private static DatabaseManager dbm = new DatabaseManager("codetable", 1000,
            "com.mysql.jdbc.Driver", "jdbc:mysql://localhost:3306/codetable",
            "root", "root");


    public static void method2() {
        try {
            List<CustTable> list = new ArrayList<CustTable>();
            List<CustTable> cutList = (List<CustTable>) dbm.executeQuery(list,
                    "select * from custtable");
            for (int i = 0; i < cutList.size(); i++) {
                System.out.println(cutList.get(i).getCustId());//异常产生地方
                // System.out.println(cutList.get(i).getClass());
            }
            dbm.close();
        } catch (DatabaseException e) {
            e.printStackTrace();
        }
    }
package com.mainClass;


public class CustTable {

    private String custId;
    private String value;
    private String codeNum;
    private String valueId;
    public CustTable() {

    }

    public CustTable(String custId) {
        this.custId = custId;
    }

    public CustTable(String custId, String value, String codeNum, String valueId) {
        this.custId = custId;
        this.value = value;
        this.codeNum = codeNum;
        this.valueId = valueId;
    }

    public String getCustId() {
        return custId;
    }

    public void setCustId(String custId) {
        this.custId = custId;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String getCodeNum() {
        return codeNum;
    }

    public void setCodeNum(String codeNum) {
        this.codeNum = codeNum;
    }

    public String getValueId() {
        return valueId;
    }

    public void setValueId(String valueId) {
        this.valueId = valueId;
    }

    public String toString() {
        return custId + ", " + value + ", " + codeNum + ", " + valueId;
    }
}