对象之间比较

class Book{
	private String title;
	private double price;

	public Book(String title, double price) {
		this.title = title;
		this.price = price;
	}
	//setter,getter略
	//本类接受自己的引用便于调用类中属性私有化操作
	//本类接受本类引用与当前对象比较
	public boolean compare(Book book) {
		//先对比较对象进行非空判断防止空指向异常
		if (book == null) {
			return false;
		}
		//再与当前对象比较内存地址，如相等就不用后续比较了
		if (this == book) {
			return true;
		}
		//再进行各自属性的比较
		if ((this.title).equals(book.title)
			 && (this.price == book.price)) {
			return true;
		} else {
			return false;
		}
	}
} 





public class TestDemo {
	public static void main(String[] args) 
	{
		Book ba = new Book("语文",10);
		Book bb = new Book("语文",10);
		if (ba.compare(bb)) {
			System.out.println("同一对象");
		} else {
			System.out.println("不同对象");
		}
		
	}

}