ParamTest

package fourth;

public class ParamTest {

public static void main(String[] args) {
// TODO Auto-generated method stub
//can't modify
System.out.println("Test tripleValue:");
double percent = 10;
System.out.println("Before percent:"+percent);
tripleValue(percent);
System.out.println("After percent:"+percent);

//can change
System.out.println("\n Testing tripleSalary:");
Employee harry = new Employee("Harry",50000);
System.out.println("Before :salary"+harry.getSalary());
tripleSalary(harry);
System.out.println("After :salary= "+harry.getSalary());

//cant attach new object
System.out.println("\nTesting swap");
Employee a = new Employee("Alice",7000);
Employee b = new Employee("Bob",6000);
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=x*3;
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);
System.out.println("end of method y="+y);

}
}
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;
}
}