编辑代码

package jihe;

public class Student {
	private int stuId;
	private String name;
	private double score;
	
	public Student(int stuId, String name, double score) {
		super();
		this.stuId = stuId;
		this.name = name;
		this.score = score;
	}
	
	public Student() {
		super();
	}
	
	public int getStuId() {
		return stuId;
	}
	public void setStuId(int stuId) {
		this.stuId = stuId;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public double getScore() {
		return score;
	}
	public void setScore(double score) {
		this.score = score;
	}

	@Override
	public String toString() {
		return "[学号：" + stuId + ", 姓名：" + name + ", 成绩：" + score + "]";
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((name == null) ? 0 : name.hashCode());
		long temp;
		temp = Double.doubleToLongBits(score);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		result = prime * result + stuId;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (!(obj instanceof Student)) {
			return false;
		}
		Student other = (Student) obj;
		if (name == null) {
			if (other.name != null) {
				return false;
			}
		} else if (!name.equals(other.name)) {
			return false;
		}
		if (Double.doubleToLongBits(score) != Double.doubleToLongBits(other.score)) {
			return false;
		}
		if (stuId != other.stuId) {
			return false;
		}
		return true;
	}

}



public class StudentTest {
    public static void main(String[] args) {
		//定义三个Student类的对象及一个HashSet类的对象
		Student stu1 = new Student(3, "William", 65);
		Student stu2 = new Student(1, "Tom", 87);
		Student stu3 = new Student(2, "Lucy", 95);
		Set<Student> stu = new HashSet<>();
		//将Student类的对象添加到集合中
		stu.add(stu1);
		stu.add(stu2);
		stu.add(stu3);
		//使用迭代器显示Student类的对象中的内容
		Iterator<Student> it = stu.iterator();
		while (it.hasNext()) {
			System.out.println(it.next());
		}
		System.out.println("=========================");
		//添加一个重复数据到Set中，观察输出结果
		Student stu4 = new Student(2, "Lucy", 55);
		stu.add(stu4);
		Iterator<Student> it2 = stu.iterator();
		while (it2.hasNext()) {
			System.out.println(it2.next());
		}
}