第三章

package edu.xcdq;
/*
类的封装
1 成员变量必须私有化 private修饰
2 使用getter setter 提供对外的访问方式
*/

public class Demo {
private String name;
private int age;

//设置值  setter
public void setName(String name) {
    this.name = name;
}

//获取值  getter
public String getName() {
    return this.name;
}

public void setAge(int age) {
    this.age = age;
}

public int getAge() {
    return this.age;
}

}
测试
package edu.xcdq;

public class testDemo {
public static void main(String[] args) {
/Demo demo = new Demo();
demo.name = "小明";
demo.age = 99 ;
System.out.println(demo.name);
System.out.println(demo.age);/

    Demo demo = new Demo();
    demo.setName("小明");
    demo.setAge(19);
    System.out.println(demo.getName());
    System.out.println(demo.getAge());
}

}