed

‎java-stream/src/com/asher/function/annotation/MyAnnotation.java

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package com.asher.function.annotation;
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import java.lang.annotation.*;
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/**
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* 重复注解
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*
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*/
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@Repeatable(MyAnnotations.class)
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@Target(ElementType.TYPE)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface MyAnnotation {
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String value()default "zhangyongjie";
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}

‎java-stream/src/com/asher/function/annotation/MyAnnotations.java

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package com.asher.function.annotation;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target(ElementType.TYPE)
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@Retention(RetentionPolicy.RUNTIME)
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public @interface MyAnnotations {
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MyAnnotation[] value();
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}

‎java-stream/src/com/asher/function/annotation/TestRepeatAnnotation.java

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package com.asher.function.annotation;
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/**
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* @author : 张勇杰
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* @date : 2019/10/19 15:51
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* @Version : v1.0
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* @description
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**/
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public class TestRepeatAnnotation {
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public static void main(String[] args) {
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}
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}

‎java-stream/src/com/asher/function/stream/StreamApiTest.java

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* 3.终止操作（终端操作）
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**/
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public class StreamApiTest {
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static class A{
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}
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static class B extends A{
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}
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static class C extends B{
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}
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public static void main(String[] args) {
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test1();
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}
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public static void test1(){
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//1.可以通过Collection系列集合提供的stream()
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List<String> list = new ArrayList<>();
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Stream<String> stream = list.stream();
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//2.通过Arrays中的静态方法stream获取数组流

‎java-stream/src/com/asher/function/stream/StreamApiTest2.java

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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Comparator;
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import java.util.List;
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import java.util.stream.Stream;
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public static void test7(){
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List<String> list = Arrays.asList("aaa","bbb","ccc","ddd","eee");
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list.stream().map(x -> x.toUpperCase()).forEach(System.out::println);
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users.stream().map(User::getName).forEach(System.out::println);
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System.out.println("--------------------------------------------");
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users.stream().sorted((e1,e2) ->{
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return e1.getAge().compareTo(e2.getAge());
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}
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}).forEach(System.out::println);
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}
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static Stream<Character> filterChracter(String str){

‎java-stream/src/com/asher/function/stream/Test1.java

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package com.asher.function.stream;
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/**
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* @author : 张勇杰
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* @date : 2019/10/30 18:13
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* @Version : v1.0
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* @description
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**/
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public class Test1 implements Cloneable{
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public static void main(String[] args) throws CloneNotSupportedException {
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Test1 t = new Test1();
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Object clone = t.clone();
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System.out.println(t);
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System.out.println(clone);
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}
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void method1(Test<? extends Fu> test){
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// test.setT(new Fu1());
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Fu t = test.getT();
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}
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void method2(Test<? super Zi> test){
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test.setT(new Zi1());
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test.getT();
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}
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}
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class Test<T>{
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T t;
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public T getT() {
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return t;
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}
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public void setT(T t) {
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this.t = t;
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}
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}
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class Zi1 extends Zi{}
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class Zi extends Fu{}
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class Fu extends Fu1{}
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class Fu1{}

‎java-stream/src/com/asher/function/time/LocalDateTimeTest.java

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package com.asher.function.time;
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import java.time.*;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.TemporalAdjusters;
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import java.util.Set;
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/**
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* @author : 张勇杰
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* @date : 2019/10/19 11:34
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* @Version : v1.0
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* @description
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**/
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public class LocalDateTimeTest {
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public static void main(String[] args) {
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test1();
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test2();
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// test3();
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test4();
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test5();
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}
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public static void test1(){
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LocalDateTime dateTime1 = LocalDateTime.now();
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System.out.println(dateTime1);
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LocalDateTime dateTime2 = LocalDateTime.of(2019,10,19,11,35,20);
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System.out.println(dateTime2);
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LocalDateTime dateTime3 = dateTime2.plusYears(2);
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System.out.println(dateTime3);
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}
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/**
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* Instant: 时间戳（以Unix元年：1970年1月1日00:00:00到某个时间之间的毫秒值
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*/
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public static void test2(){
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//获取UTC时区
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Instant now = Instant.now();
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System.out.println(now);
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OffsetDateTime offsetDateTime = now.atOffset(ZoneOffset.ofHours(8));
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System.out.println(offsetDateTime);
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Instant now1 = Instant.now();
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System.out.println(now1.getEpochSecond()-now.getEpochSecond());
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}
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/**
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* Duration 计算两个时间之间的间隔
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* period 计算两个日期之间的间隔
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*
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*/
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public static void test3() {
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Instant ins1 = Instant.now();
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try {
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Thread.sleep(1000);
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}catch (Exception e){
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}
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Instant ins2 = Instant.now();
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Duration duration = Duration.between(ins1,ins2);
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System.out.println(duration.toMillis());
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System.out.println("----------------");
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LocalTime lt1 = LocalTime.now();
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try {
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Thread.sleep(1000);
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}catch (Exception e){
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}
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LocalTime lt2 = LocalTime.now();
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Duration duration2 = Duration.between(lt1,lt2);
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System.out.println(duration2.toMillis());
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System.out.println("----------------");
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LocalDate ld1 = LocalDate.of(2015,1,1);
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LocalDate ld2 = LocalDate.now();
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Period period = Period.between(ld1,ld2);
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System.out.println(period);
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System.out.println(period.getYears());
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System.out.println(period.getMonths());
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System.out.println(period.getDays());
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}
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/**
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* TemporalAdjuster:时间矫正器
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*/
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public static void test4(){
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LocalDateTime ldt = LocalDateTime.now();
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System.out.println(ldt);
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LocalDateTime ldt2 = ldt.withDayOfMonth(10);
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System.out.println(ldt2);
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//本月第一天
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LocalDateTime with = ldt.with(TemporalAdjusters.firstDayOfMonth());
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System.out.println(with);
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//下一个周五
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LocalDateTime with1 = ldt.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
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System.out.println(with1);
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}
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/**
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* DateTimeFormatter 格式化时间日期
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*/
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public static void test5(){
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DateTimeFormatter dtf = DateTimeFormatter.ISO_DATE_TIME;
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LocalDateTime ldt = LocalDateTime.now();
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String format = ldt.format(dtf);
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System.out.println(format);
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System.out.println("---------");
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DateTimeFormatter dtf1 = DateTimeFormatter.ofPattern("yyyy-MM-dd");
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System.out.println(ldt.format(dtf1));
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test6();
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}
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/**
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* 获取时区列表
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*/
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public static void test6(){
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Set<String> availableZoneIds = ZoneId.getAvailableZoneIds();
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availableZoneIds.forEach(System.out::println);
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}
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}

‎java-stream/src/com/asher/function/time/SimpleDateFormatTest.java

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import java.text.SimpleDateFormat;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.format.DateTimeFormatter;
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import java.util.ArrayList;
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import java.util.Date;
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ExecutorService exec = Executors.newFixedThreadPool(10);
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List<Future<LocalDate>> futures = new ArrayList<>();
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for(int i =0;i<10;i++){
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Future<LocalDate> f = exec.submit(callable);
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futures.add(f);
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}
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e.printStackTrace();
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}
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});
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exec.shutdown();
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}
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}

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