Java Generic type identification -

this class structure.

public class node<t> {     private t value;      public node(t val) {         this.value = val;     }      public t evaluate() {          return value;     };  } 

t can integer, double, date, long or string.

now, there anyway can know type t is? thanks.

you can invoke getclass() method on generic variable , find out class. generics erased @ run-time, unbounded generic nothing java.lang.object. can invoke method supported object class on generic variable

at run-time, getclass() on generic object return actual class used substitute generic

for example

public class node<t> {     private t value;      public node(t val) {         class<?> clazz = val.getclass();         checktype(clazz);         this.value = val;     }      public t evaluate() {          return value;     };      private void checktype(class<?> c) {        if(c.getname().equals(integer.class.getname())) {         //...        }     }  }