64 lines
1.4 KiB
Java
64 lines
1.4 KiB
Java
package chapter3;
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class Book {
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int id; // 编号
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String name; // 书名
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// public Book() {
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// this.id = 0;
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// this.name = "未命名";
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// System.out.println("初始化：无参构造被调用！");
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// }
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// public Book(int id, String name) {
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// this.id = id;
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// }
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// 打印信息
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public void print() {
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System.out.println("print函数 - ID：" + this.id + "，书名：" + this.name);
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}
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// 获取书号
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public int getId() {
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return id;
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}
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// 设置书号
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public void setId(int id) {
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this.id = id;
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}
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// 获取书名
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public String getName() {
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return name;
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}
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// 设置书名
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public void setName(String name) {
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this.name = name;
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}
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public static void main(String[] args) {
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Book[] books = new Book[10];
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// 使用 setter 初始化
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books[0] = new Book();
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books[0].print();
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System.out.println("初始化：手动");
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books[0].setId(1);
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books[0].setName("Java教程");
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books[0].print();
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System.out.println("============");
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// 直接访问属性进行初始化（注意访问控制）
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books[1] = new Book();
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books[1].print();
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System.out.println("初始化：手动");
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books[1].id = 2;
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books[1].name = "JSP教程";
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books[1].print();
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}
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}
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