java如何取得Object中的值？ java如何取得Object中的值
java\u600e\u4e48\u8bfb\u53d6Object\u91cc\u9762\u7684\u6570\u636e\u91c7\u7528\u53cd\u5c04\uff0c\u83b7\u53d6\u51faObject \u7684\u5c5e\u6027\u7b49\u3002
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Field[] field = model.getClass().getDeclaredFields(); // \u83b7\u53d6\u5b9e\u4f53\u7c7b\u7684\u6240\u6709\u5c5e\u6027\uff0c\u8fd4\u56deField\u6570\u7ec4
try {
for (int j = 0; j < field.length; j++) { // \u904d\u5386\u6240\u6709\u5c5e\u6027
String name = field[j].getName(); // \u83b7\u53d6\u5c5e\u6027\u7684\u540d\u5b57
name = name.substring(0, 1).toUpperCase() + name.substring(1); // \u5c06\u5c5e\u6027\u7684\u9996\u5b57\u7b26\u5927\u5199\uff0c\u65b9\u4fbf\u6784\u9020get\uff0cset\u65b9\u6cd5
String type = field[j].getGenericType().toString(); // \u83b7\u53d6\u5c5e\u6027\u7684\u7c7b\u578b
if (type.equals("class java.lang.String")) { // \u5982\u679ctype\u662f\u7c7b\u7c7b\u578b\uff0c\u5219\u524d\u9762\u5305\u542b"class "\uff0c\u540e\u9762\u8ddf\u7c7b\u540d
Method m = model.getClass().getMethod("get" + name);
String value = (String) m.invoke(model); // \u8c03\u7528getter\u65b9\u6cd5\u83b7\u53d6\u5c5e\u6027\u503c
if (value == null) {
m = model.getClass().getMethod("set"+name,String.class);
m.invoke(model, "");
}
}
if (type.equals("class java.lang.Integer")) {
Method m = model.getClass().getMethod("get" + name);
Integer value = (Integer) m.invoke(model);
if (value == null) {
m = model.getClass().getMethod("set"+name,Integer.class);
m.invoke(model, 0);
}
}
if (type.equals("class java.lang.Boolean")) {
Method m = model.getClass().getMethod("get" + name);
Boolean value = (Boolean) m.invoke(model);
if (value == null) {
m = model.getClass().getMethod("set"+name,Boolean.class);
m.invoke(model, false);
}
}
if (type.equals("class java.util.Date")) {
Method m = model.getClass().getMethod("get" + name);
Date value = (Date) m.invoke(model);
if (value == null) {
m = model.getClass().getMethod("set"+name,Date.class);
m.invoke(model, new Date());
}
}\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000// \u5982\u679c\u6709\u9700\u8981,\u53ef\u4ee5\u4eff\u7167\u4e0a\u9762\u7ee7\u7eed\u8fdb\u884c\u6269\u5145,\u518d\u589e\u52a0\u5bf9\u5176\u5b83\u7c7b\u578b\u7684\u5224\u65ad
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
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#include
main()
{
printf("hello!");
}
\u7528VC\u6253\u5f00\u540e\u7f16\u8bd1\uff0c\u5b83\u4f1a\u9ed8\u8ba4\u6309\u63a7\u5236\u53f0\u7a0b\u5e8f\u8fdb\u884c\u7f16\u8bd1\uff0c\u8fd0\u884c\u5c31\u662fcmd\u6a21\u5f0f\u3002\u8fd9\u6bb5\u4ee3\u7801\u662f\u63a7\u5236\u53f0\u7a0b\u5e8f\u7684\u683c\u5f0f\u3002
\u4e0b\u9762\u4e00\u6bb5\u662fwin32\u7a0b\u5e8f\u683c\u5f0f\uff1a
#include
#includeLRESULTCALLBACKMyWindowsProc(
HWNDhwnd,//handletowindow
UINTuMsg,//messageidentifier
WPARAMwParam,//firstmessageparameter
LPARAMlParam//secondmessageparameter
)
{
switch(uMsg)
{
caseWM_CLOSE:
DestroyWindow(hwnd);
break;
caseWM_DESTROY:
PostQuitMessage(0);
break;
default:
returnDefWindowProc(hwnd,uMsg,wParam,lParam);
}
return0;
}intWINAPIWinMain(
HINSTANCEhInstance,
HINSTANCEhPrevInstance,
LPSTRlpCmdLine,
intnCmdShow
)
{
WNDCLASSstWnd;
stWnd.cbClsExtra=0;
stWnd.cbWndExtra=0;
stWnd.hbrBackground=(HBRUSH)GetStockObject(GRAY_BRUSH);
stWnd.hCursor=NULL;//LoadCursor(NULL,IDC_CROSS);
stWnd.hIcon=NULL;//LoadIcon(NULL,IDI_ERROR);
stWnd.hInstance=hInstance;
stWnd.lpfnWndProc=MyWindowsProc;
stWnd.lpszClassName="MyWindow";
stWnd.lpszMenuName=NULL;
stWnd.style=CS_HREDRAW|CS_VREDRAW;RegisterClass(&stWnd);
HWNDstWin;
stWin=CreateWindow("MyWindow","\u6211\u7684Windows\u7a0b\u5e8f\u6d4b\u8bd5!",WS_OVERLAPPEDWINDOW,0,0,400,300,NULL,NULL,hInstance,NULL);
ShowWindow(stWin,SW_SHOWNORMAL);MSGstMsg;
while(GetMessage(&stMsg,NULL,0,0))
{
TranslateMessage(&stMsg);
DispatchMessage(&stMsg);
}
return0;
}
\u8fd9\u662f\u4e00\u4e2a\u6807\u51c6\u7684win32\u7a0b\u5e8f\uff0c\u8fd0\u884c\u540e\u53ef\u751f\u6210\u4e00\u4e2a\u7a97\u53e3\u3002intWINAPIWinMain\uff08\uff09\u4e3a\u7a0b\u5e8f\u7684\u5165\u53e3\u51fd\u6570\uff0c\u91cc\u9762\u9996\u5148\u8981\u6ce8\u518c\u7a97\u53e3\u7c7b\uff0c\u518d\u8fdb\u884c\u6d88\u606f\u5faa\u73af\u7b49\u7b49\uff0c\u6bd4\u63a7\u5236\u53f0\u7a0b\u5e8f\u590d\u6742\u7684\u591a\u3002\u5728VC\u4e0b\u65b0\u5efa\u4e00\u4e2awin32Application\u5de5\u7a0b\uff0c\u628a\u8fd9\u6bb5\u4ee3\u7801\u4fdd\u5b58\u4e3a.cpp\u6dfb\u52a0\u5230\u5de5\u7a0b\u91cc\u5c31\u53ef\u4ee5\u8fd0\u884c\u3002
\u54ea\u91cc\u4e0d\u660e\u767d\u8bf4\u660e\u767d\u70b9\uff0c\u522b\u4e00\u53e5\u201c\u8fd8\u662f\u4e0d\u592a\u660e\u767d\u201d\u5c31\u5b8c\u4e86.win32\u7a0b\u5e8f\u662f\u5e26\u8d44\u6e90\u7684\uff0c\u8d44\u6e90\u91cc\u9762\u5305\u542b\u56fe\u7247\uff0c\u58f0\u97f3\u7b49\u4e00\u4e9b\u591a\u5a92\u4f53\u5143\u7d20\u3002\u8d44\u6e90\u6587\u4ef6\u6269\u5c55\u540d\u4e3a.rc\u3002\u7f16\u8bd1\u540e\u4e3a.res\u3002\u6bcf\u4e2a\u8d44\u6e90\u90fd\u6709ID\uff0c\u7a0b\u5e8f\u91cc\u9762\u8c03\u7528\u8d44\u6e90\u7684\u65f6\u5019\u5c31\u901a\u8fc7ID\u8fdb\u884c\u8c03\u7528\u3002\u7a0b\u5e8f\u7f16\u8bd1\u540e\u6269\u5c55\u540d\u4e3a.obj\uff0c\u94fe\u63a5\u65f6\uff0c\u94fe\u63a5\u5668\u4f1a\u81ea\u52a8\u628a.res\u6587\u4ef6.obj\u6587\u4ef6\u94fe\u63a5\u5230\u4e00\u8d77\u5f62\u6210\u4e00\u4e2a.exe\u6587\u4ef6\u3002\u8fd9\u6837\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c31\u4f1a\u51fa\u73b0\u56fe\u7247\uff0c\u58f0\u97f3\u7b49\u7b49\u3002\u8fd9\u4e9b\u90fd\u662fwindows\u7f16\u7a0b\u91cc\u9762\u57fa\u672c\u7684\u77e5\u8bc6\uff0c\u4f60\u53bb\u5b66\u4e00\u4e0b\u5c31\u884c\u4e86\u3002
for(Object object : list) {
Map entry = (Map)object;
值 = entry.get(‘字段名’);}
象（object），台湾译作物件，是面向对象（Object Oriented）中的术语，既表示客观世界问题空间（Namespace）中的某个具体的事物，又表示软件系统解空间中的基本元素。定义一个嵌入的对象。请使用此元素向您的 XHTML 页面添加多媒体。
想学习Java的小伙伴， Java基础教程分享给你们，本节课程主讲内容：Object类的toString()方法详解
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