Javaの文字列をInputStreamに変換する方法

package com.mkyong;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class StringToInputStreamExample {
    public static void main(String[]args) throws IOException {
    String str = "This is a String ~ GoGoGo";

   //convert String into InputStream
    InputStream is = new ByteArrayInputStream(str.getBytes());

   //read it with BufferedReader
    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    String line;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }

    br.close();
   }
}