我试着用Java打印"Hello!“(下面的代码),但是得到了一个错误,
`
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
`
这是错误
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.
我已经用Kotlin创建了SelfGeneration领域类,并在添加不再构建该项目之后。我该怎么解决这个问题?
@RealmClass open class SelfGeneration() : BaseRealmObject {
@PrimaryKey override var id: Int? = null
open var type: ItemType? = null
open var model: String? = null
open var watt: Int? = null
companion object {
fun g
是否有办法在编译阶段和运行时实现constexpr函数的不同行为?
考虑以下示例(使用来自D: static if的理论特性):
constexpr int pow( int base , int exp ) noexcept
{
static if( std::evaluated_during_translation() ) {
auto result = 1;
for( int i = 0 ; i < exp ; i++ )
result *= base;
return result;
} els
这为什么要编译呢?(在Oracle java 5和java 6下都尝试过了(是的,我知道,我适应得很慢)
public abstract class BaseClass
{
public abstract void methodA(String abc);
public abstract String methodB(String abc);
}
public final class ConcreteClass
extends BaseClass
{
}
只要将这两个类弹出到单独的文件中,调用它们上的javac,然后poof,它们就会编译。由于抽象方法是由实现者实现的,所以
private Map<Linha, Long> mapLinhas = new HashMap<Linha, Long>();
for (final Linha linha : this.mapLinhas.keySet())
{
final Long idLinha = this.mapLinhas.get(linha);
final Unidade b = Cache.getInstance().getUnidade(a);
linha.setUnidade(b);