学步园

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

public class TestTriangle extends JFrame {

	JLabel title;
	JLabel first;
	JLabel second;
	JLabel third;

	JTextField firstL;
	JTextField secondL;
	JTextField thirdL;

	JButton button;

	public TestTriangle() {
		
	    //JOptionPane joption = new JOptionPane();

		title = new JLabel();
		title.setText("三角形判定问题");

		first = new JLabel();
		first.setText("第一个参数");
		firstL = new JTextField();

		second = new JLabel();
		second.setText("第二个参数");
		secondL = new JTextField();

		third = new JLabel();
		third.setText("第三个参数");
		thirdL = new JTextField();

		button = new JButton();
		button.setText("判断");

		this.add(title);
		this.add(first);
		this.add(firstL);
		this.add(second);
		this.add(secondL);
		this.add(third);
		this.add(thirdL);

		this.add(button);
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int a = Integer.parseInt(firstL.getText());
				int b = Integer.parseInt(secondL.getText());
				int c = Integer.parseInt(thirdL.getText());

				if (!(a + b <= c || a + c <= b || b + c <= a)
						&& (a >= 1 && a <= 100) && (b >= 1 && b <= 100)
						&& (c >= 1 && c <= 100)) {

					if (a == b && a == c)
						JOptionPane.showMessageDialog(null, "等边三角形");

					else if (a == b || a == c || b == c)
						JOptionPane.showMessageDialog(null, "等腰三角形");
					else
						JOptionPane.showMessageDialog(null , "一般三角形");
				} else {
					if (a < 1 || a > 100)
						JOptionPane.showMessageDialog(null , "a不在范围内，不满足条件1,不能构成三角形");
					else if (b < 1 || b > 100)
						JOptionPane.showMessageDialog(null , "b不在范围内，不满足条件2,不能构成三角形");
					else if (c < 1 || c > 100)
						JOptionPane.showMessageDialog(null , "c不在范围内，不满足条件3,不能构成三角形");
					else if (a >= b + c)
						JOptionPane.showMessageDialog(null , "不满足a<b+c,不能构成三角形");
					else if (b >= a + c)
						JOptionPane.showMessageDialog(null , "不满足b<a+c,不能构成三角形");
					else if (c >= b + a)
						JOptionPane.showMessageDialog(null , "不满足c<a+b,不能构成三角形");
				}
				JOptionPane.showMessageDialog(null , "判断结束！");

			}
		});

		this.setLayout(new GridLayout());
		this.setSize(600, 300);
		this.setLocation(500, 300);
		this.setVisible(true);
	}

	public static void main(String[] args) {
		TestTriangle testTriangle = new TestTriangle();
	}

}