javz笔记之：有趣的静态方法的使用

publicclasswelcome{

   publicstaticvoidmain(String[]args)
      {
         /*
          *Test1:Methodscan"tmodifynumericparameters
          */
         System.out.println("TestingtripleValue:");
         doublepercent=10;
         System.out.println("Before:percent="+percent);
         percent=tripleValue(percent);
         System.out.println("After:percent="+percent); //这里输出为30了！正常的结果

         /*
          *Test2:Methodscanchangethestateofobjectparameters
          */
         System.out.println("\nTestingtripleSalary:");
         Employeeharry=newEmployee("Harry",50000);
         System.out.println("Before:salary="+harry.getSalary());
         tripleSalary(harry);
         System.out.println("After:salary="+harry.getSalary());

         /*
          *Test3:Methodscan"tattachnewobjectstoobjectparameters
          */
         System.out.println("\nTestingswap:");
         Employeea=newEmployee("Alice",70000);
         Employeeb=newEmployee("Bob",60000);
         System.out.println("Before:a ="+a.getName());
         System.out.println("Before:b ="+b.getName());
         swap(a,b);
         System.out.println("After:a="+a.getName());
         System.out.println("After:b="+b.getName());
      }

      publicstaticdoubletripleValue(doublex)//doesn"twork
      {
         returnx=3*x;
         //System.out.println("Endofmethod:x="+x);
      }

      publicstaticvoidtripleSalary(Employeex)//works
      {
         x.raiseSalary(200);
         System.out.println("Endofmethod:salary="+x.getSalary());
      }

      publicstaticvoidswap(Employeex,Employeey)
      {
         Employeetemp=x;
         x=y;
         y=temp;
         System.out.println("Endofmethod:x="+x.getName());
         System.out.println("Endofmethod:y="+y.getName());
      }
   }

   classEmployee//simplifiedEmployeeclass
   {
      publicEmployee(Stringn,doubles)
      {
         name=n;
         salary=s;
      }

      publicStringgetName()
      {
         returnname;
      }

      publicdoublegetSalary()
      {
         returnsalary;
      }

      publicvoidraiseSalary(doublebyPercent)
      {
         doubleraise=salary*byPercent/100;
         salary+=raise;
      }

      privateStringname;
      privatedoublesalary;
   }