静态方法

Author: mthli

Part3/StaticTest.java

@@ -0,0 +1,61 @@
+public class StaticTest {
+ public static void main(String[] args) {
+ Employee[] staff = new Employee[3];
+ 
+ staff[0] = new Employee("Tom", 40000);
+ staff[1] = new Employee("Dick", 60000);
+ staff[2] = new Employee("Harry", 65000);
+
+ for (Employee e : staff) {
+ e.setId();
+ System.out.println(
+ "name = " + e.getName() +
+ ", id = " + e.getID() +
+ ", salary = " + e.getSalary()
+ );
+ }
+ int n = Employee.getNextId();
+ System.out.println("Next available id = " + n);
+ }
+}
+
+class Employee {
+ private static int nextId = 1;
+
+
+ private String name;
+ private double salary;
+ private int id;
+
+ 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;
+ nextId++;
+ }
+
+ public static int getNextId() {
+ return nextId;
+ }
+
+ public static void main(String[] args) {
+ Employee e = new Employee("Harry", 50000);
+ System.out.println(e.getName() + " " + e.getSalary());
+ }
+}