方法参数

public class ParamTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        System.out.println("Testing tripleValue:");
        double percent = 10;
        System.out.println("Before:percent:"+percent);
        tripleValue(percent);
        System.out.println("After:percent="+percent);
        
        
        System.out.println("
Testing tripSalary");
        Employee harry = new Employee("Harry",50000);
        System.out.println("Before: salary=" + harry.getSalary());
        tripleSalary(harry);
        System.out.println("After: salary=" + harry.getSalary());
        
        System.out.println("
Testing swap:");
        Employee a = new Employee("Alice", 70000);
        Employee b = new Employee("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());
    }
        public static void tripleValue(double x) {
            x = 3*x;
            System.out.println("End of method: x="+x);            
        }
        
        public static void tripleSalary(Employee x) {
            x.raiseSalary(200);
            System.out.println("End of method: salary =" + x.getSalary());
        }
        
        public static void swap(Employee x, Employee y) {
            Employee temp = x;
            x = y;
            y = temp;
            System.out.println("End of method: x=" + x.getName());
            System.out.println("End of method: y=" + y.getName());
        }
    }
    
    
    
    class Employee {
        private String name;
        private double salary;
        
        public Employee(String n, double s) {
            name = n;
            salary = s;
        }
        
        public String getName() {
            return name;
        }
        
        public double getSalary() {
            return salary;
        }
        
        public void raiseSalary(double byPercent) {
            double raise = salary * byPercent / 100;
            salary += raise;
        }
    

}