java練習(xí)題求完整代碼

按照題目要求編寫的用javaBean規(guī)范設(shè)計(jì)的學(xué)生類Student的Java程序如下

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需要?jiǎng)?chuàng)建user.java.test包,把Student.java文件和Test.java文件放入包中,編譯Student.java文件并且編譯運(yùn)行Test.java文件得到運(yùn)行結(jié)果

Student.java文件代碼如下

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 "學(xué)號:"+no+",姓名:"+name+",成績:"+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文件代碼如下

package user.java.test;

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5];

sArray[0]=new Student("001","張三",89.5);

sArray[1]=new Student("002","李四",82.5);

sArray[2]=new Student("003","王五",93);

sArray[3]=new Student("004","趙六",73.5);

sArray[4]=new Student("005","孫七",66);

System.out.println("這些學(xué)生的平均分:"+Student.getAvg(sArray));

for(int i=0;isArray.length;i++){

System.out.println(sArray[i].toString());

}

}

}

JAVA題求，有點(diǎn)急，要求不要太復(fù)雜，謝謝

百度好像不支持代碼格式了，下面的代碼供題主參考。

public class CopyFile {

public static void main(String[] args) throws IOException {

String srcFilePath = "D:/src.txt";

String destFilePath1 = "D:/des1.txt";

String destFilePath2 = "D:/des2.txt";

//字節(jié)流拷貝

copyFileWithStream(srcFilePath,destFilePath1);

//字符流拷貝

copyFileWithReader(srcFilePath,destFilePath2);

}

public static void copyFileWithStream(String srcFilePath,String destFilePath) throws IOException {

InputStream is? = new FileInputStream(srcFilePath);

FileOutputStream os = new FileOutputStream(destFilePath);

byte[] buff = new byte[1024];

int len;

while((len=is.read(buff)) != -1){

os.write(buff);

}

os.flush();

is.close();

os.close();

}

public static void copyFileWithReader(String srcFilePath,String destFilePath) throws IOException {

Reader reader = new FileReader(srcFilePath);

BufferedReader buffReader = new BufferedReader(reader);

Writer wirter = new FileWriter(destFilePath);

BufferedWriter buffWriter = new BufferedWriter(wirter);

String line;

while((line=buffReader.readLine()) != null) {

buffWriter.write(line);

}

buffWriter.flush();

reader.close();

wirter.close();

}

}

java練習(xí)題求解希望有完整代碼

運(yùn)行代碼

具體的代碼如下：

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'字符的個(gè)數(shù)是：" + count);

}

}

運(yùn)行結(jié)果

幾道JAVA題目，求好心人給下答案，感激不盡

1、public static void main(String[] args)

2、public finall static

3、3

4、抽象類

5、implements

6、類：一個(gè)包含屬性、方法，使用class關(guān)鍵字定義

對象：創(chuàng)建對象必須使用new關(guān)鍵字，對象其實(shí)在內(nèi)存中存儲(chǔ)的是類的引用地址。

7、try是可能發(fā)生異常的內(nèi)容；

catch是發(fā)生異常后要處理的代碼；

finally是始終執(zhí)行的，比如關(guān)閉資源等。

8、

public?class?Demo?{

//小明今年12歲，他母親比他大20歲。編程計(jì)算多少年后他母親的年齡是小明的2倍。

public?static?void?main(String[]?args)?{

System.out.println(getYeah());

}

public?static?int?getYeah(){

int?xmAge?=?12,mqAge?=?20,yeah?=?0;

while(true){

if(mqAge?/?2?==?xmAge){

return?yeah;

}

mqAge++;

yeah++;

}

}

}

9、

public?class?Demo?{

public?static?void?main(String[]?args)?{

new?Thread(new?Piao()).start();

new?Thread(new?Piao()).start();

new?Thread(new?Piao()).start();

new?Thread(new?Piao()).start();

}

}

class?Piao?implements?Runnable{

private?static?int?piao?=?1;

public??void?run(){

while(true){

synchronized(Piao.class){

if(piao??100){

System.exit(0);

}

System.out.println(Thread.currentThread().getName()+"出票："?+?piao?+?"號");

piao++;

}

}

}

}