public class Temp { public static void main(String[] args) { //栈 Mystack ms=new Mystack(); ms.push("a"); ms.push("b"); ms.push("c"); ms.push("d"); ms.push("e"); for (int i = 0; i < 5; i++) { System.out.println(ms.prop()); } /** * 泛型 * 泛型类 泛型接口 泛型方法 泛型的属性 * 泛型的属性 属性的数据类型由调用方来决定当前数据类型 * Integer是int数据类型的封装类 * Character是char类型的封装类 * 必定只能是类 而不是基础数据类型的关键字 * 方便扩展 */ Person<String, Integer, Character> p=new Person<>(); p.setPname("张三"); p.setPage(18); p.setPsex('男'); //泛型的方法 PersonWethod<String> pm=new PersonWethod<>(); pm.getValue("张三"); //引用类型 可以new //装箱 值类型 到引用类型 int i=10; Object object=i; System.out.println(object); //拆箱 应用类型 到值类型 Object o=10; int j=(int)o; System.out.println(j); } }
import java.util.ArrayList; import java.util.LinkedList; public class Mystack { // ArrayList arr=new ArrayList(); // public void push(Object object) { // arr.add(0, "e"); // } // // public Object prop() { // //取第一个元素 // Object o=arr.get(0); // arr.remove(0); // return o; // } LinkedList arr=new LinkedList(); public void push(Object object) { arr.addFirst(object); } public Object prop() { Object o=arr.getFirst(); arr.removeFirst(); return o; } }
import java.util.List; public interface IBaseFace<E> { /** * 增加的公共方法 * @param elenment * @return */ public int addObject(E elenment); /** * 编辑 * @param elenment * @return */ public int editObject(E elenment); /** * 删除 * @param elenment * @return */ public int removeObject(E elenment); /** * 查询单个对象的方法 * @param elenment * @return */ public E queryObject(E elenment); /** * 查询多个对象的方法 * @param elenment * @return */ public List<E> queryObjects(E elenment); /** * 查询并分页 * @param elenment * @return */ public List<E> queryObjectPage(E elenment); }
public interface IPersonFace extends IBaseFace<Person<String,Integer,String>>{ public boolean queryUser(String uname); }
public class Person<A,B,C> { private A pname; private B page; private C psex; public A getPname() { return pname; } public void setPname(A pname) { this.pname = pname; } public B getPage() { return page; } public void setPage(B page) { this.page = page; } public C getPsex() { return psex; } public void setPsex(C psex) { this.psex = psex; } }
import java.util.List; public class PersonImpl implements IPersonFace{ @Override public int addObject(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return 0; } @Override public int editObject(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return 0; } @Override public int removeObject(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return 0; } @Override public Person<String, Integer, String> queryObject(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return null; } @Override public List<Person<String, Integer, String>> queryObjects(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return null; } @Override public List<Person<String, Integer, String>> queryObjectPage(Person<String, Integer, String> elenment) { // TODO Auto-generated method stub return null; } @Override public boolean queryUser(String uname) { // TODO Auto-generated method stub return false; } }
public class PersonWethod <E>{ public E getValue(E elenment) { if(elenment!=null) { return elenment; } return null; } }