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Merge branch 'main' of https://github.com/codingCoder6/JavaCourseCodes into main
2 parents f165a9c + d9118f7 commit 49c6fd7

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9 files changed

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‎03concurrency/thread/src/main/java/com/github/thread/lock/ReadWriteLockDemo.java‎

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package com.github.thread.lock;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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public class ReadWriteLockDemo {
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public static void main(String[] args) {
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ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
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ReentrantReadWriteLock.ReadLock readLock = lock.readLock();
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ReentrantReadWriteLock.WriteLock writeLock = lock.writeLock();
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Task02 task02 = new Task02(readLock);
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Task02 task03 = new Task02(writeLock);
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for (int i = 0; i < 5; i++) {
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// new Thread(task02).start();
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new Thread(task03).start();
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}
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}
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}
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class Task02 implements Runnable {
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Lock lock;
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public Task02(Lock lock) {
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this.lock = lock;
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}
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@Override
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public void run() {
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lock.lock();
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System.out.println(lock.getClass().getName() + " " + Thread.currentThread().getName());
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lock.unlock();
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}
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}
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‎03concurrency/thread/src/main/java/com/github/thread/lock/ReentrantLockDemo.java‎

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package com.github.thread.lock;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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public class ReentrantLockDemo {
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public static void main(String[] args) {
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Task01 task01 = new Task01();
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new Thread(task01).start();
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new Thread(task01).start();
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}
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}
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class Task01 implements Runnable {
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Lock lock = new ReentrantLock();
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@Override
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public void run() {
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lock.lock();
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for (int i = 0; i < 10; i++) {
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System.out.println(Thread.currentThread().getName() + "运行 ------------" + i);
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}
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lock.unlock();
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}
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}

‎04spring/spring01/pom.xml‎

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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter</artifactId>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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</dependencies>
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‎04spring/spring01/src/main/java/org/github/yibing/spring/stream/Employee.java‎

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package org.github.yibing.spring.stream;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import lombok.ToString;
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@Data
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@AllArgsConstructor
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@NoArgsConstructor
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@ToString
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public class Employee {
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private int id;
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private String name;
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private int age;
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private Double salary;
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}

‎04spring/spring01/src/main/java/org/github/yibing/spring/stream/StreamDemo.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 StreamDemo {
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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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* stream 的创建方式
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*/
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// 集合创建
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ArrayList<String> list = new ArrayList<>();
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Stream<String> stream = list.stream();
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// 数组创建
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Integer[] integers = new Integer[10];
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Stream<Integer> stream1 = Arrays.stream(integers);
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// Stream静态方法传概念
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Stream<Integer> stream2 = Stream.of(1, 2, 3, 4, 5, 6);
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// 创建无线流
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Stream<Integer> stream3 = Stream.iterate(0, (x) -> x + 1);
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}
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// 中间操作-过滤
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@Test
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public void test1() {
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emps.stream()
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.filter((e) -> e.getAge() > 20)
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.limit(2) // limit(long n) :截取前面 n 条 ， skip(long n):跳过前面 n 条
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.forEach(System.out::println);
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}
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// 中间操作-映射
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@Test
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public void test2() {
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List<String> strList = Arrays.asList("aaa", "bbb", "ccc", "ddd", "eee");
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Stream<String> stream = strList.stream().map(String::toUpperCase);
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stream.forEach(System.out::println);
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// Stream<Stream<Character>> stream1 = strList.stream().map(StreamDemo::filterCharacter);
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// stream1.forEach((sm) -> {
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// sm.forEach(System.out::print);
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// });
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Stream<Character> stream2 = strList.stream().flatMap(StreamDemo::filterCharacter);
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stream2.forEach(System.out::print);
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}
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// 中间操作-排序
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@Test
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public void test3() {
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emps.stream()
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.map(Employee::getName)
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.sorted() // 排序
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.forEach(System.out::println);
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emps.stream()
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.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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}) // 排序
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.forEach(System.out::println);
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}
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// 查找与匹配
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@Test
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public void test4() {
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// 查看每个名字中是否都包含"五" ,这里返回false
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boolean b = emps.stream().allMatch((e) -> e.getName().contains("五"));
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System.out.println(b);
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// 返回第一个
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Optional<Employee> first = emps.stream().findFirst();
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System.out.println(first.get());
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}
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// 归约
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@Test
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public void test5() {
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// 从0开始加 ，加到10
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List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
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Integer sum = list.stream().reduce(0, (x, y) -> x + y);
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System.out.println(sum);
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// 求所有员工的薪水总和
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Optional<Double> op = emps.stream().map(Employee::getSalary).reduce(Double::sum);
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System.out.println(op.get());
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}
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//收集 ： 将流转换成其他形式，collect(Collectors.（））
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@Test
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public void test6() {
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List<String> list = emps.stream().map(Employee::getName).collect(Collectors.toList());
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list.forEach(System.out::println);
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Set<String> set = emps.stream().map(Employee::getName).collect(Collectors.toSet());
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set.forEach(System.out::println);
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// 薪水求和
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Double sum = emps.stream().collect(Collectors.summingDouble(Employee::getSalary));
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//求平均薪水
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Double avg = emps.stream().collect(Collectors.averagingDouble(Employee::getSalary));
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}
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public static Stream<Character> filterCharacter(String str) {
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ArrayList<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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}

‎04spring/spring01/target/classes/META-INF/spring01.kotlin_module‎

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‎04spring/spring01/target/classes/application.properties‎

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‎04spring/spring01/target/classes/applicationContext.xml‎

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‎04spring/spring01/target/classes/instantiate-type.xml‎

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