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                >[success] # javaBean * JavaBean是一種Java語言寫成的可重用組件,其它Java 類可以通過反射機 制發現和操作這些JavaBean 的屬性。 * JavaBean本質上就是符合以下標準的Java類: * * 類是公共的 * * 有一個無參的公共的構造器 * * 有屬性,且有對應的get、set方法 ~~~ public class Student { // 變成私有變量 private int age; private String name; private int id; // 構造方法 Student(int id, int age, String name) { // 在構造方法中調用set方法進行合理值的判斷 setAge(age); setId(id); setName(name); } // 符合javaBean 無參的構造函數 Student() { } // set 賦值 public void setId(int id) { // 做了封裝后可以給變量做合理值判斷 if (id > 0) { this.id = id; } else { System.out.println("學號必須大于0"); } } // get 獲取 public int getId() { return id; } public void setAge(int age) { if (age > 0) { this.age = age; } else { System.out.println("年齡必須大于0"); } } public int age() { return age; } public void setName(String name) { this.name = name; } public String getName() { return name; } // 展示個人信息 public void showInfo() { System.out.println(id + ":" + name + age); } } ~~~
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