java代码练习题 java编程代码题库及答案
java练习题求解希望有完整代码
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
java练习题求完整代码
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());
}
}
}
JAVA 练习题
public class JavaExos {
public static void charInt(String chaine){ //1044
String[] charInt = new String[2];
int count = -1;
char maxChar = 'A';
int[] letterCount = new int[26];
String word = chaine.toLowerCase();
for (int i=0;iword.length();i++) {
int indexOfChar = (byte)word.charAt(i)-97;
letterCount[indexOfChar]++;
if (letterCount[indexOfChar]count || (letterCount[indexOfChar]==count word.charAt(i)maxChar)){
count = letterCount[indexOfChar];
maxChar = word.charAt(i);
}
}
charInt[0] = String.valueOf(maxChar);
charInt[1] = ""+count;
System.out.println(charInt[0]+" "+charInt[1]);
}
public static void getDate(int n){ //1047 这题如果给1,其实是指2000年1月2号.
n++;
int[] getYear = getYear(n);
int year = getYear[0];
int[] getMonth = getMonth(year,getYear[1]);
int month = getMonth[0];
String monthString ;
if(month10) monthString = "0"+String.valueOf(month);
else monthString = String.valueOf(month);
int day = getMonth[1];
System.out.println(year+"-"+monthString+"-"+day+" "+getDayOfWeek(n));
}
private static boolean isBissextile(int n){
if (n%4==0 !(n%100==0n%400!=0))
return true;
else
return false;
}
private static int[] getYear(int n){
int[] getYear = new int[2];
int year = 2000;
while(n0){
if(isBissextile(year)) n -= 366;
else n -= 365;
if (n0) year++;
}
if(isBissextile(year)) n+=366;
else n += 365;
getYear[0] = year;
getYear[1] = n;
return getYear;
}
private static int[] getMonth(int year, int n){
int[] getMonth = new int[2];
int month = 1;
while(n0){
if(month=7 month%2 != 0) n -= 31;
else if (month==2 isBissextile(year) ) n -= 29;
else if (month==2 !isBissextile(year)) n -= 28;
else if(month=7 month%2==0) n -= 30;
else if(month%2==0) n-=31;
else n -= 30;
if (n0) month++;
}
if(month=7 month%2 != 0) n += 31;
else if (isBissextile(year) month==2) n += 29;
else if (!isBissextile(year) month==2) n += 28;
else if(month=7 month%2==0) n += 30;
else if(month%2==0) n+=31;
else n += 30;
getMonth[0] = month;
getMonth[1] = n;
return getMonth;
}
private static String getDayOfWeek(int n){
int quotient = n/7;
int remainder = n -= quotient*7;
switch(remainder){
case 0 : return "Sunday";
case 1 : return "Monday";
case 2 : return "Tuesday";
case 3 : return "Wednesday";
case 4 : return "Thursday";
case 5 : return "Friday";
case 6 : return "Saturday";
default : return "Never arrive";
}
}
public static void getCode(String chaine){ //1048
chaine = chaine.toUpperCase();
System.out.println("START");
System.out.println(chaine);
System.out.println("END");
System.out.println();
for(int i=0;ichaine.length();i++){
System.out.print((changChar(chaine.charAt(i))));
}
System.out.println();
}
private static char changChar(char c){
if(c=65 c=90 c-565) return (char)(c+26-5);
else if(c=65 c=90) return (char)(c-5);
else return c;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JavaExos.charInt("adfadffasdfda");
JavaExos.getDate(1751);
JavaExos.getCode("NS BFW, JAJSYX TK NRUTWYFSHJ FWJ YMJ WJXZQY TK YWNANFQ HFZXJX");
java练习题求大神刚学
按照题目要求编写的商品类Item的Java程序如下
public class Item{
public String code,name,type;
public double price;
public static int totalNum=0;
public Item(){}
public Item(String code,String name){
this.code=code;
this.name=name;
totalNum++;
}
public static void main(String[] args){
Item[] item=new Item[10];
item[0]=new Item("666","戴尔(DELL) 游戏笔记本");
item[0].type="游戏";item[0].price=5499.00;
item[1]=new Item("007","苹果（Macbook pro）笔记本");
item[1].type="电脑,办公";item[1].price=18000.00;
for(int i=0;iItem.totalNum;i++){
System.out.println("名称:"+item[i].name+",价格:"+item[i].price);
}
System.out.println("总商品数量:"+Item.totalNum);
}
}
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