public class Book {
    String name;
    String auther;
    String publisher;
    String date;

    Book(String name,String auther,String publisher,String date){
        this.name=name;
        this.auther=auther;
        this.publisher=publisher;
        this.date=date;
    }

    public void setName(String name) {
        this.name = name;
    }
    public void setAuther(String auther) {
        this.auther = auther;
    }
    public void setPublish(String publish) {
        this.publisher = publish;
    }
    public void setDate(String date) {
        this.date = date;
    }

    public String getName() {
        return name;
    }
    public String getAuther() {
        return auther;
    }
    public String getPublish() {
        return publisher;
    }
    public String getDate() {
        return date;
    }

    public String toString() {                  //重写toString类
        return  name
               + "  " + auther
                +"  " + publisher
                +"  " + date;
    }

    public boolean equals(Object obj){
        if(this == obj)   //如果为同一对象的不同引用,则相同
            return true;
        if(obj == null)   // 如果传入的对象为空,则返回false
            return false;
        if(getClass()!=obj.getClass())   // 如果两者属于不同的类型,不能相等
            return false;
        if(obj instanceof Book){
            Book book = (Book)obj;
            if(book.name==this.name&&book.auther==this.auther
                    &&book.publisher==this.publisher&&book.date==this.date){
                return true;
            }
        }
        return false;
    }

    }