查找 Eclipse 编译的.class文件

问题：

我该如何只编译一个类？如何将其放入类文件（我已创建）中？Eclipse 不是在运行时自动编译所有类吗？

背景故事：

我正在学习一个教程，它告诉我：

将编译的类放入 WEB-INF/类中。

其中类是：

package org.odata4j.tomcat;
import java.util.Properties;
import org.core4j.Enumerable;
import org.core4j.Func;
import org.core4j.Funcs;
import org.odata4j.producer.ODataProducer;
import org.odata4j.producer.ODataProducerFactory;
import org.odata4j.producer.inmemory.InMemoryProducer;

public class ExampleProducerFactory implements ODataProducerFactory {

  @Override
  public ODataProducer create(Properties properties) {
    InMemoryProducer producer = new InMemoryProducer("example");

    // expose this jvm's thread information (Thread instances) as an entity-set called "Threads"
producer.register(Thread.class, Long.class, "Threads", new Func<Iterable<Thread>>() {
  public Iterable<Thread> apply() {
    ThreadGroup tg = Thread.currentThread().getThreadGroup();
    while (tg.getParent() != null)
      tg = tg.getParent();
    Thread[] threads = new Thread[1000];
    int count = tg.enumerate(threads, true);
    return Enumerable.create(threads).take(count);
  }
}, Funcs.method(Thread.class, Long.class, "getId"));

return producer;
  }
 }