generics

import java.util.Arrays;

public class main< T extends Number> {

private Object[] data;
private static int DEFAULT_SIZE=10;
private int size=0;

public main(){
    this.data=new Object[DEFAULT_SIZE];
}
public void getList(main<? extends Number> list){
    //if(<Number>){then you can pass  number type only}
    //if(<? extends Number>){then you can pass  number and it's subclass  type too }
}
public void add(T num){
    if(isFull()){
        reSize();
    }
    data[size++]=num;

}
private boolean isFull(){
    return size==data.length;
}
public int size(){
    return size;
}
public T remove(int index){
    T removed=(T)(data[--size]);
    return removed;
}
  public void reSize(){
    Object[] temp=new Object[data.length*2];

    for(int i=0;i<data.length;i++){
        temp[i]=data[i];

    }
    this.data=temp;
  }
  public void set(int index,T value){
    data[index]=value;
  }
  public void isEmpty(){
    if(size==0){
        System.out.println("true");
    }
    else{
        System.out.println("false");
    }
  }
public T get(int index){
    return (T)(data[index]);

}
@Override
public String toString(){
    return Arrays.toString(data);
}

    public static void main(String[] args) {






}




}