泛型的使用

class Point<T>{
private T var;
public T getVar(){
return var;
}
public void setVar(T var){
this.var = var;
}
}


public class Test {


public static void main(String[] args) {


Point<Integer> p = new Point<Integer>();
p.setVar(30);
System.out.println(p.getVar()*2);
}


}