Maven中两个命令clean 和 install的使用

package com.imooc.maven01.util;

import com.imooc.maven01.model.HelloWorld;

public class Speak{
	public String sayHi(){
		return new HelloWorld().sayHello();
	}
}

package com.imooc.maven01.util;

import org.junit.*;
import org.junit.Assert.*;

public class SpeakTest{
	@Test
	public void testHi(){
		Assert.assertEquals("Hello World!", new Speak().sayHi());
	}
}

<?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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
	
	<groupId>com.imooc.maven02</groupId>
	<artifactId>maven02-model02</artifactId>
	<version>0.0.1SNAPSHOT</version>
	
	<properties>

	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

	<maven.compiler.source>1.8</maven.compiler.source>
	<maven.compiler.target>1.8</maven.compiler.target>
	</properties>
	
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.10</version>
		</dependency>
		<dependency>
			<groupId>com.imooc.maven01</groupId>
			<artifactId>maven01-model</artifactId>
			<version>0.0.1SNAPSHOT</version>
		</dependency>
	</dependencies>
</project>