我是靠谱客的博主 阔达酒窝，最近开发中收集的这篇文章主要介绍Java语言程序设计与数据结构（基础篇）课后练习题 第十二章（四）12.2412.2512.2612.2712.2812.2912.3012.3112.3212.33第十二章习题 完，觉得挺不错的，现在分享给大家，希望可以做个参考。
概述
12.24
import java.io.File;
import java.io.PrintWriter;
public class dishierzhang {
public static void main(String[] args) throws Exception {
String str1;
StringBuilder s1 = new StringBuilder();
File file = new File(args[0]);
String f = "FristName";
String l = "LastName";
try (PrintWriter p = new PrintWriter(file);) {
for (int i = 0; i < 1000; i++) {
s1.append(f + i + l + i);
str1 = getGradeName((int) (Math.random() * 2 + 1));
s1.append(" " + str1);
s1.append(" " + getSalary(str1));
p.println(s1.toString());
s1.delete(0, s1.length());
}
}
}
public static String getGradeName(int i) {
String s = null;
if (i < 1 || i > 3) {
System.out.println("Wrong!");
System.exit(1);
}
switch (i) {
case 1:
return s = "assistant";
case 2:
return s = "associate";
case 3:
return s = "full";
}
return s;
}
public static String getSalary(String s) {
String s1 = null;
double salary = 0;
if (!(s.equalsIgnoreCase("assistant") || s.equalsIgnoreCase("associate") || s.equalsIgnoreCase("full"))) {
System.out.println("Uage: getSalary Error");
System.exit(2);
}
if (s.equalsIgnoreCase("assistant")) {
salary = Math.random() * 30000 + 50000;
} else if (s.equalsIgnoreCase("associate")) {
salary = Math.random() * 50000 + 60000;
} else if (s.equalsIgnoreCase("full")) {
salary = Math.random() * 55000 + 75000;
}
s1 = String.valueOf(salary);
System.out.println(s1);
int index = s1.indexOf('.');
s1 = s1.substring(0, index + 3);
return s1;
}
}
12.25
import java.net.URL;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
double salaryAssistant = 0;
int countAssistant = 0;
double salaryAssociate = 0;
int countAssociate = 0;
double salaryFull = 0;
int countFull = 0;
double SalaryQuantity = 0;
URL url = new URL("http://liveexample.pearsoncmg.com/data/Salary.txt");
String s = null;
try (Scanner input = new Scanner(url.openStream());) {
while (input.hasNext()) {
s = input.nextLine();
String[] s1 = s.split(" ");
SalaryQuantity = Double.valueOf(s1[s1.length - 1]);
if (s1[s1.length - 2].equalsIgnoreCase("assistant")) {
salaryAssistant += SalaryQuantity;
countAssistant++;
} else if (s1[s1.length - 2].equalsIgnoreCase("associate")) {
salaryAssociate += SalaryQuantity;
countAssociate++;
} else if (s1[s1.length - 2].equalsIgnoreCase("full")) {
salaryFull += SalaryQuantity;
countFull++;
}
s = null;
}
}
System.out.println("Count: " + countAssistant + ", Salary: " + salaryAssistant + ", Aver: "
+ salaryAssistant / countAssistant);
System.out.println("Count: " + countAssociate + ", Salary: " + salaryAssociate + ", Aver: "
+ salaryAssociate / countAssociate);
System.out.println("Count: " + countFull + ", Salary: " + salaryFull + ", Aver: " + salaryFull / countFull);
}
}
12.26
import java.io.File;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);
System.out.print("Enter a directory: ");
String s = input.next();
File file = new File(s);
if (file.mkdir()) {
System.out.println("Directory created successfully");
} else {
System.out.println("Directory already exists");
}
}
}
12.27
略
12.28
import java.io.File;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);
System.out.print("Enter a file path:");
File file = new File(path(input.next()));
renameFile(file);
}
public static String path(String path) {
return path.replaceAll("\\", "/");
}
public static void renameFile(File file) {
if (getNewName(file).equals("gg")) {
if (file.isFile()) {
return;
} else {
directory(file);
}
} else if (file.isDirectory()) {
directory(file);
file(file);
} else if (file.isFile()) {
file(file);
}
}
public static File file(File file) {
File newFile = new File(getNewName(file));
System.out.println(newFile.getAbsolutePath() + " " + file.renameTo(newFile));
return newFile;
}
public static void directory(File file) {
File[] subFile = file.listFiles();
System.out.println(file.getAbsolutePath());
for (File everyFile : subFile) {
renameFile(everyFile);
}
}
public static String getNewName(File file) {
String name = path(file.getAbsolutePath());
String newName = null;
if (!name.contains("Exercise")) {
return "gg!";
}
String tail = name.substring(name.lastIndexOf("Exercise"), name.length());
if (tail.contains(".")) {
String[] countNum = tail.split("[ercise_.]");
if (countNum[countNum.length - 3].length() == 1) {
countNum[countNum.length - 3] = "0" + countNum[countNum.length - 3];
}
newName = name.substring(0, name.lastIndexOf("Exercise")) + "Exercise" + countNum[countNum.length - 3] + "_"
+ countNum[countNum.length - 2] + "." + countNum[countNum.length - 1];
} else {
String[] countNum = tail.split("[ercise_]");
if (countNum[countNum.length - 2].length() == 1) {
countNum[countNum.length - 2] = "0" + countNum[countNum.length - 2];
}
newName = name.substring(0, name.lastIndexOf("Exercise")) + "Exercise" + countNum[countNum.length - 2] + "_"
+ countNum[countNum.length - 1];
}
return newName;
}
}
12.29
略
12.30
import java.io.File;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
int[] alphabet = new int[26];
Scanner input = new Scanner(System.in);
System.out.print("Enter a filename: ");
String s = input.next();
File file = new File(s);
if(!file.exists()){
System.out.println("Not Exist!");
System.exit(1);
}
Scanner output = new Scanner(file);
while(output.hasNextLine()){
String l = output.nextLine().toUpperCase();
for(int i=0;i<l.length();i++)
if(Character.isLetter(l.charAt(i)))
alphabet[l.charAt(i)-'A']++;
}
for(int i=0;i<26;i++)
System.out.println("Number of "+(char)(i+'A')+"s: "+alphabet[i]);
}
}
12.31
这个题感觉有点问题，中间split分裂后的数组s1[1]和s1[2]特别奇怪。。。。。差点给我搞吐了，不过还是做出来了，搞定！
import java.net.URL;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);
System.out.print("Enter the year: ");
String year = input.next();
System.out.print("Enter the gender: ");
String gender = input.next(); //M是男，F是女。
System.out.print("Enter the name: ");
String name = input.next();
URL url = new URL("http://liveexample.pearsoncmg.com/data/babynamesranking" + year + ".txt");
String s = null;
try (Scanner input1 = new Scanner(url.openStream());) {
while (input1.hasNextLine()) {
s = input1.nextLine();
String[] s1 = s.split(" ");
if (gender.equals("M")) {
if (s1[1].matches("(.*)" + name + "(.*)")) {
System.out.print(name + " is ranked #" + s1[0] + " in vear " + year);
System.exit(0);
}
} else if (gender.equals("F")) {
if (s1[2].matches("(.*)" + name + "(.*)")) {
System.out.print(name + " is ranked #" + s1[0] + " in vear " + year);
System.exit(0);
}
} else {
System.out.println("Wrong,gender!");
System.exit(1);
}
s = null;
}
}
System.out.println("The name " + name + " is not ranked in vear " + year);
}
}
12.32
照着上面的代码，自己改改吧。
12.33
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;
public class dishierzhang {
public static void main(String[] args) throws Exception {
Scanner input = new Scanner(System.in);
System.out.print("Enter a urlString : ");
String urlString = input.nextLine();
System.out.print("Enter a word: ");
String word = input.next();
input.nextLine();
check(word, urlString);
}
public static void check(String word, String s) {
ArrayList<String> listOfPendingURLs = new ArrayList<>();
ArrayList<String> listOfTraversedURLs = new ArrayList<>();
listOfPendingURLs.add(s);
boolean b = true;
while (b) {
String urlString = listOfPendingURLs.remove(0);
if (!listOfTraversedURLs.contains(urlString)) {
listOfTraversedURLs.add(urlString);
if (getWord(word, urlString)) {
System.out.println(urlString);
System.exit(1);
}
for (String everyURL : getSubURLs(urlString)) {
if (!listOfTraversedURLs.contains(everyURL)) {
listOfPendingURLs.add(everyURL);
}
}
}
if (listOfPendingURLs.size() == 0) {
System.out.println("Not find the " + word);
b = false;
}
}
}
public static boolean getWord(String word, String urlString) {
try {
Scanner input = new Scanner(new URL(urlString).openStream());
while (input.hasNextLine()) {
String everyLine = input.nextLine();
if (everyLine.contains(word)) {
return true;
}
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return false;
}
public static ArrayList<String> getSubURLs(String urlString) {
ArrayList<String> list = new ArrayList<>();
try {
URL url = new URL(urlString);
Scanner input = new Scanner(url.openStream());
int i = 0;
while (input.hasNext()) {
String line = input.nextLine();
i = line.indexOf("http:");
while (i > 0) {
int endIndex = line.indexOf(""", i);
if (endIndex > 0) {
list.add(line.substring(i, endIndex));
i = line.indexOf("http:", endIndex);
} else
i = -1;
}
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return list;
}
}
第十二章习题 完
最后
以上就是阔达酒窝为你收集整理的Java语言程序设计与数据结构（基础篇）课后练习题 第十二章（四）12.2412.2512.2612.2712.2812.2912.3012.3112.3212.33第十二章习题 完的全部内容，希望文章能够帮你解决Java语言程序设计与数据结构（基础篇）课后练习题 第十二章（四）12.2412.2512.2612.2712.2812.2912.3012.3112.3212.33第十二章习题 完所遇到的程序开发问题。
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