statictest.java

《JAVA程序设计教程》源代码

//StaticTest.java

public class StaticTest
{
   public static void main(String[] args)
   {
                                    
      Employee[] staff = new Employee[3];// 输入三个员工的信息到职工数组

      staff[0] = new Employee("张三", 40000);
      staff[1] = new Employee("李四", 60000);
      staff[2] = new Employee("王五", 65000);
                                                 
      for (int i = 0; i < staff.length; i++)// 打印输出所有员工的信息
      {
         Employee e = staff[i];
         e.setId();
         System.out.println("姓名=" + e.getName()+ ",编号=" 
                            + e.getId()+ ",工资=" + e.getSalary());
      }

      int n = Employee.getNextId();// 调用静态方法                    
      System.out.println("下一个有效编号=" + n);
   }
}

class Employee
{
   public Employee(String n, double s)
   {
      name = n;
      salary = s;
      id = 0;
   }

   public String getName()
   {
      return name;
   }

   public double getSalary()
   {
      return salary;
   }

   public int getId()
   {
      return id;
   }

   public void setId()
   {
      id = nextId;// 设置职工编号到下一个有效编号                         
      nextId++;
   }

   public static int getNextId()
   {
      return nextId;//返回静态存储空间                       
   }

   public static void main(String[] args)       // 单元测试
   {
      Employee e = new Employee("张三", 50000);
      System.out.println(e.getName() + " " + e.getSalary());
   }

   private String name;
   private double salary;
   private int id;
   private static int nextId = 1;
}