import java.util.HashMap;
import java.util.Map;
import java.util.Set;
 
public class 泛型Demo {
    public static void main(String[] args) {
        //創(chuàng)建一個(gè)對象
        Map map=new HashMap();
        //添加數(shù)據(jù)
        map.put(1, "張三");
        map.put(2, "李四");
        map.put(3,"王五");
        map.put(5, 6);//加了不一樣的類型數(shù)據(jù)
 
        //鍵的集合
        Set keySet=map.keySet();
        //鍵找值
        for(Object key: keySet){
            String value=(String)map.get(key);
            System.out.println(key+":"+value);
        }
 
 
    }
}

        //鍵的集合
        Set keySet=map.keySet();
        //鍵找值
        for(Object key: keySet){
           Object value=map.get(key);
          //  String value=(String)map.get(key);
            System.out.println(key+":"+value);
        }

public class Generic<T>{}

public class Generic<T> {
    //定義一個(gè)變量，提供get set方法
    private T t;
    public T getT(){
        return t;
    }
    public void SetT(T t){
        this.t=t;
    }
    
}

public class GenericDemo {
    public static void main(String[] args) {
        Generic<String> g1=new Generic<>();
        g1.SetT("章三");
        System.out.println(g1.getT());
        System.out.println("------------------");
        Generic<Integer> g2=new Generic<>();
        g2.SetT(100);
        System.out.println(g2.getT());
    }
}

public <T> void show (T t){}

 
public class Generic {
public <T> void show(T t){
    System.out.println(t);
}
}

public class GenericDemo {
    public static void main(String[] args) {
       Generic g=new Generic();
       g.show("張三");
       g.show(100);
       g.show(true);
   g.show(null);
    }
}

public interface Generic<T>{}

public interface Generic<T>{}

public class GenricImp<T> Generic<T>{
   public void show(T t){
     System.out.println(t);   
   }
  
}

public class GenricDemo{
   public static void main(String[]args){
        Generic<String> g1=new GenericImp<String>();
       g1.show("張三");
   Generic<Integer> g2=new GenericImp<Integer>();
       g2.show(100);
   }
}