java中的泛型

class Point<T>{ //此处地T可以表示任意一个引用类型，在类实例化的时候进行定义
    private T x;
    private T y;
    public void setX(T x){
        this.x = x;
    }
    public void setY(T y){
        this.y = y;
    }
    public T getX(){
        return x;
    }
    public T getY(){
        return y;
    }
}
public class Test{
    public static void main(String args[]){
        Point<String> p = new Point<String>();//在类实例化的时候确定类型
        p.setX("java");
        p.setY("oracle");
        System.out.println(p.getX());
        System.out.println(p.getY());

    }
}

package com.javaxuexi.hu;
class Message<T>{
    private T msg;
    public void setMsg(T msg){
        this.msg = msg ;
    }
    public T getMsg(){
        return msg ;
    }
}
public class TestDemo{
    public static void main(String args[]){
        Message<String> msg = new Message<String>();
        msg.setMsg("java");
        print(msg);
    }
    public static void print(Message<?> temp){ //此时问好表示通配符
        System.out.println(temp.getMsg());
    }
}

package com.java.demo;
interface IMessage<T>{
    public void print(T t);
}
class MessageImpl<T> implements IMessage<T>{  //在子类上面继续设置泛型
    public void print(T t) {
        System.out.println(t);
        
    }
    
}
public class TestDemo{
    public static void main(String args[]){
        IMessage<String> mgs = new MessageImpl<String>();
        mgs.print("hello word");
    }
}

package com.java.demo;
interface IMessage<T>{
    public void print(T t);
}
class MessageImpl implements IMessage<String>{  //在子类上面继续设置泛型
    public void print(String t) {
        System.out.println(t);
        
    }
    
}
public class TestDemo{
    public static void main(String args[]){
        IMessage<String> mgs = new MessageImpl();
        mgs.print("hello word");
    }
}

package com.java.demo;
public class TestDemo{
    public static void main(String args[]){
        System.out.println(fun("hello word"));
    }
    public static <T> T fun(T t){//泛型方法的的返回值类型有传入参数类型决定
        return t;
    }
}