想要一些简单的Java代码

输出Hello World

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

计算两个数的和

import java.util.Scanner;

public class AddTwoNumbers {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the first number: ");
        int num1 = input.nextInt();
        System.out.print("Enter the second number: ");
        int num2 = input.nextInt();
        int sum = num1 + num2;
        System.out.println("The sum of the two numbers is: " + sum);
    }
}

判断一个数是否是偶数

import java.util.Scanner;

public class CheckEvenNumber {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = input.nextInt();
        if (num % 2 == 0) {
            System.out.println(num + " is an even number");
        } else {
            System.out.println(num + " is an odd number");
        }
    }
}

打印乘法表

public class MultiplicationTable {
    public static void main(String[] args) {
        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + "x" + i + "=" + (i * j) + "\t");
            }
            System.out.println();
        }
    }
}

求一个数的阶乘

import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = input.nextInt();
        int factorial = 1;
        for (int i = num; i >= 1; i--) {
            factorial *= i;
        }
        System.out.println(num + "! = " + factorial);
    }
}