用于LARG-DB基于动态多区域菜单中,我创建了一个类MenuPoint:如何在扩展类后扩展类数组/属性类的数组属性?
class MenuPoint{
public int areaId;
public int preID;
public String name;
public String desc;
public String stepInImg = "bsp.img";
public String stepOutImg = "bsp.img";
public String detailedForm = "bsp.fxml";
public String detailedImg = "bsp.img";
public String [] additionalOptionForm = new String[0];
public String [] additionalOptionName = new String[0];
public String [] additionalOptionImg = new String[0];}
和初始化它作为我的主类的长度为0的数组:MenuController
public MenuPoint [] menuItem = new MenuPoint[0];
我使用API调用通过初始化MenuController来获取DB存储的信息。
int dataStructlength = 12;
String[] exampleApiResultKeys = new String[dataStructlength];
exampleApiResultKeys[0] = "SITE_NUMBER";
exampleApiResultKeys[1] = "SITE_DESC";
exampleApiResultKeys[2] = "SITE_NUMBER_EXT";
exampleApiResultKeys[3] = "CELL_NUMBER";
exampleApiResultKeys[4] = "CELL_DESC";
exampleApiResultKeys[5] = "CELL_TYPE";
exampleApiResultKeys[6] = "MACHINE_GROUP_NUMBER";
exampleApiResultKeys[7] = "MACHINE_GROUP_DESC";
exampleApiResultKeys[8] = "MACHINE_GROUP_TYPE";
exampleApiResultKeys[9] = "STATION_NUMBER";
exampleApiResultKeys[10] = "STATION_DESC";
exampleApiResultKeys[11] = "STATION_TYPE";
exampleApiController.test_mdataGetMachineAssetStructure(exampleApiFilter, exampleApiResultKeys);
for(int i = 0; exampleApiController.resultValues.value != null && i < exampleApiController.resultValues.value.length/12; i++)
{
boolean isUseless = false;
for(int a = 0; a < dataStructlength; a ++)
if(true == exampleApiController.resultValues.value[i*dataStructlength+a].trim().isEmpty())
isUseless = true;
if(!isUseless)
{
int preId= -1;
if("M".equals(exampleApiController.resultValues.value[i*12+5]))
{
if(giveItemId(0, preId, exampleApiController.resultValues.value[i*12]) >= 0)
preId = giveItemId(0, preId, exampleApiController.resultValues.value[i*12]);
else
preId = addMenuItem(0, preId, exampleApiController.resultValues.value[i*12], exampleApiController.resultValues.value[i*12+1], "bsp.form");
}
if("M".equals(exampleApiController.resultValues.value[i*12+5]))
{
if(giveItemId(1, preId, exampleApiController.resultValues.value[i*12+3]) >= 0)
preId = giveItemId(0, preId, exampleApiController.resultValues.value[i*12+3]);
else
preId = addMenuItem(1, preId, exampleApiController.resultValues.value[i*12+3], exampleApiController.resultValues.value[i*12+4], "bsp.form");
}
if("M".equals(exampleApiController.resultValues.value[i*12+8]))
{
if(giveItemId(2, preId, exampleApiController.resultValues.value[i*12+6]) >= 0)
preId = giveItemId(0, preId, exampleApiController.resultValues.value[i*12+6]);
else
preId = addMenuItem(2, preId, exampleApiController.resultValues.value[i*12+6], exampleApiController.resultValues.value[i*12+7], "bsp.form");
}
if("M".equals(exampleApiController.resultValues.value[i*12+11]))
{
if(giveItemId(3, preId, exampleApiController.resultValues.value[i*12+9]) >= 0)
preId = giveItemId(0, preId, exampleApiController.resultValues.value[i*12+9]);
else
preId = addMenuItem(3, preId, exampleApiController.resultValues.value[i*12+9], exampleApiController.resultValues.value[i*12+10], "bsp.form");
}
}
giveItemId: 我用下面的代码的结果存储
public int giveItemId(int areaId_temp, int preId_temp, String name_temp)
{
for(int i = 0; i < menuItem.length; i++)
{
if(menuItem[i].areaId == areaId_temp && menuItem[i].name.equals(name_temp) && menuItem[i].preID == preId_temp)
return i;
}
return -1;
}
addMenuItem:
public int addMenuItem(int areaId_temp, int preId_temp, String name_temp, String desc_temp, String form_temp)
{
Object newArray1 = Array.newInstance(menuItem.getClass().getComponentType(), Array.getLength(menuItem)+1); // +1 Arrayfeld
System.arraycopy(menuItem, 0, newArray1, 0, Array.getLength(menuItem));
menuItem = (MenuPoint[]) newArray1; // expend but missing attributes
menuItem[menuItem.length-1].areaId = areaId_temp;
menuItem[menuItem.length-1].preID = preId_temp;
menuItem[menuItem.length-1].name = name_temp;
menuItem[menuItem.length-1].desc = desc_temp;
menuItem[menuItem.length-1].detailedForm = form_temp;
return menuItem.length-1;
}
我发现菜单项dons't花费之后进行的任何属性。
我是否必须创建MenuPoint的“新”实例才能使其工作? 甚至可以在不丢失属性或值的情况下花费类数组吗? 它很好用,因为最后menuItem只是一个指针数组,指向多个工作存储地址,不是吗?
谢谢你们提供任何提示或更好的概念,你可以给我。 (我知道这个班级概念很愚蠢,但我不知道更好的) 请原谅我的坏语法。
使用'List'。这些会在添加项目时自动调整大小。当您知道施工时物品的确切数量时,阵列可用于;即使这样一个'List'通常更方便。 – 2015-02-09 08:35:22
P.S.张贴之前请对您的问题进行拼写检查。 – 2015-02-09 08:36:21
“我发现那menuItem ...”怎么样?你有一些代码来演示它吗? – laune 2015-02-09 08:41:17