4.5方法参数

来源：互联网发布：淘宝客怎么微信推广编辑：程序博客网时间：2024/05/29 18:59

java程序设计语言对对象的蚕蛹不是引用调用，实际上，对象引用进行的是值传递

java程序设计语言中方法参数的使用情况：

1.一个方法不能修改一个基本数据类型的参数。

2.一个方法可以改变一个对象参数的状态。

3.一个方法不能让对象参数引用一个新个的对象。

package com.qiao;public class Demo2 {public static void main(String[] args) {// TODO Auto-generated method stubSystem.out.println("Testing tripleValue:");double percent =10;System.out.println("Before :percent= "+percent);tripleValue(percent);System.out.println("After :percent="+percent);/*testing 2*/System.out.println("\nTesting tripleSalary:");Employee harry =new Employee("Harry", 50000);System.out.println("Before salary="+harry.getSalary());tripleSalary(harry);System.out.println("After:salary="+harry.getSalary());/*testing 3*/System.out.println("\nTesting 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 od 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;privatedouble 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) { salary += salary * byPercent/100; }}

0 0