小编Cha*_*lie的帖子

我想更改另一个结构中数组中结构的值：

struct Foo<'a> {
    bar: &'a [&'a mut Bar]
}

struct Bar {
    baz: u16
}

impl<'a> Foo<'a> {
    fn add(&mut self, x: u16) {
        self.bar[0].add(x);
    }
}

impl Bar {
    fn add(&mut self, x: u16) {
        self.baz += x;
    }
}

这给出了一个错误：

struct Foo<'a> {
    bar: &'a [&'a mut Bar]
}

struct Bar {
    baz: u16
}

impl<'a> Foo<'a> {
    fn add(&mut self, x: u16) {
        self.bar[0].add(x);
    }
}

impl Bar {
    fn add(&mut self, x: u16) {
        self.baz …

C#的绝对新手.试图运行这个程序,输出根本不会显示任何计算.为什么？我并不想通过P,Q,R,S为ADD,SUB,乘,除等,另外,我怎样才能把之间的"请输入数字"和用户名的空间？

string userName;
double  x, y;

Console.WriteLine(" Enter Your Name ");
userName = Console.ReadLine();
Console.WriteLine(" Please Enter A Number "+ userName);
First = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("Please Enter Another Number"+ userName);
Second = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("The addition of Two Numbers is",x,y, x*y);
Console.WriteLine("The substraction of Two Numbers is",x,y,x/y);
Console.WriteLine("The multiplication of Two Numbers is",x,y,x * y);
Console.WriteLine("The division of Two Numbers given is", x,y,x / y);
Console.ReadKey();

我已经构建了一个类和配置文件的jar文件.configuration.yml文件位于jar的根目录中.当我尝试使用以下命令运行应用程序时:

java -jar target/drop-wizard-0.0.1-SNAPSHOT.jar server configuration.yml

我在下面得到了例外.如何从命令提示符指定位于jar中的文件？

Exception in thread "main" java.io.FileNotFoundException: File configuration.yml not found <br>
    at io.dropwizard.configuration.FileConfigurationSourceProvider.open(FileConfigurationSourceProvider.java:14)<br>
    at io.dropwizard.configuration.ConfigurationFactory.build(ConfigurationFactory.java:75)<br>
    at io.dropwizard.cli.ConfiguredCommand.parseConfiguration(ConfiguredCommand.java:114)<br>
    at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:63)<br>
    at io.dropwizard.cli.Cli.run(Cli.java:70)<br>
    at io.dropwizard.Application.run(Application.java:72)<br>
    at com.flightnetwork.dropwizard.example.HelloWorldApplication.main(HelloWorldApplication.java:10)<br>

    Set set=new TreeSet();

    set.add(2);
    set.add(1);
    set.add("3");
    System.out.println(set);

Set是a Collection,它不是齐次的,所以它应该取任何值(Both Integer和String)

我在我的班级中加载我的春天语境如下:

public class Loader {
    public static void main(String args[]){
        final ConfigurableApplicationContext context =
            new FileSystemXmlApplicationContext(
                new String[] { serializationSpringContextPath }
            );

        System.out.println("main over");    
    }
}

主方法完成后的事件上下文仍然存在.垃圾收集器怎么没有收集它？