第4次作业类测试代码_061_陈小兰
1.类图：
2.结果：
3.代码
import java.awt.Color; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DecimalFormat; import javax.swing.JTextField; import javax.swing.JButton; public class TriangleJudge{ protected static final Object Submit = null; protected static final Object Cancle = null; private JFrame frame; private JTextField SideaText; private JTextField SidebText; private JTextField SidecText; private JTextField TypeText; private JTextField AreaText; private JTextField PerimeterText; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { TriangleJudge window = new TriangleJudge(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the application. */ public TriangleJudge() { initialize(); } /** * Initialize the contents of the frame. */ private void initialize() { frame = new JFrame("三角形判断程序"); frame.setBounds(100, 100, 450, 350); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(null); JLabel titleLabel = new JLabel("请输入三角形的三条边："); titleLabel.setFont(new Font("宋体",Font.BOLD,15)); titleLabel.setBounds(21, 10, 270, 26); frame.getContentPane().add(titleLabel); JLabel Sidea = new JLabel("a："); Sidea.setFont(new Font("宋体", Font.PLAIN, 13)); Sidea.setBounds(31, 46, 54, 15); frame.getContentPane().add(Sidea); SideaText = new JTextField(); SideaText.setBounds(56, 46, 66, 21); frame.getContentPane().add(SideaText); SideaText.setColumns(10); JLabel Sideb = new JLabel("b："); Sideb.setFont(new Font("宋体", Font.PLAIN, 13)); Sideb.setBounds(157, 49, 54, 15); frame.getContentPane().add(Sideb); SidebText = new JTextField(); SidebText.setColumns(10); SidebText.setBounds(187, 46, 66, 21); frame.getContentPane().add(SidebText); JLabel Sidec = new JLabel("c："); Sidec.setFont(new Font("宋体", Font.PLAIN, 13)); Sidec.setBounds(304, 49, 54, 15); frame.getContentPane().add(Sidec); SidecText = new JTextField(); SidecText.setColumns(10); SidecText.setBounds(325, 43, 66, 21); frame.getContentPane().add(SidecText); JButton OK = new JButton("OK"); OK.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if(e.getSource()==OK) { String strs_a = SideaText.getText(); String strs_b = SidebText.getText(); String strs_c = SidecText.getText(); Triangle triangle = new Triangle(); //当输入满足条件 if (triangle.isNumber(strs_a)&&triangle.isNumber(strs_b)&&triangle.isNumber(strs_c)) { //将字符型转变为整数型 int s_a = Integer.parseInt(strs_a); int s_b = Integer.parseInt(strs_b); int s_c = Integer.parseInt(strs_c); //计算结果 String Type = triangle.triangle(s_a, s_b, s_c); float Area = triangle.triangleArea(s_a, s_b, s_c); int Perimeter = triangle.perimeter(s_a, s_b, s_c); //设置内容 TypeText.setText(String.valueOf(Type)); AreaText.setText(String.valueOf(Area)); PerimeterText.setText(String.valueOf(Perimeter)); } else { JOptionPane.showMessageDialog(null, "输入有误，请重请输入正确整数"); new JFrame(); SideaText.setText(""); SidebText.setText(""); SidecText.setText(""); } } } }); OK.setBounds(65, 92, 93, 23); frame.getContentPane().add(OK); JButton Cancel = new JButton("Cancel"); Cancel.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if(e.getSource()==Cancel) { SideaText.setText(""); SidebText.setText(""); SidecText.setText(""); TypeText.setText(""); AreaText.setText(""); PerimeterText.setText(""); } } }); Cancel.setBounds(233, 92, 93, 23); frame.getContentPane().add(Cancel); JLabel Typelable = new JLabel("这个三角形是："); Typelable.setBounds(23, 146, 150, 29); frame.getContentPane().add(Typelable); JLabel Arealabel = new JLabel("面积是："); Arealabel.setBounds(56, 184, 150, 29); frame.getContentPane().add(Arealabel); JLabel Perimeterlabel = new JLabel("周长是："); Perimeterlabel.setBounds(56, 221, 150, 29); frame.getContentPane().add(Perimeterlabel); TypeText = new JTextField(); TypeText.setBounds(125, 153, 200, 23); frame.getContentPane().add(TypeText); TypeText.setColumns(10); TypeText.setEnabled(false); TypeText.setDisabledTextColor(Color.BLACK); AreaText = new JTextField(); AreaText.setColumns(10); AreaText.setBounds(125, 191, 200, 23); frame.getContentPane().add(AreaText); AreaText.setEnabled(false); AreaText.setDisabledTextColor(Color.BLACK); PerimeterText = new JTextField(); PerimeterText.setColumns(10); PerimeterText.setBounds(125, 226, 200, 23); frame.getContentPane().add(PerimeterText); PerimeterText.setEnabled(false); PerimeterText.setDisabledTextColor(Color.BLACK); } }
import java.util.Scanner; public class Triangle { //判断是否输入的是整数 public boolean isNumber(String num) { if (!num.matches("^[0-9]*$")) { return false; } return true; } //判断三角形的类型 public static String triangle(int a, int b, int c) { String s = null; if ((a < 1 || a > 100) || (b < 1 || b > 100) || (c < 1 || c > 100)) { s = "边的值不在范围内！"; } else if (a < b + c && b < a + c && c < a + b) {// 两边之和大于第三边可构成三角形 if (a == b || a == c || b == c) {// 等腰三角形 if (a == b && b == c) {// 等边三角形 s = "可以组成等边三角形"; } else { s = "可以组成等腰三角形"; } } else if (a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a) {//直角三角形 s="可以组成直角三角形"; } else s = "可以组成普通三角形"; } // 不能构成三角形 else{ s = "不能够组成三角形!"; } return s; } //计算面积 public static float triangleArea(int a,int b,int c) { double l=(a+b+c)*0.5; return (float)Math.sqrt(l*(l-a)*(l-b)*(l-c)); } //计算周长 public static int perimeter(int a,int b,int c) { return a+b+c; } }
