ParamTest

最新推荐文章于 2022-08-15 16:31:33 发布

weixin_30362083

最新推荐文章于 2022-08-15 16:31:33 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/guo-809264853/p/6247783.html

本文通过几个具体的Java示例，展示了基本类型和引用类型在方法调用中的传递方式及其影响。通过对double类型变量和Employee对象的salary属性进行操作，说明了值传递与引用传递的区别。

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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;
}
}