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标题: 缓存实例的不可改变类 [打印本页]

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作者: 莫名12301    时间: 2015-7-10 09:25
标题: 缓存实例的不可改变类
class CacheImmutale
{
private static int MAX_SIZE = 10;
private static CacheImmutale[] cache = new CacheImmutale[MAX_SIZE];
private static int pos = 0;
private final String name;
private CacheImmutale(String name)
{
  this. name = name;
}
public String getName()
{
  return name;
}
public static CacheImmutale valueOf(String name)
{
  for(int i = 0; i < MAX_SIZE; ++i)
  {
   if(cache[i] != null && cache[i].getName().equals(name))
    return cache[i];
  }
  if(pos == MAX_SIZE)
  {
   cache[0] = new CacheImmutale(name);
   pos = 1;
  }
  else
  {
   cache[pos++] = new CacheImmutale(name);
  }
  return cache[pos -1];
}

public boolean equals(Object obj)
{
  if(this == obj)
   return true;
  if(obj != null && obj.getClass() == CacheImmutale.class)
  {
   CacheImmutale ci = (CacheImmutale)obj;
   return name.equals(ci.getName());
  }
  return false;
}
public int hashCode()
{
  return name.hashCode();
}
}

public class CacheImmuteTest
{
public static void main(String[] args)
{
  CacheImmutale c1 = CacheImmutale.valueOf("Hello");
  CacheImmutale c2 = CacheImmutale.valueOf("Hello");
  System.out.println(c1 == c2);
}
}

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