JAVA: java.lang.NumberFormatException: For input string: "[123, 456]"

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Java

Somebody please help me about this case. i got java error like the title when i try run this code:

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

public class test {

	static List<String> skill = new ArrayList<String>();//this must be String
	
	public static void main(String[] args) {
		skill.add("1:123 456");//input value cannot change
		System.out.println(getSkills());
	}
	
	public static List<StigmaSkill> getSkills() {
		List<StigmaSkill> list = new ArrayList<StigmaSkill>();
		
		for (String st : skill) {
			String[] array = st.split(":");
			int aInt = Integer.parseInt(Arrays.deepToString(array[1].split("\\s+")));
			list.add(new StigmaSkill(aInt));
		}
		return list;//return from string to integer value
	}
	
	private static class StigmaSkill {
		
		private int skillId;
		
		public StigmaSkill(int skillId) {
			this.skillId = skillId;
		}

		public int getSkillId() {
			return this.skillId;
		}
	}
}

Please help me figure out and solve my problem. thanks in advance