# TQC java 練習題
###### tags: `JAVA課堂學習` `複習用` `高科大` `證照考試`
## <font color="FFD306">💡</font>注意事項:
1. 通常**題組一**都會**改變題型**，不會和平常練習的參考答案一樣。
2. 答案沒有唯一解，但需要==依照題目敘述==，將程式碼製作出來。
## 題目102
:::spoiler {state="open"} **自行速解**
```java
import java.util.*;
public class JPA01
{
static Scanner kb=new Scanner(System.in);
public static void main(String args[])
{
double kgn=2.20462;
System.out.print("Please input: ");
double kg=kb.nextDouble();
System.out.printf("%.6f kg = %.6f ponds",kg,kg*kgn);
}
}
```
:::
## 題目108
:::success
```java=1
public static int add(int a,int b)
{
System.out.println("Adding two integers:"+a+","+b);
return a+b;
}
public static double add(double a,double b)
{
System.out.println("Adding two doubles:"+a+","+b);
return a+b;
}
public static String add(String a,String b)
{
System.out.println("Adding two Strings:"+a+","+b);
return a+b;
}
```
:::
:::spoiler {state="open"} **自行速解**
```java
class JPA01
{
public static int add(int a,int b)
{
System.out.println("Adding two integers:"+a+","+b);
return a+b;
}
public static double add(double a,double b)
{
System.out.println("Adding two doubles:"+a+","+b);
return a+b;
}
public static String add(String a,String b)
{
System.out.println("Adding two Strings:"+a+","+b);
return a+b;
}
public static void main (String[] args)
{
int i = add(2, 3);
double d = add(5.2, 4.3);
String s = add("I love ", "Java!!");
System.out.printf("%d %f %s \n", i, d, s);
}
}
```
:::
## 題目110
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA01
{
public static void main(String args[])
{
double totalarea;
System.out.printf("圓形面積為：%f \n",calCircle(5));
System.out.printf("三角形面積為：%f \n",calTriangle(10,5));
System.out.printf("方形面積為：%f \n",calRectangle(5,10));
totalarea = calCircle(5)+calTriangle(10,5)+calRectangle(5,10);
System.out.printf("此圖形面積為：%f \n",totalarea);
}
static double calCircle(int r)
{
double PI=3.1415926;
return Math.pow(r,2)*PI;
}
static double calTriangle(int b,int h)
{
return b*h/2.0;
}
static double calRectangle(int m,int n)
{
return (double)m*n;
}
}
```
:::
---
## 題目202
:::spoiler {state="open"} **自行速解**
```java
import java.util.*;
class JPA02
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args)
{
test();
test();
}
public static void test()
{
System.out.println("Input:");
int a=keyboard.nextInt();
int b=keyboard.nextInt();
if(a>b)
{
System.out.println(a+" is larger than "+b);
}
else
{
System.out.println(b+" is larger than "+a);
}
}
}
```
:::
## 題目206
:::spoiler {state="open"} **自行速解**
```java
import java.util.*;
public class JPA02
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args)
{
test();
test();
test();
test();
}
static void test()
{
int chi, eng, math, avg;
System.out.print("Input Chinese score:");
chi = keyboard.nextInt();
System.out.print("Input English score:");
eng = keyboard.nextInt();
System.out.print("Input Math score:");
math = keyboard.nextInt();
if(chi<60)
{
System.out.println("Chinese failed.");
}
if(eng<60)
{
System.out.println("English failed.");
}
if(math<60)
{
System.out.println("Math failed.");
}
if(chi>=60&&eng>=60&&math>=60)
{
System.out.println("All Pass.");
}
}
}
```
:::
## 題目208
:::spoiler {state="open"} **自行速解**
```java
import java.util.*;
class JPA02
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args)
{
test();
test();
test();
test();
test();
}
public static void test()
{
System.out.println("Input:");
int score=keyboard.nextInt();
if(score>=90)
{
System.out.println("Your grade is A.");
}
else
{
if(score>=80)
{
System.out.println("Your grade is B.");
}
else
{
if(score>=70)
{
System.out.println("Your grade is C.");
}
else
{
if(score>=60)
{
System.out.println("Your grade is D.");
}
else
{
System.out.println("Your grade is F.");
}
}
}
}
}
}
```
:::
---
## 題目304
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA03
{
static Scanner kb=new Scanner(System.in);
public static void main(String[] args)
{
int total = 0;
int s = 0;
int count = 0;
double average;
do
{
System.out.print("Please enter meal dollars or enter -1 to stop: ");
s=kb.nextInt();
if(s!=-1)
{
count++;
total+=s;
}
}while(s!=-1);
average=(double)total/count;
System.out.println("餐點總費用:"+total);
System.out.printf(" %d 道餐點平均費用為: %.2f",count,average);
}
}
```
:::
## 題目308
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA03
{
static Scanner keyboard = new Scanner(System.in);
static int i = -1;
public static void main(String[] args)
{
int total = 0, s = 0;
do
{
System.out.print("請輸入消費金額，或輸入-1結束:");
s=keyboard.nextInt();
if(s!=-1)
{
total+=s;
}
}while(s!=-1);
System.out.println("電腦週邊總費用："+total);
}
}
```
:::
## 題目310
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA03
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args)
{
int n;
do
{
System.out.print("請輸入n的值(n > 0，且為偶數):");
n=keyboard.nextInt();
}while(n<=0||n%2!=0);
int i=2,sum=0;
do
{
sum+=i;
i+=2;
}while(i<=n);
System.out.println("2+4+...+"+n+"="+sum);
}
}
```
:::
---
## 題目402
:::success
**main檔**
```java=1
FT(n,1)
F(n,1)
```
**尾端遞迴FT()**
```java=1
static int FT(int n,int r)
{
if(n==0)
{
return r;
}
else
{
return FT(n-1,r*n);
}
}
```
**迴圈F()**
```java=1
static int F(int n,int r)
{
if(n==0)
{
return 1;
}
else
{
for(int i=1;i<=n;i++)
{
r*=i;
}
return r;
}
}
```
:::
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA04
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String args[])
{
int n=0;
do
{
System.out.print("Input n(0 <= n <= 16):");
n=keyboard.nextInt();
if(n>=0&&n<=16)
{
System.out.println(n+" 的階乘(尾端遞迴) = "+FT(n,1));
System.out.println(n+" 的階乘(迴圈) = "+F(n,1));
}
}while(n!=999);
}
static int FT(int n,int r)
{
if(n==0)
{
return r;
}
else
{
return FT(n-1,r*n);
}
}
static int F(int n,int r)
{
if(n==0)
{
return 1;
}
else
{
for(int i=1;i<=n;i++)
{
r*=i;
}
return r;
}
}
}
```
:::
## 題目406
:::warning
**遞迴函式解法 countA()**
```java=1
public static int countA(String str)
{
if(str.equals(""))
{
return 0;
}
else
{
if(str.charAt(0)=='A')
{
return 1+countA(str.substring(1));
}
else
{
return countA(str.substring(1));
}
}
}
```
:::
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA04
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String args[])
{
for(int i=0;i<2;i++)
{
System.out.print("Input a string: ");
String s=keyboard.nextLine();
System.out.println(s+" has "+countA(s)+" As");
}
}
public static int countA(String str)
{
if(str.equals(""))
{
return 0;
}
else
{
if(str.charAt(0)=='A')
{
return 1+countA(str.substring(1));
}
else
{
return countA(str.substring(1));
}
}
}
}
```
:::
## 題目408
:::danger
**字串遞迴函式 reverse()**
```java=1
static String reverse(String str)
{
if(str.equals(""))
{
return "";
}
else
{
return reverse(str.substring(1))+str.substring(0,1);
}
}
```
:::
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA04
{
static Scanner keyboard = new Scanner(System.in);
public static void main(String args[])
{
String s, c;
System.out.print("Input a string: ");
s = keyboard.nextLine();
System.out.printf("%s\n", reverse(s));
System.out.print("Input a string: ");
s = keyboard.nextLine();
System.out.printf("%s\n", reverse(s));
}
static String reverse(String str)
{
if(str.equals(""))
{
return "";
}
else
{
return reverse(str.substring(1))+str.substring(0,1);
}
}
}
```
:::
---
## 題目504
:::spoiler {state="open"} **自行速解**
```java
import java.util.Scanner;
public class JPA05
{
public static Scanner keyboard = new Scanner(System.in);
public static void main(String[] argv)
{
int[] F=new int[10];
F[0]=0;
F[1]=1;
for(int i=2;i<F.length;i++)
{
F[i]=F[i-1]+F[i-2];
}
for(int i=0;i<F.length;i++)
{
System.out.println(F[i]);
}
}
}
```
:::
## 題目506
:::spoiler {state="open"} **自行速解**
```java
public class JPA05
{
public static void main(String[] argv)
{
int sum =0;
int A[][][] = {{{1,2,3},{4,5,6}},
{{7,8,9},{10,11,12}},
{{13,14,15},{16,17,18}},
{{19,20,21},{22,23,24}}};
for(int i=0;i<A.length;i++)
{
for(int j=0;j<A[i].length;j++)
{
for(int k=0;k<A[i][j].length;k++)
{
sum+=A[i][j][k];
}
}
}
System.out.printf("sum = %d\n", sum);
}
}
```
:::
## 題目508
:::spoiler {state="open"} **自行速解**
```java
public class JPA05
{
public static void main(String[] argv)
{
int[] data = {2, 4, 3, 5, 7, 6, 9, 1}; // 為排序的資料
int temp;
for(int i=0;i<data.length-1;i++)
{
for(int j=0;j<data.length-1;j++)
{
if(data[j]>data[j+1])
{
temp=data[j];
data[j]=data[j+1];
data[j+1]=temp;
}
}
for(int k=0;k<data.length;k++)
{
System.out.print(data[k]+" ");
}
System.out.println("");
}
}
}
```
:::
---
## 題目606
### 606_1
**執行結果**
:::warning
記得要<font color="#EA000">**繼承**</font>，`extends`常忘記打。
:::
==父class==
```java=1
class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
}
```
==子class==
1. FullTimeTeacher
```java=1
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
```
2. PartTimeTeacher
```java=1
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
```
:::spoiler **整合版**
```java
class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
}
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
```
:::
### 606_2
**執行結果**
:::danger
:warning: 注意!!!
<font color="EA000">父 class 的 **屬性** 必須 **先宣告**</font>
```java=1
class Manager extends FullTimeTeacher
{
int rank; //多一個宣告rank
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours); //父class的屬性必須先宣告
this.rank=rank; //子class多加的rank，才能宣告
}
double salary()
{
return super.salary()+rank*500; //salary()+rank*rate
}
double getTotalSalary()
{
return salary();
}
}
```
:::
==父class==
```java=1
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
}
```
==子class==
3. Manager
```java=1
class Manager extends FullTimeTeacher
{
int rank;
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours);
this.rank=rank;
}
double salary()
{
return super.salary()+rank*500; //salary()+rank*rate
}
double getTotalSalary()
{
return salary();
}
}
```
:::spoiler **整合版**
```java
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
}
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
class Manager extends FullTimeTeacher
{
int rank;
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours);
this.rank=rank;
}
double salary()
{
return super.salary()+rank*500;
}
double getTotalSalary()
{
return salary();
}
}
```
:::
### 606_3
**執行結果**
:::warning
**記得 main檔要打**
```java=1
am1.compare(f3);
p1.compare(f3);
```
:::
==父class==
```java=1
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
void compare(Teacher t)
{
if(this.salary()>t.salary())
{
System.out.println(this.name+" is higher than "+t.name);
}
else
{
System.out.println(t.name+" is higher than "+this.name);
}
}
}
```
:::spoiler **整合版**
```java
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
void compare(Teacher t)
{
if(this.salary()>t.salary())
{
System.out.println(this.name+" is higher than "+t.name);
}
else
{
System.out.println(t.name+" is higher than "+this.name);
}
}
}
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
class Manager extends FullTimeTeacher
{
int rank;
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours);
this.rank=rank;
}
double salary()
{
return super.salary()+rank*500;
}
double getTotalSalary()
{
return salary();
}
}
```
:::
### 606_4
**執行結果**
:::info
<font color="EA000">**易錯部分**</font>
1. `import java.util.*;`忘記打，因為要用HashMap函式，所以要記得。
2. class Manger的部分，要注意因為afterTaxlns，不是用繼承，而是使用泛型Teacher t，透過t.afterTaxIns()，t會隨main檔變化，舉例來說，當HashMap隨意抓到p1的值，要算出p1.afterTaxIns()，所以會隨著前面new過的值，開始跑父子class。
[參考資料: 一文搞懂泛型 | IT人](https://iter01.com/597570.html)
:::
==子class==
4. TeacherDB
```java=1
class TeacherDB
{
HashMap<String,Teacher> T =new HashMap<String,Teacher>();
void store(String name,Teacher t)
{
T.put(name,t);
}
double totalOfAll()
{
double sum=0;
for(Teacher t : T.values())
{
sum+=t.afterTaxIns();
}
return sum;
}
}
```
:::spoiler **整合版**
```java
import java.util.*;
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
void compare(Teacher t)
{
if(this.salary()>t.salary())
{
System.out.println(this.name+" is higher than "+t.name);
}
else
{
System.out.println(t.name+" is higher than "+this.name);
}
}
}
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
class Manager extends FullTimeTeacher
{
int rank;
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours);
this.rank=rank;
}
double salary()
{
return super.salary()+rank*500;
}
double getTotalSalary()
{
return salary();
}
}
class TeacherDB
{
HashMap<String,Teacher> T =new HashMap<String,Teacher>();
void store(String name,Teacher t)
{
T.put(name,t);
}
double totalOfAll()
{
double sum=0;
for(Teacher t : T.values())
{
sum+=t.afterTaxIns();
}
return sum;
}
}
```
:::
### 606_5
**執行結果**
:::success
此題**輸出結果**的**排序不影響**，但需要**名稱**、**薪水**和 ** 完全**符合**。
:::
==子class==
4. TeacherDB **printAllTeacher()**
```java=1
class TeacherDB
{
HashMap<String,Teacher> T =new HashMap<String,Teacher>();
void store(String name,Teacher t)
{
T.put(name,t);
}
double totalOfAll()
{
double sum=0;
for(Teacher t : T.values())
{
sum+=t.afterTaxIns();
}
return sum;
}
void printAllTeacher()
{
for(Teacher t:T.values())
{
try
{
if(t.salary()<1500)
{
throw new Exception("**"+t.name+" "+t.salary());
}
else
{
System.out.println(t.name+" "+t.salary());
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}
}
```
:::spoiler **整合版**
```java
import java.util.*;
abstract class Teacher
{
String name;
int rate;
int totalHours;
Teacher(String name,int rate,int totalHours)
{
this.name=name;
this.rate=rate;
this.totalHours=totalHours;
}
abstract double salary();
double afterTaxIns()
{
return salary()*0.9-100;
}
void compare(Teacher t)
{
if(this.salary()>t.salary())
{
System.out.println(this.name+" is higher than "+t.name);
}
else
{
System.out.println(t.name+" is higher than "+this.name);
}
}
}
class FullTimeTeacher extends Teacher
{
FullTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return 9*rate+((totalHours-9)*rate*0.8);
}
}
class PartTimeTeacher extends Teacher
{
PartTimeTeacher(String name,int rate,int totalHours)
{
super(name,rate,totalHours);
}
double salary()
{
return totalHours*rate;
}
}
class Manager extends FullTimeTeacher
{
int rank;
Manager(String name,int rate,int totalHours,int rank)
{
super(name,rate,totalHours);
this.rank=rank;
}
double salary()
{
return super.salary()+rank*500;
}
double getTotalSalary()
{
return salary();
}
}
class TeacherDB
{
HashMap<String,Teacher> T =new HashMap<String,Teacher>();
void store(String name,Teacher t)
{
T.put(name,t);
}
double totalOfAll()
{
double sum=0;
for(Teacher t : T.values())
{
sum+=t.afterTaxIns();
}
return sum;
}
void printAllTeacher()
{
for(Teacher t:T.values())
{
try
{
if(t.salary()<1500)
{
throw new Exception("**"+t.name+" "+t.salary());
}
else
{
System.out.println(t.name+" "+t.salary());
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}
}
```
:::
## 題目610
### 610_1
**執行結果**
==父class==
```java=1
class Employee
{
String id;
Employee(String id)
{
this.id=id;
}
}
```
==子class==
1. SalaryWorker
```java=1
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
```
2. HourlyWorker
```java=1
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
```
3. Manager
```java=1
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
```
:::spoiler **整合版**
```java
class Employee
{
String id;
Employee(String id)
{
this.id=id;
}
}
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
```
:::
### 610_2
**執行結果**
:::danger
main檔有多compare的部分要處理。
```java=1
sw1.compare(hw1);
hw1.compare(ma1);
```
:::
==父class==
```java=1
abstract class Employee
{
String id;
Employee(String id)
{
this.id=id;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
return monthPay()*0.15;
}
}
```
==main檔==
```java=1
public class JPA06_2 {
public static void main(String argv[]) {
SalaryWorker sw1 = new SalaryWorker("96001",180000);
System.out.println("SalaryWorker：" + sw1.monthPay());
HourlyWorker hw1 = new HourlyWorker("96002", 100, 160);
System.out.println("HourlyWorker：" + hw1.monthPay());
Manager ma1 = new Manager("97001", 240000, 5000);
System.out.println("Manager：" + ma1.monthPay());
sw1.compare(hw1);
hw1.compare(ma1);
System.out.println("SalaryWorker稅額：" + sw1.monthTaxes());
System.out.println("HourlyWorker稅額：" + hw1.monthTaxes());
System.out.println("Manager稅額：" + ma1.monthTaxes());
}
}
```
:::spoiler **整合版**
```java
abstract class Employee
{
String id;
Employee(String id)
{
this.id=id;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
return monthPay()*0.15;
}
}
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
public class JPA06_2 {
public static void main(String argv[]) {
SalaryWorker sw1 = new SalaryWorker("96001",180000);
System.out.println("SalaryWorker：" + sw1.monthPay());
HourlyWorker hw1 = new HourlyWorker("96002", 100, 160);
System.out.println("HourlyWorker：" + hw1.monthPay());
Manager ma1 = new Manager("97001", 240000, 5000);
System.out.println("Manager：" + ma1.monthPay());
sw1.compare(hw1);
hw1.compare(ma1);
System.out.println("SalaryWorker稅額：" + sw1.monthTaxes());
System.out.println("HourlyWorker稅額：" + hw1.monthTaxes());
System.out.println("Manager稅額：" + ma1.monthTaxes());
}
}
```
:::
### 610_3
**執行結果**
==父class==
```java=1
abstract class Employee
{
String id;
static int count=0;
static double totalTax=0;
Employee(String id)
{
this.id=id;
count++;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
totalTax+=monthPay()*0.15;
return monthPay()*0.15;
}
static double getAverageTax()
{
return totalTax/count;
}
}
```
:::spoiler **整合版**
```java
abstract class Employee
{
String id;
static int count=0;
static double totalTax=0;
Employee(String id)
{
this.id=id;
count++;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
totalTax+=monthPay()*0.15;
return monthPay()*0.15;
}
static double getAverageTax()
{
return totalTax/count;
}
}
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
```
:::
### 610_4
**執行結果**
==子class==
4. Management
```java=1
class Management
{
HashMap<String,Employee> E=new HashMap<String,Employee>();
void put(String id,Employee e)
{
E.put(id,e);
}
double afterTax(String id)
{
return E.get(id).monthPay()-E.get(id).monthTaxes();
}
}
```
:::spoiler **整合版**
```java
import java.util.*;
abstract class Employee
{
String id;
static int count=0;
static double totalTax=0;
Employee(String id)
{
this.id=id;
count++;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
totalTax+=monthPay()*0.15;
return monthPay()*0.15;
}
static double getAverageTax()
{
return totalTax/count;
}
}
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
class Management
{
HashMap<String,Employee> E=new HashMap<String,Employee>();
void put(String id,Employee e)
{
E.put(id,e);
}
double afterTax(String id)
{
return E.get(id).monthPay()-E.get(id).monthTaxes();
}
}
```
:::
### 610_5
**執行結果**
:::danger
main檔記得要填寫**自訂的方法呼叫**。
```java=1
m.totalSalary();
```
:::
==子class==
4. Management
```java=1
class Management
{
HashMap<String,Employee> E=new HashMap<String,Employee>();
void put(String id,Employee e)
{
E.put(id,e);
}
double afterTax(String id)
{
return E.get(id).monthPay()-E.get(id).monthTaxes();
}
void totalSalary()
{
double totalSalary=0;
for(Employee e:E.values())
{
totalSalary+=e.monthPay();
}
try
{
if(totalSalary>50000)
{
throw new Exception("Total salary exceed limit: "+totalSalary);
}
else
{
System.out.println("Total salary: "+totalSalary);
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}
```
==main 檔==
```java=1
public class JPA06_5 {
public static void main(String argv[]) {
SalaryWorker sw1 = new SalaryWorker("96001",180000);
HourlyWorker hw1 = new HourlyWorker("96002", 100, 160);
Manager ma1 = new Manager("97001", 240000, 5000);
Management m = new Management();
m.put("96001", sw1);
m.put("96002", hw1);
m.put("97001", ma1);
m.totalSalary();
}
}
```
:::spoiler **整合版**
```java
import java.util.*;
abstract class Employee
{
String id;
static int count=0;
static double totalTax=0;
Employee(String id)
{
this.id=id;
count++;
}
void compare(Employee e)
{
if(this.monthPay()>e.monthPay())
{
System.out.println(this.id+"較高");
}
else
{
System.out.println(e.id+"較高");
}
}
abstract double monthPay();
double monthTaxes()
{
totalTax+=monthPay()*0.15;
return monthPay()*0.15;
}
static double getAverageTax()
{
return totalTax/count;
}
}
class SalaryWorker extends Employee
{
int yearPay;
SalaryWorker(String id,int yearPay)
{
super(id);
this.yearPay=yearPay;
}
double monthPay()
{
return yearPay/12.0;
}
}
class HourlyWorker extends Employee
{
int hour,hourPay;
HourlyWorker(String id,int hour,int hourPay)
{
super(id);
this.hour=hour;
this.hourPay=hourPay;
}
double monthPay()
{
return hour*hourPay;
}
}
class Manager extends SalaryWorker
{
int bonus;
Manager(String id,int yearPay,int bonus)
{
super(id,yearPay);
this.bonus=bonus;
}
double monthPay()
{
return super.monthPay()+bonus;
}
}
class Management
{
HashMap<String,Employee> E=new HashMap<String,Employee>();
void put(String id,Employee e)
{
E.put(id,e);
}
double afterTax(String id)
{
return E.get(id).monthPay()-E.get(id).monthTaxes();
}
void totalSalary()
{
double totalSalary=0;
for(Employee e:E.values())
{
totalSalary+=e.monthPay();
}
try
{
if(totalSalary>50000)
{
throw new Exception("Total salary exceed limit: "+totalSalary);
}
else
{
System.out.println("Total salary: "+totalSalary);
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
}
public class JPA06_5 {
public static void main(String argv[]) {
SalaryWorker sw1 = new SalaryWorker("96001",180000);
HourlyWorker hw1 = new HourlyWorker("96002", 100, 160);
Manager ma1 = new Manager("97001", 240000, 5000);
Management m = new Management();
m.put("96001", sw1);
m.put("96002", hw1);
m.put("97001", ma1);
m.totalSalary();
}
}
```
:::
---
:::spoiler 最後更新日期
>==第一版==[time=2021 12 20 , 12:04 AM][color=#786ff7]
>第二版[time=2021 12 22 , 5:20 PM][color=#ce770c]
>第三版[time=2021 12 23 , 5:54 PM][color=#ce770c]
>**最後版[time=2021 12 25 , 12:38 AM]**[color=#EA0000]
:::
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