java 收藏についてHashSetSample1

Posted 2021-05-08

class Foo1 {
	private String str;

	public Foo1(String str) {
		this.str = str;
	}

	public String toString() {
		return str + " ";
	}
}

class HashSetSample1 {
	public static void main(String[] args) {
		HashSet<Foo1> set = new HashSet<Foo1>();
		Foo1 f1 = new Foo1("AAA");
		set.add(f1);
		Foo1 f2 = new Foo1("BBB");
		set.add(f2);
		Foo1 f3 = new Foo1("CCC");
		set.add(f3);
		Foo1 f4 = new Foo1("AAA");
		set.add(f4);
		System.out.println("size : " + set.size());
		for (Foo1 f : set) {
			System.out.print(f);
		}
	}
}