原文： https://beginnersbook.com/2014/01/java-program-to-calculate-area-of-triangle/
在这里，我们将看到如何计算三角形的面积。我们将看到以下两个程序：
1）程序 1：提示用户输入三角形的基本宽度和高度。
2）程序 2：无用户交互：程序本身指定了宽度和高度。
计划 1：
/**
* @author: BeginnersBook.com
* @description: Program to Calculate area of Triangle in Java
* with user interaction. Program will prompt user to enter the
* base width and height of the triangle.
*/
import java.util.Scanner;
class AreaTriangleDemo {
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the width of the Triangle:");
double base = scanner.nextDouble();
System.out.println("Enter the height of the Triangle:");
double height = scanner.nextDouble();
//Area = (width*height)/2
double area = (base* height)/2;
System.out.println("Area of Triangle is: " + area);
}
}输出：
Enter the width of the Triangle:
2
Enter the height of the Triangle:
2
Area of Triangle is: 2.0计划 2：
/**
* @author: BeginnersBook.com
* @description: Program to Calculate area of Triangle
* with no user interaction.
*/
class AreaTriangleDemo2 {
public static void main(String args[]) {
double base = 20.0;
double height = 110.5;
double area = (base* height)/2;
System.out.println("Area of Triangle is: " + area);
}
}输出：
Area of Triangle is: 1105.0