package com.zetcode; import java.util.StringJoiner; public class Cat { private String name; private Integer age; public Cat(String name, Integer age) { this.name = name; this.age = age; } @Override public String toString() { return new StringJoiner(", ", Cat.class.getSimpleName() + "[", "]") .add("name='" + name + "'") .add("age=" + age) .toString(); } }