java 面向对象之泛型以及泛型的构造方法设置多个泛型通配符

àì夳堔傛蜴生んèń 2022-06-15 06:55 181阅读 0赞

1 认识泛型：

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案例代码

package csdn.zyl.demo;  
class Point\{  
private Object x;  
private Object y;  
public Object getX() \{  
return x;  
\}  
public void setX(Object x) \{  
this.x = x;  
\}  
public Object getY() \{  
return y;  
\}  
public void setY(Object y) \{  
this.y = y;  
\}  
\}  
/\*  
\* 经纬度  
\* int  
\* float  
\* String 类型  
\*/  
public class GenericalDemo01 \{

public static void main(String\[\] args) \{  
// TODO Auto-generated method stub  
Point<String> point = new Point<String>();  
point.setX("精度为：109");  
point.setY("精度为：109");  
// Point p = new Point();  
// p.setX(10.1f);  
// p.setY(10.1f);  
// Float px = (Float)p.getX();  
// Float py = (Float)p.getY();  
System.out.println(point.getX()+" "+point.getY());  
  
\}

2 以及泛型的构造方法

![Center 1][]

代码案例如下：

package csdn.zyl.demo;  
class Con<T>\{  
private T value;  
public Con(T value)  
\{  
this.value = value;  
\}  
public T getValue() \{  
return value;  
\}  
public void setValue(T value) \{  
this.value = value;  
\}  
\}  
public class GenericDemo02 \{

public static void main(String\[\] args) \{  
// TODO Auto-generated method stub  
Con<String> con = new Con<String>("构造方法中使用泛型");  
System.out.println(con.getValue());  
\}

3 设置多个泛型：

package csdn.zyl.demo;  
/\*  
\* 指定多个泛型  
\*/  
class Gen<K,T>\{  
private T take;  
private K key;  
public T getTake() \{  
return take;  
\}  
public void setTake(T take) \{  
this.take = take;  
\}  
public K getKey() \{  
return key;  
\}  
public void setKey(K key) \{  
this.key = key;  
\}  
  
  
\}  
public class GenericalDemo04 \{  
public static void main(String\[\] args)  
\{  
Gen<String,Integer> gen = new Gen<String,Integer>();  
gen.setTake(10);  
gen.setKey("key");  
System.out.println(gen.getTake()+" "+gen.getKey());  
\}  
\}

案例结果：10 key  
4 通配符：

5 泛型接口

![Center 2][]

[Center]: /images/20220615/bae9b3a370d04b6696053cb9a1509933.png
[Center 1]: /images/20220615/ae0bd02c37624ef28bfb5ec1fd74423d.png
[Center 2]: /images/20220615/d55c452aa1bf4bfc8b00b936ecf9f971.png