类ArrayList的toString()方法的重载
List list = new ArrayList;
System.out.println(list.toString());
//ArrayList类
public class ArrayList extends AbstractList
implements List, Ra
import org.apache.commons.lang.StringUtils;
public class Test {
public static void main(String[] args) {
List list = new ArrayList();
list.add("1");
list.add("2");
list.add("3");
