方法一:建立乙個顯式的工廠物件,獲得編譯檢查。
package com.cognizant.ch15;
inte***ce factoryi
class foo2
}class intege***ctory implements factoryi
}class widget }}
public class factoryconstraint
方法二:模版方法設計模式
package com.cognizant.ch15;
abstract class genericwithcreate
abstract t create();
}class x
class creator extends genericwithcreate
void f()
}public class creatorgenetic
}output:x
C 泛型型別 泛型方法
泛型會宣告型別引數 泛型的消費者需要提供型別引數來把佔位符型別填充 public class stack var stack newstack int stack.push 2 stack.push 3 int x stack.pop 2int y stack.pop 3stack open typ...
建立泛型陣列非法的原因
list stringlists new list 1 listintlist arrays.aslist 42 object objects stringlists objects 0 intlist string s stringlist 0 get 0 首先假設泛型陣列合法,則第一行不會出現編...
C 泛型 建立泛型類 例子
public class linkedlistnode public t value public linkedlistnodenext public linkedlistnodeprev public class linkedlist ienumberable public linkedlistn...