摘要:
/** * Returns the value to which the specified key is mapped, * or {@code null} if this map contains no mapping for the key. * * <p>More formally, if 阅读全文
摘要:
* *在定义类时,定义泛型 */public class People <T>{ private T name; private T age; public People(){ } public T getName() { return name; } public void setName(T n 阅读全文