Program: How to convert list to csv string format?

This example shows how to convert given list of strings to comma seperated values (csv) format.

package com.java2novice.arraylist;

import java.util.ArrayList;
import java.util.List;

public class MyListToCsvString {

	public String getListAsCsvString(List<String> list){
		
		StringBuilder sb = new StringBuilder();
		for(String str:list){
			if(sb.length() != 0){
				sb.append(",");
			}
			sb.append(str);
		}
		return sb.toString();
	}
	
	public static void main(String a[]){
		
		List<String> li1 = new ArrayList<String>(){
			{
				this.add("animal");
				this.add("nuts");
				this.add("java");
			}
		};
		MyListToCsvString mtc = new MyListToCsvString();
		System.out.println(mtc.getListAsCsvString(li1));
		List<String> li2 = new ArrayList<String>(){
			{
				this.add("java");
				this.add("unix");
				this.add("c++");
			}
		};
		System.out.println(mtc.getListAsCsvString(li2));
	}
}

animal,nuts,java
java,unix,c++