java如何引用传递 java引用传递的例子

引用传递是JAVA中最为核心的内容，也是实际开发中常见的一种操作

 JAVA引用传递应用案例（简单demo）

/*
	*创建people类，存储个人信息
	*一个人可以拥有一本书，定义Book引用类型
*/
class People{
	private String name;
	private int id;
	private Book book;
	public People(String name, int id) {
		this.name = name;
		this.id = id;
	}
	public String getInfo() {
		return "姓名：" + this.name + " 身份证：" + this.id;
	}
	public void setBook(Book book) {
		this.book = book;
	}
	public Book getBook() {
		return this.book;
	}
}

/*
	*创建Book类，存储书籍信息
	*每本书可以被一个人拥有，定义People引用类型
*/
class Book{
	private String name;
	private double price;
	private String author;
	private People peo;
	public Book(String name, double price, String author) {
		this.name = name;
		this.price = price;
		this.author = author;
	}
	public String getInfo() {
		return "书名：" + this.name + " 价格：" + this.price + " 作者：" + this.author;
	}
	public void setPeo(People peo) {
		this.peo = peo;
	}
	public People getPeo() {
		return this.peo;
	}
}

 程序主函数

public class javaDemo {
	public static void main(String[] args) {
		//声明对象初始化并建立关联
		People people = new People("李明", 1027);
		Book book = new Book("三体", 35.8, "刘慈欣");
		people.setBook(book);
		book.setPeo(people);
		//根据关系获取数据
		System.out.println(people.getBook().getInfo());
		System.out.println(book.getPeo().getInfo());
	}
}

 System.out.println(people.getBook().getInfo());
 people.getBook().getInfo() 该写法为代码链形式，写法等价于

// 相对于代码链来说，该方法较为繁琐
	Book temp = people.getBook();
	System.out.println(temp.getInfo());

 所有代码复制到一个.java文件中，编译运行即可