在J2ME中,我这样做:
getClass().getResourceAsStream("/raw_resources.dat");
但是在android中,我总是在这上面为空,为什么?
尝试Build Project在控制台中获取此类输出时遇到此问题:
[2010-07-19 23:29:23 - myProject]
trouble processing "javax/net/SocketFactory.class":
[2010-07-19 23:29:23 - myProject]
Attempt to include a core VM class in something other than a core library.
It is likely that you have attempted to include the core library from a desktop
virtual machine into an application, which will most assuredly not work. If
you really intend to build a core library -- which is only appropriate as
part of creating a full virtual machine binary, as opposed to compiling …Run Code Online (Sandbox Code Playgroud) 假设我有3个类A,B并且C每个类都扩展了前一个类.
如何调用代码A.myMethod()从C.myMethod()如果B也实现myMethod?
class A
{
public void myMethod()
{
// some stuff for A
}
}
class B extends A
{
public void myMethod()
{
// some stuff for B
//and than calling A stuff
super.myMethod();
}
}
class C extends B
{
public void myMethod()
{
// some stuff for C
// i don't need stuff from b, but i need call …Run Code Online (Sandbox Code Playgroud) 在StringBuilder类中,我可以这样做:
StringBuilder sb = new StringBuilder();
sb.append( "asd").append(34);
Run Code Online (Sandbox Code Playgroud)
方法append返回StringBuilder实例,我可以连续调用它.
我的问题是可以在静态方法上下文中这样做吗?没有类实例
我的 App 类实现了 Configuration.Provider.getWorkManagerConfiguration,关于本文:https ://developer.android.com/topic/libraries/architecture/workmanager/advanced/custom-configuration#on-demand
我在 AndroidManifest.xml 中使用此字符串切换了默认初始化程序:
<provider
android:name="androidx.work.impl.WorkManagerInitializer"
android:authorities="${applicationId}.workmanager-init"
tools:node="remove" />
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该代码按照我的需要工作 - 没有默认的初始化程序调用,但只有 Configuration.Provider.getWorkManagerConfiguration。
如果我运行 lint 检查,我仍然会看到错误:使用按需初始化时删除 androidx.work.impl.WorkManagerInitializer。
关于如何处理它有什么想法吗?
我有处理这种数据的java应用程序:
class MyData
{
Date date;
double one;
double two;
String comment;
}
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所有数据都以csv格式存储在硬盘上,此类数据序列的最大大小约为150 mb,此时我只需将其完全加载到内存中并使用它.
现在我的任务是增加数百GB的最大数据序列.我想我需要使用DB,但之前我没有使用它们.
我的问题:
关于java < - > DB的任何其他提示和技巧都是受欢迎的!