Java string and memory leaks

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

// http://www.jtraining.com/blogs/string-and-memory-leaks-in-java.html
// http://www.javablogging.com/string-and-memory-leaks/
public class TestStringOutOfMemoryError {
	
	public static void main(String[] args) throws Exception {
		testWithOutOfMemoryError();
		//testWithoutOutOfMemoryError();
		System.out.println("HaHa!");
	}

	public static void testWithOutOfMemoryError() {
		List<String> list = new ArrayList<String>();
		for(int i = 0; i < 10000; i++) {
			list.add(getStringWithOutOfMemoryError());
		}
	}

	public static void testWithoutOutOfMemoryError() {
		List<String> list = new ArrayList<String>();
		for(int i = 0; i < 10000; i++) {
			list.add(getStringWithoutOutOfMemoryError());
		}
	}

	public static String getStringWithOutOfMemoryError() {
		StringBuffer sb = new StringBuffer();
		sb.append(System.currentTimeMillis());
		for(int i = 0; i < 10000; i++) {
			sb.append("1234567890");
		}
		String s = sb.toString();
		return s.substring(0, 13);
	}

	public static String getStringWithoutOutOfMemoryError() {
		StringBuffer sb = new StringBuffer();
		sb.append(System.currentTimeMillis());
		for(int i = 0; i < 10000; i++) {
			sb.append("1234567890");
		}
		String s = sb.toString();
		return new String(s.substring(0, 13));
	}
}