简单的自定义泛型类

1.自定义泛型类可以先定义一个正常的实体类，里面有对应的属性和方法，例如：

package com;

import java.util.ArrayList;
import java.util.List;

public class order {
	private String orderName;
	private int orderId;
	
	public String getOrderName() {
		return orderName;
	}
	public void setOrderName(String orderName) {
		this.orderName = orderName;
	}
	public int getOrderId() {
		return orderId;
	}
	public void setOrderId(int orderId) {
		this.orderId = orderId;
	}
	@Override
	public String toString() {
		return "order [orderId=" + orderId + ", orderName=" + orderName + "]";
	}	
}

2.然后在属性中加入你想要加入的属性，并在类声明的地方加入有泛型的声明，例如：

package com;

import java.util.ArrayList;
import java.util.List;

//自定义泛型类
public class order<T> {
	private String orderName;
	private int orderId;
	private T t;
	List<T> list = new ArrayList<T>();
	public void add(){
		list.add(t);
	}
	public T getT(){
		return t;
	}
	public void setT(T t){
		this.t = t;
	}
	public String getOrderName() {
		return orderName;
	}
	public void setOrderName(String orderName) {
		this.orderName = orderName;
	}
	public int getOrderId() {
		return orderId;
	}
	public void setOrderId(int orderId) {
		this.orderId = orderId;
	}
	@Override
	public String toString() {
		return "order [orderId=" + orderId + ", orderName=" + orderName
				+ ", t=" + t + "]";
	}
	
	
}

3.关于泛型的使用，可以使用下面的方法：

package com;

import java.util.List;

//自定义泛型类的使用
public class testOrder {
	public static void main(String[] args) {
		order<Boolean> Order =  new order<Boolean>();
		Order.setT(true);
		System.out.println(Order.getT()+"===OTHER==="+Order.getOrderName());
		Order.add();
		Order.add();
		Order.add();
		List<Boolean> list = Order.list;
		System.out.println(list);
		System.out.println(Order.toString());
	}
}

4.控制台的输出为：

true===OTHER===null
[true, true, true]
order [orderId=0, orderName=null, t=true]

5.如果比较复杂的，例如多参的

package com;

public class Pair<T> {
	private T first;
	private T last;

	public T getFirst() {
		return first;
	}

	public void setFirst(T first) {
		this.first = first;
	}

	public T getLast() {
		return last;
	}

	public void setLast(T last) {
		this.last = last;
	}

	public Pair(T first, T last) {
		super();
		this.first = first;
		this.last = last;
	}
}

6.一些疑问

7.当然泛型还可以定义多种类型
例如：

package com;

public class Pair<T,K> {
	private T first;
	private K last;

	public T getFirst() {
		return first;
	}

	public void setFirst(T first) {
		this.first = first;
	}

	public K getLast() {
		return last;
	}

	public void setLast(K last) {
		this.last = last;
	}

	public Pair(T first, K last) {
		super();
		this.first = first;
		this.last = last;
	}
}

8.还可以调用静态方法来进行创建下详见：
点我
9.拓展见：
拓展