java中如何画三角形面积

在Java中，你可以使用图形用户界面库如Java Swing或JavaFX来绘制图形，包括三角形。以下是一个使用Java Swing绘制三角形并计算其面积的简单示例：

```java

import javax.swing.;

import java.awt.;

public class TriangleArea extends JPanel {

private static final long serialVersionUID = 1L;

private int x1, y1, x2, y2, x3, y3;

public TriangleArea(int x1, int y1, int x2, int y2, int x3, int y3) {

this.x1 = x1;

this.y1 = y1;

this.x2 = x2;

this.y2 = y2;

this.x3 = x3;

this.y3 = y3;