How to specify jar files in command line?

Java takes the current directory as default classpath, you can customize this using -cp option.

 

Syntax

In Linux and MAC systems

javac -cp jar1:jar2:jar3:dir1:dir2:. HelloWorld.java
java -cp jar1:jar2:jar3:dir1:dir2:. HelloWorld

 

In Windows systems

javac -cp jar1;jar2;jar3;dir1;dir2;. HelloWorld.java
java -cp jar1;jar2;jar3;dir1;dir2;. HelloWorld

 

Let’s see it with an example.

 

PrettyJson.java

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

public class PrettyJson {

	public static void main(String args[]) {
		String uglyJson = "{\"name\": \"Krishna\", \"age\": 31}";

		Gson gson = new GsonBuilder().setPrettyPrinting().create();
		JsonElement jsonElement = JsonParser.parseString(uglyJson);
		String prettyJsonString = gson.toJson(jsonElement);

		System.out.println(prettyJsonString);
	}

}

 

In my case gson-2.8.9.jar library is located at '/Users/Shared/jars/' folder.

$javac -cp /Users/Shared/jars/gson-2.8.9.jar:. PrettyJson.java 
$
$java -cp /Users/Shared/jars/gson-2.8.9.jar:. PrettyJson
{
  "name": "Krishna",
  "age": 31
}

 

 

   

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