class GenericFoo<___（1）_____>{private T foo;public void setFoo( T f){foo=f;}public T getFoo( ){return foo;} public static void main(String[] args) {GenericFoo< ___（2）_____> foo=new GenericFoo<___（2）_____> ();foo.setFoo( 2 );System.out.println("整数值为："+ foo. ___（3）_____); }}