import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
public class Main {
	public static void main(String args[]) {
		List<int[]> outputList = new ArrayList<>();
		int[] result = new int[] { 0, 1 };
		int[] result2 = new int[] { 2, 3 };
		outputList.add(result);
		outputList.add(result2);
 
		System.out.println(
				Arrays.deepToString(outputList.toArray()).replaceAll("(?<=^)\\[", "{").replaceAll("\\](?=$)", "}"));
 
		System.out.println(Arrays.deepToString(outputList.toArray()).replaceAll("(?<=^)\\[", "{")
				.replaceAll("\\](?=$)", "}").replace(" ", ""));
	}
}

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