用java画三角形import javax.swing.*; import java.awt.*; import java.awt.event.*

import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.util.*;/** * 格子绘图演示 * @author hardneedl */final class Trang extends JFrame{ private static final Dimension SIZE = new Dimension(600,400); public Dimension getMinimumS