java的list

List list=new ArrayList();//不加也可以，加了让list中只能存放string类型
list.add("string1");
System.out.print(list);

List list=new ArrayList();
        String[] array={"1","2"};//要向list中插入的string类型的数组
        list.add(array);
        for(String[] test1:list)//遍历数组
        {
            System.out.print(test1[0]);
        }

package test22;

import GetDataSource.getdatasourceClass;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ArrayHandler;
import org.apache.commons.dbutils.handlers.ArrayListHandler;

import java.sql.SQLException;
import java.util.*;

public class test222 {
    public static void main(String[] args)
    {
        QueryRunner runner=new QueryRunner(getdatasourceClass.getdatasourceFunction());
        try {
      List result_students=runner.query("select * from student_info where id>?",new ArrayListHandler(),1);
        for (Object[] student:result_students)
        {
            System.out.println(student[0]);
        }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        
    }
}