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Maven Build Life Cyles

Following are the maven build life cycles.

Clean - Removes the generated files in 'target' folder.

command : mvn clean

Validate - It validates your project and verify all the necessary information is there in project or not.

mvn  valiate

Compile - It compiles your project code.

mvn compile

Package - It takes the compiled code and packaged to JAR/WAR/EAR. It also compiles your code if your code is not compiled.

mvn package

Install -   It takes the packaged code and puts in your local maven repository (M2_HOME). It also does the compile and package if these are not already been done.

mvn install

Deploy - It takes the package and puts in remote repository for sharing accross team members or for other projects.

mvn deploy


FYI - Above commands can be used as variety of combinations.
e.g. mvn clean install
mvn clean package
mvn clean compile package install

To skip the tests to run 
mvn clean install -DskipTests



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Compress a String

package com.sbs.java8.praticse;

public class StringCompression {

public StringCompression() {
// TODO Auto-generated constructor stub
}

public static void main(String[] args) {
System.out.println(compressString("aaaabbbbbccccAAAAccccccccdefg"));
}

public static String compressString(String str) {
//String str = "aaaabbbbbcccc";
char[] charArray = str.toCharArray();
String compressedString = "";
int i = 0;
while (i < charArray.length) { int counter = 1; int j = i + 1; while (j < charArray.length && charArray[i] == charArray[j]) { counter++; j++; i++; } compressedString = compressedString + charArray[i] + counter; i++; } //System.out.println(compressedString); String output =(compressedString.length() > charArray.length)? str: compressedString;
return output;
}
}