java泛型、通配符、泛型数据和方法的用例代码

向右看齐 2022-07-16 02:17 132阅读 0赞

<pre style="font-family: 宋体; font-size: 9pt; background-color: rgb(255, 255, 255);"><pre name="code" class="java">import org.omg.CORBA.portable.UnknownException;
    import org.omg.IOP.Encoding;
    import org.omg.PortableInterceptor.INACTIVE;
    
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * Created by cuboo on 2016/9/28.
     */
    public class fanxing {
        public static void main(String agrs[]){
            fans<String> f = new fans<String>("100","200");
            System.out.println(f.getX()+"  "+f.getY());
    
            fans<Integer> f1 = new fans<Integer>(10,20);
            System.out.println(f1.getX()+"  "+f1.getY());
    
            fan1<String,Integer> f2 = new fan1<String,Integer>();
            f2.put("heo",100);
            System.out.println(f2.get("heo"));
    
            fans<Integer> f3 = new fans<Integer>(101,201);
            told(f3);
    
            fan fn = new fan();
            System.out.println(fn.fanl(156));
            System.out.println(fn.fanl("hello fan"));
            fn.fan1(new Integer[]{1,2,3,4});
            fn.fan1(new String[]{"h","e","l","l","o"});
        }
        //通配符？的使用
        public static void told(fans<?> f){
            System.out.println(f.getX()+"  "+f.getY());
        }
    
    
    
    
    }
    //泛型方法
    class fan{
        public  <T>T fanl(T str){
            return str;
        }
        //泛型数据
        public  <T>void fan1(T[] a){
                for(T i : a){
                System.out.println(i);
            }
        }
    }
    
    //泛型类<大写字母>一般写<T>
     class fans<B>{
        fans(B x,B y){   //构造方法中使用
            this.x = x;
            this.y = y;
        }
        private B x;
        private B y;
    
        public void setX(B x) {
            this.x = x;
    
        }
    
        public B getX() {
            return x;
        }
    
        public void setY(B y) {
            this.y = y;
        }
    
        public B getY() {
            return y;
        }
    }
    
    //多个泛型的类
    class fan1<K,V>{
        private K key;
        private V value;
    
        public void put(K key,V value){
            this.key = key;
            this.value = value;
        }
        public V get(K key) {
    
                if (this.key == key){
                    return value;
                }
          return null;
        }
    }