一個關於靜態函數的簡單例子

public class StaticTest
{
public static void main(String[] args)
{
// fill the staff array with three Employee objects
Employee[] staff = new Employee[3];

staff[0] = new Employee("Tom", 40000);
staff[1] = new Employee("Dick", 60000);
staff[2] = new Employee("Harry", 65000);

// print out information about all Employee objects
for (Employee e : staff)
{
e.setId();
System.out.println("name=" + e.getName() + ",id=" + e.getId() + ",salary="
+ e.getSalary());
}

int n = Employee.getNextId(); // calls static method
System.out.println("Next available id=" + 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; // set id to next available id
nextId++;
}

public static int getNextId()
{
return nextId; // returns static field
}

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

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