运行代码
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具体的代码如下：
import java.util.HashMap;
public class SearchDemo {
public HashMapInteger,Integer countMap(char[] arr){
HashMap countMap = new HashMapInteger, Integer();
for (int i = 0; i arr.length; i++) {
if(!countMap.containsKey(arr[i])){
countMap.put(arr[i],1);
}else{
int value = (int)countMap.get(arr[i]) + 1;
countMap.put(arr[i],value);
}
}
return countMap;
}
public static void main(String[] args) {
char[] arr={'A','1','R','!','e','','A','5','A','g','#','D'};
int count = new SearchDemo().countMap(arr).get('A');
System.out.println("其中'A'字符的个数是：" + count);
}
}
运行结果
按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下
需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果
Student.java文件代码如下
package user.java.test;
import java.io.Serializable;
public class Student implements Serializable{
private static final long serialVersionUID = 1L;
private String no;
private String name;
private double score;
public Student(){}
public Student(String no,String name,double score){
this.no=no;
this.name=name;
this.score=score;
}
public String getNo(){ return no;}
public void setNo(String no){ this.no=no;}
public String getName(){ return name;}
public void setName(String name){ this.name=name;}
public double getScore(){ return score;}
public void setScore(double score){ this.score=score;}
public String toString(){
return "学号:"+no+",姓名:"+name+",成绩:"+score;
}
public static double getAvg(Student[] sArray){
double sum=0,avg;
for(int i=0;isArray.length;i++){
sum=sum+sArray[i].getScore();
}
avg=sum/sArray.length;
return avg;
}
}
Test.java文件代码如下
package user.java.test;
public class Test{
public static void main(String[] args){
Student[] sArray=new Student[5];
sArray[0]=new Student("001","张三",89.5);
sArray[1]=new Student("002","李四",82.5);
sArray[2]=new Student("003","王五",93);
sArray[3]=new Student("004","赵六",73.5);
sArray[4]=new Student("005","孙七",66);
System.out.println("这些学生的平均分:"+Student.getAvg(sArray));
for(int i=0;isArray.length;i++){
System.out.println(sArray[i].toString());
}
}
}
此题的Employee类设计有缺陷，缺少员工薪水的属性。根据题意只能写出下面的程序：
abstract class Employee {
public abstract double earnings();
}
class YearWorker extends Employee {
@Override
public double earnings() {
return 0;
}
}
class MonthWorker extends Employee {
@Override
public double earnings() {
return 0;
}
}
class WeekWorker extends Employee {
@Override
public double earnings() {
return 0;
}
}
class Company {
Employee[] employee;
double salaries = 0;
Company(Employee[] employee) {
this.employee = employee;
}
public double salariesPay() {
salaries = 0;
//计算salaries
for(int i=0; iemployee.length; i++) {
salaries += employee[i].earnings();
}
return salaries;
}
}
public class HardWork {
public static void main(String[] args) {
Employee[] employee = new Employee[20];
for(int i=0; iemployee.length; i++) {
if(i % 3 == 0) {
employee[i] = new YearWorker();
}
else if(i % 3 == 1) {
employee[i] = new MonthWorker();
}
else if(i % 3 == 2) {
employee[i] = new WeekWorker();
}
}
Company company = new Company(employee);
System.out.println("公司年工资总额:" + company.salariesPay());
}
}
运行结果：
公司年工资总额:0.0
下面是第一题，采纳此答案发第二题代码
========分割线=========
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class Q1 {
public static void main(String[] args) {
try {
Scanner scanner=new Scanner(System.in);
String data = scanner.nextLine();
File file = new File("java\\code");
if (!file.exists()) {
file.mkdirs();
}
File file1=new File(file,"mydata.txt");
if (!file1.exists()) {
file1.createNewFile();
}
FileWriter fw = new FileWriter(file1.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(data);
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
