\u9898\u76ee 1 \u7b54\u6848<\/p>\n
class Circle {
\n private double radius;<\/p>\n
public Circle(double radius) {
\n this.radius = radius;
\n }<\/p>\n
public double getArea() {
\n return Math.PI * radius * radius;
\n }<\/p>\n
public static void main(String[] args) {
\n Circle circle = new Circle(5.0);
\n System.out.println("\u5706\u7684\u9762\u79ef\u4e3a：" + circle.getArea());
\n }
\n}<\/p>\n
\u9898\u76ee 2 \u7b54\u6848<\/p>\n
import java.util.Scanner;<\/p>\n
public class WeekdayCalculator {
\n public static void main(String[] args) {
\n Scanner scanner = new Scanner(System.in);
\n System.out.print("\u8bf7\u8f93\u5165\u6570\u5b57（1-7）：");
\n int num = scanner.nextInt();<\/p>\n
switch (num) {
\n case 1:
\n System.out.println("\u661f\u671f\u4e00");
\n break;
\n case 2:
\n System.out.println("\u661f\u671f\u4e8c");
\n break;
\n case 3:
\n System.out.println("\u661f\u671f\u4e09");
\n break;
\n case 4:
\n System.out.println("\u661f\u671f\u56db");
\n break;
\n case 5:
\n System.out.println("\u661f\u671f\u4e94");
\n break;
\n case 6:
\n System.out.println("\u661f\u671f\u516d");
\n break;
\n case 7:
\n System.out.println("\u661f\u671f\u65e5");
\n break;
\n default:
\n System.out.println("\u8f93\u5165\u9519\u8bef");
\n }
\n scanner.close();
\n }
\n}<\/p>\n
\u9898\u76ee 1 \u7b54\u6848<\/p>\n
public class CharCounter {
\n public static void main(String[] args) {
\n String[] strArray = {"apple", "banana", "grape", "orange", "kiwi"};<\/p>\n
for (String str : strArray) {
\n int count = 0;
\n for (int i = 0; i < str.length(); i++) {
\n if (str.charAt(i) == 'a' || str.charAt(i) == 'A') {
\n count++;
\n }
\n }
\n System.out.println("\u5b57\u7b26\u4e32 \\\\"" + str + "\\\\" \u4e2d 'a' \u51fa\u73b0\u6b21\u6570: " + count);
\n }
\n }
\n}<\/p>\n
\u9898\u76ee 2 \u7b54\u6848<\/p>\n
public class ArrayReverser {
\n public static void reverseArray(int[] nums) {
\n int left = 0;
\n int right = nums.length – 1;
\n while (left < right) {
\n int temp = nums[left];
\n nums[left] = nums[right];
\n nums[right] = temp;
\n left++;
\n right–;
\n }
\n }<\/p>\n
public static void main(String[] args) {
\n int[] nums = {12, 34, 56, 78, 90};
\n reverseArray(nums);
\n for (int num : nums) {
\n System.out.print(num + " ");
\n }
\n }
\n}<\/p>\n
\u9898\u76ee 1 \u7b54\u6848<\/p>\n
java<\/p>\n
class Animal {
\n private String name;<\/p>\n
public Animal(String name) {
\n this.name = name;
\n }<\/p>\n
public String getName() {
\n return name;
\n }
\n}<\/p>\n
class Dog extends Animal {
\n public Dog(String name) {
\n super(name);
\n }<\/p>\n
public void bark() {
\n System.out.println("\u6c6a\u6c6a\u6c6a");
\n }
\n}<\/p>\n
class Cat extends Animal {
\n public Cat(String name) {
\n super(name);
\n }<\/p>\n
public void meow() {
\n System.out.println("\u55b5\u55b5\u55b5");
\n }
\n}<\/p>\n
public class InheritanceDemo {
\n public static void main(String[] args) {
\n Dog dog = new Dog("\u65fa\u8d22");
\n Cat cat = new Cat("\u54aa\u54aa");<\/p>\n
System.out.println("\u72d7\u7684\u540d\u5b57：" + dog.getName());
\n dog.bark();<\/p>\n
System.out.println("\\\\n\u732b\u7684\u540d\u5b57：" + cat.getName());
\n cat.meow();
\n }
\n}<\/p>\n
\u9898\u76ee 2 \u7b54\u6848<\/p>\n
java<\/p>\n
class BankAccount {
\n private String accountNumber;
\n private double balance;<\/p>\n
public BankAccount(String accountNumber, double balance) {
\n this.accountNumber = accountNumber;
\n this.balance = balance;
\n }<\/p>\n
public void deposit(double amount) {
\n balance += amount;
\n }<\/p>\n
public void withdraw(double amount) {
\n if (balance >= amount) {
\n balance -= amount;
\n } else {
\n System.out.println("\u4f59\u989d\u4e0d\u8db3");
\n }
\n }<\/p>\n
public double getBalance() {
\n return balance;
\n }<\/p>\n
public String getAccountNumber() {
\n return accountNumber;
\n }
\n}<\/p>\n
class Customer {
\n private String customerName;
\n private BankAccount account;<\/p>\n
public Customer(String customerName, BankAccount account) {
\n this.customerName = customerName;
\n this.account = account;
\n }<\/p>\n
public void showAccountInfo() {
\n System.out.println("\u5ba2\u6237\u59d3\u540d：" + customerName);
\n System.out.println("\u8d26\u53f7：" + account.getAccountNumber());
\n System.out.println("\u4f59\u989d：" + account.getBalance());
\n }
\n}<\/p>\n
public class BankSystem {
\n public static void main(String[] args) {
\n BankAccount account = new BankAccount("123456", 1000.0);
\n Customer customer = new Customer("\u5f20\u4e09", account);<\/p>\n
customer.showAccountInfo();
\n account.deposit(500.0);
\n account.withdraw(200.0);
\n System.out.println("\\\\n\u64cd\u4f5c\u540e：");
\n customer.showAccountInfo();
\n }
\n}<\/p>\n
\u9898\u76ee\u7b54\u6848<\/p>\n
java<\/p>\n
import java.io.BufferedReader;
\nimport java.io.FileReader;
\nimport java.io.IOException;<\/p>\n
public class FileNumberProcessor {
\n public static void main(String[] args) {
\n int sum = 0;
\n int count = 0;
\n double average;<\/p>\n
try (BufferedReader reader = new BufferedReader(new FileReader("numbers.txt"))) {
\n String line;
\n while ((line = reader.readLine()) != null) {
\n try {
\n int num = Integer.parseInt(line.trim());
\n sum += num;
\n count++;
\n } catch (NumberFormatException e) {
\n System.out.println("\u6570\u636e\u683c\u5f0f\u9519\u8bef: " + line);
\n }
\n }
\n if (count == 0) {
\n System.out.println("\u6587\u4ef6\u4e2d\u6ca1\u6709\u6709\u6548\u6570\u5b57");
\n return;
\n }
\n average = (double) sum \/ count;
\n System.out.println("\u5e73\u5747\u503c\u4e3a：" + average);<\/p>\n
} catch (FileNotFoundException e) {
\n System.out.println("\u6587\u4ef6\u672a\u627e\u5230");
\n } catch (IOException e) {
\n System.out.println("\u8bfb\u53d6\u6587\u4ef6\u65f6\u51fa\u9519");
\n }
\n }
\n}<\/p>\n
\u7b54\u6848\u8bf4\u660e：<\/p>\n
\u5efa\u8bae\u5728 IDE \u4e2d\u8fd0\u884c\u65f6\u6ce8\u610f：<\/p>\n
\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee：\u4e00\u3001\u57fa\u7840\u8bed\u6cd5\u9898\u9898\u76ee 1：\u8981\u6c42：\u7f16\u5199\u4e00\u4e2a Java \u7a0b\u5e8f，\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3aCircle\u7684\u7c7b\u3002\u8be5\u7c7b\u5305\u542b\u4e00\u4e2a\u79c1\u6709\u6210\u5458\u53d8\u91cfradius（\u534a\u5f84），\u6570\u636e\u7c7b\u578b\u4e3adouble\u3002\u63d0\u4f9b\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\u7528\u4e8e\u521d\u59cb\u5316\u534a\u5f84\u3002\u7f16\u5199\u4e00\u4e2agetArea\u65b9\u6cd5，\u7528\u4e8e\u8ba1\u7b97\u5e76\u8fd4\u56de\u5706\u7684\u9762\u79ef（\u516c\u5f0f：S\u03c0r2，\u03c0\u53d6\u503c\u4e3aMath.PI）\u3002\u5728main\u65b9\u6cd5\u4e2d\u521b\u5efaCi<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,81,427],"topic":[],"class_list":["post-86986","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-python","tag-427"],"yoast_head":"\n