Java - Initialize List via declaration using constructors

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Description

Initialize List via declaration using constructors

Demo

import java.util.ArrayList;
import java.util.List;

public class SimpleMain01 {
  public static void main(String[] args) {
    show(new ArrayList<Integer>() {
      {/*from w  w  w  . j av  a 2 s.c  o  m*/
        add(10);
        add(20);
        add(30);
      }
    });
    show(new ArrayList<Double>() {
      {
        add(10.23);
        add(20.234);
        add(30.34);
      }
    });

  }

  // Any Class that extends Number class
  public static void show(List<? extends Number> lst) {
    for (Number n : lst)
      System.out.println(n);
  }
}

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