140 - 家电类
Time Limit: 1000 Memory Limit: 65535
Submit: 105 Solved: 69
Description
某大型家电企业拥有一批送货卡车，运送电视机、洗衣机、空调等家电。编程计算每个卡车所装载货物的总重量。要求有一个Appliance（家电）接口和有三个实现类TV、WashMachine和AirConditioner，这些类能够提供自重。有一个Truck类，包含了该货车上的所有家电，用一个集合（数组或集合类）表示。
Main函数中程序能够输出Truck类所装载货物的总重量。
Input
家电数量
家电种类编号 家电重量
注意：各个家电的编号为：TV：1 WashMachine：2 AirConditioner：3
Output
总重量
Sample Input
5
1 20
2 30
3 25
3 30
2 40
Sample Output
145
_____________
import java.util.*;
public class Main{
public static void main(String[] args) {
Truck t=new Truck();
Scanner scan = new Scanner(System.in);
int num= scan.nextInt();
int type;
int weight;
for(int i=0;i { type = scan.nextInt(); weight = scan.nextInt(); t.getWeight(weight); t.sortit(type,weight); } t.getSum(); scan.close(); } } interface Appliance { void setWeight(int b); } class Truck{ public int sumweight; public void getWeight(int a){ this.sumweight+=a; } public void sortit(int t,int w) { if(t==1) { TV x=new TV(w); } else if(t==2) { WashMachine x=new WashMachine(w); } else if(t==3) { AirConditioner x=new AirConditioner(w); } } public void getSum() { System.out.println(sumweight); } } class TV implements Appliance { int weight; public TV(int weight) { this.weight=weight; } @Override public void setWeight(int b) { // TODO Auto-generated method stub weight=b; } public int getWeight() { return weight; } } class WashMachine implements Appliance { int weight; public WashMachine(int weight) { this.weight=weight; } @Override public void setWeight(int b) { // TODO Auto-generated method stub weight=b; } public int getWeight() { return weight; } } class AirConditioner implements Appliance { int weight; public AirConditioner(int weight) { this.weight=weight; } @Override public void setWeight(int b) { // TODO Auto-generated method stub weight=b; } public int getWeight() { return weight; } } ########################################### 150 - 教师类 Time Limit: 1000 Memory Limit: 65535 Submit: 133 Solved: 60 Description 设计一个教师类Teacher,要求： 属性有编号（int no）、姓名（String name）、年龄（int age）、所属学院（String seminary），为这些属性设置相应的get和set方法。 为Teacher类重写equals方法，要求：当两个教师对象的no相同时返回true。 重写Teacher类的toString方法，通过该方法可以返回“no: **, name:**, age: **, seminary: **”形式的字符串。 Input 两个教师对象的编号，姓名，年龄，学院 Output 教师的信息 两个教师是否相等 Sample Input 1 Linda 38 SoftwareEngineering 2 Mindy 27 ComputerScience Sample Output no: 1, name:Linda, age: 38, seminary: SoftwareEngineering no: 2, name:Mindy, age: 27, seminary: ComputerScience false ______________________ import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); int no1=scan.nextInt(); String name1=scan.next(); int age1=scan.nextInt(); String seminary1=scan.next(); Teacher t1=new Teacher(no1,name1,age1,seminary1); int no2=scan.nextInt(); String name2=scan.next(); int age2=scan.nextInt(); String seminary2=scan.next(); Teacher t2=new Teacher(no2,name2,age2,seminary2); System.out.println(t1); System.out.println(t2); System.out.println(t1.equals(t2)); scan.close(); } } class Teacher{ int no; String name; int age; String seminary; public Teacher(int no,String name,int age,String seminary) { this.no=no; this.name=name; this.age=age; this.seminary=seminary; } int getNo() {return no;} String getName() {return name;} int getAge() {return age;} String getSeminary() {return seminary;} void setNo(int n) {no=n;} void setName(String na) {name=na;} void setAge(int a) {age=a;} void setSeminary(String s) {seminary=s;} public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof Teacher) { Teacher rec = (Teacher) o; if (this.no == rec.no) { result = true; } } return result; } } public String toString() { return "no: "+no+", name:"+name+", age: "+age+", seminary: "+seminary; } } ############################### 149 - 教师类-2 Time Limit: 1000 Memory Limit: 65535 Submit: 141 Solved: 53 Description 修改题目143 1. 修改教师类，使得由多个Teacher对象所形成的数组可以排序（编号由低到高排序），并在main函数中使用Arrays.sort(Object[] a)方法排序 2. 定义一个类TeacherManagement，包含教师数组，提供方法add(Teacher[])，使其可以添加教师，提供重载方法search，方法可以在一组给定的教师中，根据姓名或年龄返回等于指定姓名或年龄的教师的字符串信息，信息格式为：“no: **, name:**, age: **, seminary: **”。如果没有满足条件的教师，则返回“no such teacher”。 Input 教师个数 教师信息 待查找教师的姓名 待查找教师的年龄 Output 排序后的信息 按姓名查找的老师信息 按年龄查找的老师信息 Sample Input 4 3 Linda 38 SoftwareEngineering 1 Mindy 27 ComputerScience 4 Cindy 28 SoftwareEngineering 2 Melody 27 ComputerScience Cindy 27 Sample Output no: 1, name: Mindy, age: 27, seminary: ComputerScience no: 2, name: Melody, age: 27, seminary: ComputerScience no: 3, name: Linda, age: 38, seminary: SoftwareEngineering no: 4, name: Cindy, age: 28, seminary: SoftwareEngineering search by name: no: 4, name: Cindy, age: 28, seminary: SoftwareEngineering search by age: no: 1, name: Mindy, age: 27, seminary: ComputerScience no: 2, name: Melody, age: 27, seminary: ComputerScience ____________________________________________ import java.lang.reflect.Array; import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); int num=scan.nextInt(); TeacherManagement tt=new TeacherManagement(num); Teacher[] t=new Teacher[num]; for(int i=0;i int no=scan.nextInt(); String name=scan.next(); int age=scan.nextInt(); String seminary=scan.next(); t[i] = new Teacher(no,name,age,seminary); } tt.add(t); Arrays.sort(t); for(int i=0;i System.out.println(t[i].toString()); } String namejuge=scan.next(); tt.search(namejuge); int agejuge=scan.nextInt(); tt.search(agejuge); scan.close(); } } class Teacher implements Comparable int no; String name; int age; String seminary; public Teacher(int no,String name,int age,String seminary) { this.no=no; this.name=name; this.age=age; this.seminary=seminary; } int getNo() {return no;} String getName() {return name;} int getAge() {return age;} String getSeminary() {return seminary;} void setNo(int n) {no=n;} void setName(String na) {name=na;} void setAge(int a) {age=a;} void setSeminary(String s) {seminary=s;} /* public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof Teacher) { Teacher rec = (Teacher) o; if (this.no == rec.no) { result = true; } } return result; } }*/ public String toString() { return "no: "+no+", name: "+name+", age: "+age+", seminary: "+seminary; } public int compareTo(Teacher t) { if(this.no return -1; else if(this.no==t.no) return 0; else return 1; } } class TeacherManagement{ int num; Teacher[] t; public TeacherManagement(int num) { this.num=num; this.t=new Teacher[num]; } void add(Teacher[] t) { this.t=t; } void search(int age){ int f=0; System.out.println("search by age:"); for (Teacher tt : t) { if (tt.age == age) { f=1; System.out.println(tt.toString()); } } if(f==0){ System.out.println("no such teacher"); } } void search(String name){ int f=0; System.out.println("search by name:"); for (Teacher tt : t) { if (tt.name.equals(name)) { f=1; System.out.println(tt.toString()); } } if(f==0){ System.out.println("no such teacher"); } } } ################################### 142 - 计算机类 Time Limit: 1000 Memory Limit: 65535 Submit: 100 Solved: 49 Description 构造计算机类，其中包含其配置信息：处理器、主板、内存、显示器、硬盘等设备，各个设备均有型号（字符串），特别的，处理器有主频（小数）和内核数（整数）、显示器有尺寸（整型）、内存和硬盘有容量数据（GB为单位）。请你尝试构造合适的类和类的关系来表示计算机，并为该计算机类添加计算价格（各设备价格之和）、打印配置信息等方法。重写相关类的equals方法，使得两个配置完全相同的计算机为相同的计算机。重写相关类的toString函数，打印计算机的配置信息。 在main函数中 Input 两个计算机对象，包含 CPU：型号、主频、内核 主板：型号 内存：容量 显示器：尺寸 硬盘：容量 Output 两个对象是否相等 两个对象的配置信息 Sample Input Corei7 2.8 4 GIGABYTE-B250M-D3H xiede-DDR3 8 SamsungC27F39 27 SEAGATE-ST1000DM010 2048 Corei7 2.8 4 GIGABYTE-B250M-D3H xiede-DDR3 8 SamsungC27F39 27 SEAGATE-ST1000DM010 2048 Sample Output true Computer1: CPU: Model: Corei7 Frequency: 2.8 Number of Cores: 4 Mainboard: Model: GIGABYTE-B250M-D3H Memory: Model: xiede-DDR3 Size: 8 Screen: Model: SamsungC27F39 Size: 27 Harddisk: Model: SEAGATE-ST1000DM010 Size: 2048 Computer2: CPU: Model: Corei7 Frequency: 2.8 Number of Cores: 4 Mainboard: Model: GIGABYTE-B250M-D3H Memory: Model: xiede-DDR3 Size: 8 Screen: Model: SamsungC27F39 Size: 27 Harddisk: Model: SEAGATE-ST1000DM010 Size: 2048 HINT 为计算机类和各个组成配件都构造类，分别重写toString和equals方法 在计算机类中调用各个配件的equals和toString方法 回车用\n 小数用String.format("%.1f",1.234) ____________________________________ import java.lang.reflect.Array; import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); String CPUmodel=scan.next(); String frequency=scan.next(); int cores = scan.nextInt(); CPU cpu1= new CPU(CPUmodel,frequency,cores); String MainboardModel = scan.next(); Mainboard mainboard1 = new Mainboard(MainboardModel); String MemoryModel = scan.next(); int MemorySize = scan.nextInt(); Memory memory1 = new Memory(MemoryModel,MemorySize); String ScreenModel = scan.next(); int ScreenSize = scan.nextInt(); Screen screen1 = new Screen(ScreenModel,ScreenSize); String HdModel = scan.next(); int HdSize = scan.nextInt(); HD hd1 = new HD(HdModel,HdSize); ALLMachine machine1=new ALLMachine(cpu1,mainboard1,memory1,screen1,hd1); String CPUmodel2=scan.next(); String frequency2=scan.next(); int cores2 = scan.nextInt(); CPU cpu2= new CPU(CPUmodel2,frequency2,cores2); String MainboardModel2 = scan.next(); Mainboard mainboard2 = new Mainboard(MainboardModel2); String MemoryModel2 = scan.next(); int MemorySize2= scan.nextInt(); Memory memory2 = new Memory(MemoryModel2,MemorySize2); String ScreenModel2 = scan.next(); int ScreenSize2 = scan.nextInt(); Screen screen2 = new Screen(ScreenModel2,ScreenSize2); String HdModel2 = scan.next(); int HdSize2 = scan.nextInt(); HD hd2 = new HD(HdModel2,HdSize2); ALLMachine machine2=new ALLMachine(cpu2,mainboard2,memory2,screen2,hd2); System.out.println(machine1.equals(machine2)); System.out.println("Computer1:"); System.out.print(machine1.toString()); System.out.println("Computer2:"); System.out.print(machine2.toString()); scan.close(); } } class Computer{ String model; public Computer(String model) { this.model=model; } void getPrice() {} } class CPU extends Computer{ String frequency; int cores; public CPU(String model,String frequency,int cores) { super(model); this.frequency=frequency; this.cores=cores; } public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof CPU) { CPU rec = (CPU) o; if (this.model.equals(rec.model) && this.frequency.equals(rec.frequency)&&this.cores==rec.cores) { result = true; } } return result; } } public String toString() { return "CPU:"+'\n'+"Model: "+model+'\n'+"Frequency: "+frequency+'\n'+"Number of Cores: "+cores+'\n'; } } class Mainboard extends Computer{ public Mainboard(String model) { super(model); } public String toString() { return "Mainboard:"+'\n'+"Model: "+model+'\n'; } public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof Mainboard) { Mainboard rec = (Mainboard) o; if (this.model.equals(rec.model)) { result = true; } } return result; } } } class Memory extends Computer{ int size; public Memory(String model,int size) { super(model); this.size=size; } public String toString() { return "Memory:"+'\n'+"Model: "+model+'\n'+"Size: "+size+'\n'; } public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof Memory) { Memory rec = (Memory) o; if (this.model.equals(rec.model)&&this.size==rec.size) { result = true; } } return result; } } } class Screen extends Computer{ int size; public Screen(String model,int size) { super(model); this.size=size; } public String toString() { return "Screen:"+'\n'+"Model: "+model+'\n'+"Size: "+size+'\n'; } public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof Screen) { Screen rec = (Screen) o; if (this.model.equals(rec.model)&&this.size==rec.size) { result = true; } } return result; } } } class HD extends Computer{ int size; public HD(String model,int size) { super(model); this.size=size; } public String toString() { return "Harddisk:"+'\n'+"Model: "+model+'\n'+"Size: "+size+'\n'; } public boolean equals(Object o) { if (o == null) return false; else { boolean result = false; if (o instanceof HD) { HD rec = (HD) o; if (this.model.equals(rec.model)&&this.size==rec.size) { result = true; } } return result; } } } class ALLMachine{ CPU cpu; Mainboard mainboard; Memory memory; Screen screen; HD hd; ALLMachine(CPU cpu,Mainboard mainboard,Memory memory,Screen screen,HD hd){ this.cpu = cpu; this.mainboard = mainboard; this.memory = memory; this.screen = screen; this.hd= hd; } public boolean equals(Object o){ if(o==null) return false; else if(o instanceof ALLMachine){ ALLMachine c = (ALLMachine) o; return this.cpu.equals(c.cpu) && this.mainboard.equals(c.mainboard) && this.memory.equals(c.memory) && this.screen.equals(c.screen) && this.hd.equals(c.hd); } else return false; } public String toString() { return cpu.toString() + mainboard.toString() + memory.toString() + screen.toString() + hd.toString(); } } ############################################# 139 - 整数数组比较 Time Limit: 1000 Memory Limit: 65535 Submit: 82 Solved: 57 Description 给定两个整型数组A和B，将A的元素复制到B中，使得两个数组完全相同。再将B数组从小到大排列，将两数组的同一位置上对应的元素进行比较，统计出A中大于B的元素个数，等于B中元素的个数，小于B中的元素的个数。 Input 数组A的个数 数组A元素 Output A大于B的个数 A等于B的个数 A小于B的个数 Sample Input 10 23 1 32 87 65 12 21 9 76 45 Sample Output 4 1 5 HINT 可用Arrays.sort排序 ______________________________ import java.lang.reflect.Array; import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); int num=scan.nextInt(); int[] A=new int[num]; for(int i=0;i A[i]=scan.nextInt(); } int[] B=A.clone(); Arrays.sort(B); int x=0,y=0,z=0; for(int i=0;i if(A[i]>B[i]) { x++; } else if(A[i]==B[i]) { y++; } else z++; } System.out.println(x); System.out.println(y); System.out.println(z); scan.close(); } } #################################### 151 - 矩阵类 Time Limit: 1000 Memory Limit: 65535 Submit: 109 Solved: 44 Description 利用二维数组（double[]）实现一个矩阵类：Matrix。要求提供以下方法：（1）set（int row, int col, double value）：将第row行第col列的元素赋值为value；（2）get（int row，int col）：取第row行第col列的元素；（3）width()：返回矩阵的列数；（4）height()：返回矩阵的行数；（5）Matrix add（Matrix b）：返回当前矩阵与矩阵b相加后的矩阵；（6）Matrix multiply（Matrix b）：返回当前矩阵与矩阵b相乘后的矩阵。（7）Matrix transpose()：返回当前矩阵的转置矩阵；（8）toString()：以行和列的形式打印出当前矩阵。 Input 矩阵的行列数 矩阵的数据 设置矩阵值的行、列和值 获取矩阵值的行、列 待相加矩阵的行列数 待相加矩阵的值 待相乘矩阵的行列数 待相乘矩阵的值 Output 矩阵的行、列数 设置矩阵值后的矩阵 某行某列的矩阵值 矩阵相加结果 矩阵相乘结果 矩阵转置结果 Sample Input 3 3 1 2 3 4 5 6 7 8 9 2 3 8 1 3 3 3 1 2 3 4 5 6 7 8 9 3 2 1 2 1 2 1 2 Sample Output row:3 column:3 after set value: 1 2 3 4 5 8 7 8 9 value on (1,3):3 after add: 2 4 6 8 10 14 14 16 18 after multiply: 6 12 17 34 24 48 aftesr transpose: 1 4 7 2 5 8 3 8 9 _________________________ import java.lang.reflect.Array; import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); int row=scan.nextInt(); int col=scan.nextInt(); Matrix x=new Matrix(row,col); for(int i=0;i for(int j=0;j double value=scan.nextDouble(); x.set(i,j,value); } } System.out.println("row:"+row+" column:"+col); int whererow=scan.nextInt(); int wherecol=scan.nextInt(); double wherenumber=scan.nextDouble(); x.set(whererow-1, wherecol-1, wherenumber); int searchrow=scan.nextInt(); int searchcol=scan.nextInt(); System.out.println("after set value:"); System.out.println(x); System.out.println("value on ("+searchrow+","+searchcol+"):"+(int)x.get(searchrow-1, searchcol-1)); int addrow=scan.nextInt(); int addcol=scan.nextInt(); Matrix y=new Matrix(addrow,addcol); for(int i=0;i for(int j=0;j double value=scan.nextDouble(); y.set(i,j,value); } } System.out.println(y.add(x)); int multirow=scan.nextInt(); int multicol=scan.nextInt(); Matrix z=new Matrix(multirow,multicol); for(int i=0;i for(int j=0;j double value=scan.nextDouble(); z.set(i,j,value); } } System.out.println(x.multiply(z)); System.out.println(x.transpose()); scan.close(); } } class Matrix{ int row; int col; double matrix[][]; public Matrix(int row,int col) { this.row=row; this.col=col; this.matrix=new double[row][col]; } void set(int row, int col, double value){ matrix[row][col]=value; } double get(int row,int col) { return this.matrix[row][col]; } int width() { return col; } int height() { return row; } Matrix add(Matrix b){ System.out.println("after add:"); for(int i=0;i for(int j=0;j this.matrix[i][j]+=b.matrix[i][j]; } } return this; } Matrix multiply(Matrix b){ System.out.println("after multiply:"); Matrix c=new Matrix(this.row,b.col); for(int i=0;i for(int j=0;j double t=0; for(int k=0;k t+=this.matrix[i][k]*b.matrix[k][j]; } c.set(i, j, t); } } return c; } Matrix transpose() { System.out.println("after transpose:"); for(int i=0;i for(int j=0;j double t=this.matrix[i][j]; this.matrix[i][j]=this.matrix[j][i]; this.matrix[j][i]=t; } } return this; } public String toString() { String t=""; for(int i=0;i for(int j=0;j if(j!=0) t+=" "; t+=(int)(this.matrix[i][j]); } if(i!=row-1) t+="\n"; } return t; } } ####################################################