期中考

import java.awt.event.*;

import javax.swing.*;

public class TriangleMethod extends JFrame

implements ActionListener {

private JButton button;

private JPanel panel;

public static int a1,a2,b1,b2;

public static void main(String[] args)

{

a1 = Integer.parseInt(args[0]);

a2 = Integer.parseInt(args[1]);

b1 = Integer.parseInt(args[2]);

b2 = Integer.parseInt(args[3]);

TriangleMethod frame = new TriangleMethod();

frame.setSize(350, 300);

frame.createGUI();

frame.setVisible(true);

}

private void createGUI() {

setDefaultCloseOperation(EXIT_ON_CLOSE);

Container window = getContentPane();

window.setLayout(new FlowLayout() );

panel = new JPanel();

panel.setPreferredSize(new Dimension(300, 200));

panel.setBackground(Color.white);

window.add(panel);

button = new JButton("Press me");

window.add(button);

button.addActionListener(this);

}

public void actionPerformed(ActionEvent event) {

Graphics paper = panel.getGraphics();

drawLogo(paper, 10, 20);

//drawLogo(paper, 100, 100);

//drawTriangle(paper, 100, 10, 40, 40);

drawTriangle(paper, 10, 100, a1, a2);

}

private void drawLogo(Graphics drawingArea,

int xPos, int yPos) {

drawingArea.drawRect(xPos, yPos, b1, b2);

//drawingArea.drawRect(xPos, yPos, 40, 40);

//drawingArea.drawRect(xPos, yPos, 20, 20);

}

private void drawTriangle(Graphics drawingArea,

int xPlace,

int yPlace,

int width,

int height) {

drawingArea.drawLine(xPlace, yPlace,