add new files

Employee.java

@@ -0,0 +1,51 @@
+package com.powernode.spring6;
+
+public class Employee {
+    private int id;
+    private String name;
+    private int level;
+    private Boolean isBoss;
+
+    private Employee(int id, String name, int level, Boolean isBoss) {
+        this.id = id;
+        this.name = name;
+        this.level = level;
+        this.isBoss = isBoss;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getLevel() {
+        return level;
+    }
+
+    public Boolean getBoss() {
+        return isBoss;
+    }
+
+    public void setBoss(Boolean boss) {
+        if( boss && level > 25) {
+            isBoss = boss;
+        } else if (!boss && level < 25) {
+            isBoss = boss;
+        } else {
+            System.out.println("boss can only be person who level is higher than 25");
+        }
+    }
+
+    public static Employee staticTest(int id, String name, int level) {
+        return new Employee(id, name, level, level > 25);
+    }
+
+
+    public static void main(String[] args) {
+        Employee employee = Employee.staticTest(1,"Dan",27);
+        System.out.println(employee.isBoss);
+    }
+}

HelloWorld.java

@@ -1,5 +1,6 @@
  public class HelloWorld {
      public static void main(String[] args) {
-         System.out.println("Hello tian!!!");
+         System.out.println("笑笑笑笑笑笑笑笑笑");
+         System.out.println("Hello, World");
      }
  }

LeapYear.java

@@ -0,0 +1,57 @@
+/** Class that determines whether or not a year is a leap year.
+ *  @author YOUR NAME HERE
+ */
+public class LeapYear {
+
+    /** Calls isLeapYear to print correct statement.
+     *  @param  year to be analyzed
+     */
+    private static void checkLeapYear(int year) {
+        if (isLeapYear(year)) {
+            System.out.printf("%d is a leap year.\n", year);
+        } else {
+            System.out.printf("%d is not a leap year.\n", year);
+        }
+    }
+
+    /**
+     * Method check if year is leap
+     */
+    public static boolean isLeapYear(int year) {
+        if (year % 400 == 0) {
+            return true;
+        } else if (year % 100 != 0 && year % 4 == 0) {
+            return true;
+        } else {
+            return false; 
+        }
+
+    }
+
+    public static void countDaysInYear(int year) {
+        if (isLeapYear(year)) {
+            System.out.println("366 days");
+        } else {
+            System.out.println("365 days");
+        }
+    }
+
+
+    /** Must be provided an integer as a command line argument ARGS. */
+    public static void main(String[] args) {
+        if (args.length < 1) {
+            System.out.println("Please enter command line arguments.");
+            System.out.println("e.g. java Year 2000");
+            System.out.println("aaa 2000 cccc");
+        }
+        for (int i = 0; i < args.length; i++) {
+            try {
+                int year = Integer.parseInt(args[i]);
+                checkLeapYear(year);
+                countDaysInYear(year);
+            } catch (NumberFormatException e) {
+                System.out.printf("%s is not a valid number.\n", args[i]);
+            }
+        }
+    }
+}

Test.java

@@ -0,0 +1,8 @@
+package com.powernode.spring6;
+
+public class Test {
+    public static void main(String[] args) {
+        Employee bruce = Employee.staticTest(2,"bulusi",24);
+        bruce.setBoss(true);
+    }
+}