新手提问

Question

请各位帮忙解决，谢谢啦^^
代码如下：
public static void main(String[] args) {
System.out.println("Test tripleValue:");
double percent=10;
System.out.println("Before:percent="+percent);
tripleValue(percent);
System.out.println("After:percent="+percent);

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());

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());
// TODO Auto-generated method stub
}

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 od method:y="+y.getName());
}}class Employee
{
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;
}

private String name;
private double salary;
}
但编译时说Employee类出错
Description Resource Path Location Type
The type Employee is already defined ParamTest.java My project_1/src/cn/com/hao123 Unknown Java Problem
请各位帮我看下啦，谢谢

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【lc12_dd】截止到2008-08-02 09:14:54的历史汇总数据(不包括此帖)：
发帖的总数量:0                        发帖的总分数:0                        每贴平均分数:0                        
回帖的总数量:2                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:0                        结贴的总分数:0                        
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:0                        未结的总分数:0                        
结贴的百分比:---------------------结分的百分比:---------------------
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里：http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html
取消马甲机器人，请点这里：http://www.java2000.net/mycsdn/robotStop.jsp?usern=lc12_dd

Answer 2

public static void main(String[] args) {
System.out.println("Test tripleValue:");
double percent=10;
System.out.println("Before:percent="+percent);
tripleValue(percent);
System.out.println("After:percent="+percent);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());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());
// TODO Auto-generated method stub
}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 od method:y="+y.getName());
}} 这些根本没有放进类里

Answer 3

哦，已经定义了一个ParamTest类了

Answer 4

应该是这样...
public class ParamTest { /**
 * @param args
 */
public static void main(String[] args) {
System.out.println("Test tripleValue:");
double percent=10;
System.out.println("Before:percent="+percent);
tripleValue(percent);
System.out.println("After:percent="+percent);

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());

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());
// TODO Auto-generated method stub
}

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 od method:y="+y.getName());
}}class Employee
{
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;
}

private String name;
private double salary;
}
但是Employee类有问题，不是是不是要引用自定义类呢...

Answer 5

我这没有错啊
你的employee和paramTest是放在一个文件里面吗
我是的，然后直接编译ParamTest.java
ok,没有问题

Answer 6

输出结果
Test tripleValue:
Before:percent=10.0
End of method:x=30.0
After:percent=10.0Testing tripleSalary:
Before:salary=50000.0
End of method:salary=150000.0
After:salary:150000.0Testing swap:
Before:a=Alice
Before:b=Bob
End of method:x=Bob
End od method:y=Alice
After:a=Alice
After:b=Bob

Answer 7

是啊，我用eclipse编译，输出结果：
Exception in thread "main" java.lang.NoSuchMethodError: cn.com.hao123.Employee.raiseSalary(D)V
at cn.com.hao123.ParamTest.tripleSalary(ParamTest.java:40)
at cn.com.hao123.ParamTest.main(ParamTest.java:18)
Test tripleValue:
Before:percent=10.0
End of method:x=30.0
After:percent=10.0Testing tripleSalary:
Before:salary=50000.0