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wangyibing
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add my practice
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‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/Context.java‎

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package org.github.yibing.spring.strategy;
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public class Context {
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private Strategy strategy;
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public Context(Strategy strategy) {
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this.strategy = strategy;
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}
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public int executeStrategy(int num1, int num2) {
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return strategy.doOperation(num1, num2);
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}
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/OperationAdd.java‎

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package org.github.yibing.spring.strategy;
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public class OperationAdd implements Strategy {
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@Override
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public int doOperation(int num1, int num2) {
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return num1 + num2;
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}
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/OperationMultiply.java‎

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package org.github.yibing.spring.strategy;
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public class OperationMultiply implements Strategy {
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@Override
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public int doOperation(int num1, int num2) {
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return num1 * num2;
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}
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/OperationSubtract.java‎

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package org.github.yibing.spring.strategy;
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public class OperationSubtract implements Strategy {
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@Override
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public int doOperation(int num1, int num2) {
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return num1 + num2;
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}
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/Strategy.java‎

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package org.github.yibing.spring.strategy;
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public interface Strategy {
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public int doOperation(int num1, int num2);
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/strategy/StrategyDemo.java‎

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package org.github.yibing.spring.strategy;
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public class StrategyDemo {
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public static void main(String[] args) {
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Context context = new Context(new OperationAdd());
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System.out.println("10+6=" + context.executeStrategy(10, 6));
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context = new Context(new OperationSubtract());
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System.out.println("10-6=" + context.executeStrategy(10, 6));
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}
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/stream/StreamDemo2.java‎

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package org.github.yibing.spring.stream;
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import org.junit.Test;
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import java.util.*;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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public class StreamDemo2 {
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static List<Employee> emps = Arrays.asList(new Employee(101, "张三", 28, 9999d),
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new Employee(101, "李四", 49, 666d),
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new Employee(102, "王五", 38, 333d),
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new Employee(103, "赵六", 12, 7777d),
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new Employee(104, "田七", 6, 222d)
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);
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public static void main(String[] args) {
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/*
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* 创建stream的三种方式
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*/
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//1.集合 list.stream(),
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Stream<Employee> stream = emps.stream();
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Employee[] array = (Employee[]) emps.toArray();
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// 2.数组 Arrays.stream(array)
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Stream<Object> stream1 = Arrays.stream(array);
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// 3.Stream.of(T)
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Stream<List<Employee>> stream2 = Stream.of(StreamDemo2.emps);
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}
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/**
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* 中间操作：
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* 筛选 filter()
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* 去重 distinct()
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* 取前面几条/跳过前面几条 limit()/skip()
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*/
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@Test
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public void test1() {
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//中间操作------筛选
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emps.stream().filter((e) -> e.getAge() > 30).forEach(e -> System.out.println(e.getAge()));
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// 取前面几条
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emps.stream().filter(e -> e.getId() > 101).limit(3).forEach(System.out::println);
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// 需要重写hashcode()和equals 才能去重
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emps.stream().distinct().forEach(System.out::println);
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}
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/**
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* 中间操作：
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* 映射，把集合中每个元素按照function映射为对应的类型
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*/
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@Test
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public void test2() {
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// 把每个元素按照function转换成相应类型，输出 还有mapToInteger,mapToLong等方法
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emps.stream().mapToDouble(Employee::getId).forEach(System.out::println);
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List<String> strList = Arrays.asList("a", "b", "c", "d");
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/*
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flapMap和map，传入同一个返回流的function,flatMap可以把所有流连成一个流
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*/
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Stream<Character> rStream = strList.stream().flatMap(StreamDemo2::filterCharacter);
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rStream.forEach(System.out::println);
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Stream<Stream<Character>> stream = strList.stream().map(StreamDemo2::filterCharacter);
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stream.forEach(sm -> sm.forEach(System.out::print));
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}
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public static Stream<Character> filterCharacter(String str) {
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List<Character> list = new ArrayList<>();
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for (Character ch : str.toCharArray()) {
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list.add(ch);
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}
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return list.stream();
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}
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/**
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* 中间操作：
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* sorted() 默认顺序排序，引用类型要实现Comparable
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* sorted(Comparator comp) 带参数，指定排序规则
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*/
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@Test
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public void test3() {
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// 把每个emps映射为属性:name,组成一个新流，然后按name排序输出
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emps.stream().map(Employee::getName).sorted().forEach(System.out::println);
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// 带参数的sorted,按照年龄排序，若相等就比较名字
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emps.stream().sorted((x, y) -> {
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if (x.getAge() == y.getAge()) {
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return x.getName().compareTo(y.getName());
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} else {
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return Integer.compare(x.getAge(), y.getAge());
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}
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}).forEach(System.out::println);
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}
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/**
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* 终止操作: 查找与匹配,返回boolean
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* allMatch(),所有元素都匹配才返回true
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* anyMatch(),只要有一个或多个元素匹配就返回true
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* noneMatch(),都不匹配就返回true,否则false
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*/
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@Test
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public void test4() {
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// 每个员工的名字都包含三 ，才返回true
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boolean b = emps.stream().allMatch(e -> e.getName().contains("三"));
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System.out.println(b);
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boolean b1 = emps.stream().noneMatch(e -> e.getName().contains("九"));
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System.out.println(b1);
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}
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/**
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* 终止操作：查找与匹配：返回元素
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* findFirst:返回第一个Optional<>
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* findAny:返回任意一个元素Optional<>
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* count 返回元素个数
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* max 返回最大值
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* min 返回最小值
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*/
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@Test
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public void test5() {
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Optional<Employee> first = emps.stream().findFirst();
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System.out.println(first.get());
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long count = emps.stream().count();
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System.out.println(count);
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}
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/**
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* 终止操作：规约reduce，将每个元素结合起来，得到一个值
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* reduce(BinaryOperator b)
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* reduce(T iden,BinaryOperator b) 返回Optional
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*/
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@Test
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public void test6() {
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// 规约，先转化成年龄集合，然后给他们求和
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Optional<Integer> sum = emps.stream().map(Employee::getAge).reduce(Integer::sum);
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System.out.println(sum.get());
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// 从 1 相加，相当于该集合多了一个 1求和
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Integer sum1 = emps.stream().map(Employee::getAge).reduce(1, Integer::sum);
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System.out.println(sum1);
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}
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/**
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* 终止操作：收集
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* 转换成lit、set、Collection
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* 求和，求平均数
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*/
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@Test
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public void test7() {
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Set<Employee> set = emps.stream().collect(Collectors.toSet());
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System.out.println(set);
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List<Employee> list = emps.stream().collect(Collectors.toList());
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Double salarySum = emps.stream().collect(Collectors.summingDouble(Employee::getSalary));
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}
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}

‎04spring/springboot01/pom.xml‎

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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<!-- <dependency>-->
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<!-- <groupId>com.rabbitmq</groupId>-->
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<!-- <artifactId>amqp-client</artifactId>-->
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<!-- <version>3.4.1</version>-->
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<!-- </dependency>-->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-amqp</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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<build>

‎04spring/springboot01/src/main/java/com/github/yibing/springboot01/config/RabbitConfig.java‎

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package com.github.yibing.springboot01.config;
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import org.springframework.amqp.core.Queue;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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@Configuration
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public class RabbitConfig {
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@Bean
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public Queue queue() {
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return new Queue("q_test_1");
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}
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}

‎04spring/springboot01/src/main/java/com/github/yibing/springboot01/consumer/Consumer.java‎

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//package com.github.yibing.springboot01.consumer;
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//
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//import com.github.yibing.springboot01.util.MqConnectionUtil;
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//import com.rabbitmq.client.Channel;
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//import com.rabbitmq.client.Connection;
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//import com.rabbitmq.client.QueueingConsumer;
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//
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//import java.io.IOException;
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//
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//public class Consumer {
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// public static void main(String[] args) throws IOException, InterruptedException {
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// Connection connection = MqConnectionUtil.getConnection();
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// Channel channel = connection.createChannel();
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// // 声明队列
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// channel.queueDeclare("q_test_1", false, false, false, null);
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// // 创建消费队列
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// QueueingConsumer consumer = new QueueingConsumer(channel);
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// // 消费消息
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// channel.basicConsume("q_test_1", consumer);
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// // 转换消费的消息
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// while (true) {
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// QueueingConsumer.Delivery delivery = consumer.nextDelivery();
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// String message = new String(delivery.getBody());
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// System.out.println("收到消息:" + message);
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// }
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//
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// }
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//}

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