instans运算

//Instanceof运算
public class InstanceofDome {
   
    public void show(Object obj){//可以传递任意类型参数
        
    }
    public static void main(String[] args) {
        String s="sdsd";
        if (s instanceof String) {
            System.out.println("s是String的实例");
        }else {
            System.out.println("No!");
        }
        String s1=new String("sdf");
        Object o=s;
        if (o instanceof String) {
            System.out.println("o是String的实例");
        }else {
            System.out.println("No!");
        }
        ArrayList arr=new ArrayList();
        arr.add(1);
        arr.add(true);
        arr.add("abc");
        arr.add(s1);
        
    }
}