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java-training
Commit 3660460f by 陈文顺
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.gitignore 0 → 100644
# Created by .ignore support plugin (hsz.mobi)
#.gitignore
.idea/workspace.xml
*.iml
.idea
*/target/
*/*.iml
eureka/lib/
payment-service/src/test/source/
#begin!
# Created by junliang.li
RemoteSystemsTempFiles/
target/
.metadata/*
.metadata/
*.log
!.mvn/wrapper/maven-wrapper.jar
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
### NetBeans ###
nbproject/private/
build/
nbbuild/
dist/
nbdist/
.nb-gradle/
# Other Editor's noise
*~
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# MacOSX noise
.DS_Store
# end!
#.gitignore
.idea/
commons-amqp/commons-amqp.iml
commons-base/commons-base.iml
commons-dao/commons-dao.iml
commons-redis/commons-redis.iml
commons-service/commons-service.iml
productService/productService.iml
demo1/pom.xml 0 → 100644
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>java-training</artifactId>
<groupId>cn.freemud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>demo1</artifactId>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>20.0</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.32</version>
</dependency>
</dependencies>
</project>
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demo1/src/main/java/cn/freemud/demo/po/User.java 0 → 100644
package cn.freemud.demo.po;
import com.alibaba.fastjson.JSON;
/**
* Created by chenwenshun on 2018/9/27.
*/
public class User {
private Long id;
private String username;
public User(Long id, String username) {
this.id = id;
this.username = username;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String toString() {
return JSON.toJSONString(this);
}
}
demo1/src/test/java/cn/freemud/demo/GuavaTests.java 0 → 100644
package cn.freemud.demo;
import cn.freemud.demo.po.User;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.*;
import com.google.common.util.concurrent.RateLimiter;
import org.junit.Test;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
/**
* Created by chenwenshun on 2018/9/27.
*/
public class GuavaTests {
@Test
public void testSplit(){
String mock = ",,a, b,c,,d,,";
List<String> list = Splitter.on(",").omitEmptyStrings().trimResults().splitToList(mock);
System.out.println(list.toString());
Joiner joiner = Joiner.on("/").skipNulls();
String result = joiner.join("a", 1, null, 'c');
System.out.println(result);
String[] names = new String[]{"bella", "tina", "ashun"};
System.out.println(joiner.join(names));
List<String> time = Splitter.on(":").splitToList("10:56");
System.out.println(time);
}
@Test
public void testRateLimite(){
RateLimiter limiter = RateLimiter.create(3);
// RateLimiter limiter = RateLimiter.create(10, 5, TimeUnit.SECONDS);
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
for (; ; ) {
limiter.acquire();
System.out.println(df.format(new Date()));
}
}
@Test
public void testMultimap(){
ListMultimap<Integer, String> listMutilMap = ArrayListMultimap.create();
listMutilMap.put(100, "1001");
listMutilMap.put(2, "21");
listMutilMap.put(2, "22");
listMutilMap.put(1, "1");
listMutilMap.put(1, "2");
listMutilMap.put(43, "431");
System.out.println(listMutilMap.keySet());//
System.out.println(listMutilMap.get(2));
}
/**
* 不可变集合
*/
@Test
public void test4(){
List<String> list = Lists.newArrayList("a", "b", "c");
Collection<String> unmodifiableCollection = Collections.unmodifiableCollection(list);
ImmutableList<String> immutableList = ImmutableList.copyOf(list);
list.add("e");
System.out.println(unmodifiableCollection);
System.out.println(immutableList);
immutableList.add("a");
}
/**
* 集合 索引
*/
@Test
public void test5(){
List<User> users = Lists.newArrayList();
users.add(new User(1L,"haha"));
users.add(new User(2L,"bella"));
users.add(new User(3L,"tina"));
users.add(new User(4L,"tom"));
users.add(new User(5L,"jerry"));
users.add(new User(6L,"tony"));
users.add(new User(7L,"tony"));
/**
* 对集合添加唯一索引
*/
ImmutableMap<Long, User> uniqueIndex = FluentIterable
.from(users).uniqueIndex(new Function<User, Long>() {
@Override
public Long apply(User user) {
return user.getId();
}
});
User user = uniqueIndex.get(3L);
System.out.println(user);
/**
* 对集合添加非唯一索引
*/
ImmutableListMultimap<String, User> index = FluentIterable
.from(users).index(new Function<User,String>() {
@Override
public String apply(User user) {
return user.getUsername();
}
});
List<User> userList = index.get("tony");
System.out.println(userList);
}
/**
* 集合运算主要有：并集、交集、差集。
*/
@Test
public void test51() {
List<Integer> list1 = Lists.newArrayList(1, 2, 2, 1, 4, 5, 4, 3);
List<Integer> list2 = Lists.newArrayList(1, 2, 3, 7, 8, 9);
Sets.SetView<Integer> union = Sets.union(Sets.newHashSet(list1), Sets.newHashSet(list2));
Sets.SetView<Integer> difference = Sets.difference(Sets.newHashSet(list1), Sets.newHashSet(list2));
Sets.SetView<Integer> intersection = Sets.intersection(Sets.newHashSet(list1), Sets.newHashSet(list2));
System.out.println(union);
System.out.println(difference);
System.out.println(intersection);
}
}
pom.xml 0 → 100644
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.freemud</groupId>
<artifactId>java-training</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>demo1</module>
</modules>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
</project>
\ No newline at end of file
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