java编写一个book类

下面是一个Java编写的Book类的示例：

public class Book {
    private String title;
    private String author;
    private int year;

    public Book(String title, String author, int year) {
        this.title = title;
        this.author = author;
        this.year = year;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public int getYear() {
        return year;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public void setYear(int year) {
        this.year = year;
    }

    @Override
    public String toString() {
        return title + " by " + author + ", published in " + year;
    }
}

这个类包含三个私有属性（书名、作者和出版年份）以及三个公有方法来获取或设置这些属性。toString() 方法被重载，以便在控制台上输出一个可读的字符串表示形式。在构造函数中初始化这些属性，并在需要时提供了 setter 和 getter 方法。