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));
}
}