一、类图
二、代码及界面
1 package triangle; 2 3 import java.awt.EventQueue; 4 import javax.swing.JFrame; 5 import javax.swing.JOptionPane; 6 import javax.swing.JPanel; 7 import java.awt.BorderLayout; 8 import javax.swing.JButton; 9 import javax.swing.JTextField; 10 import java.awt.Font; 11 import javax.swing.UIManager; 12 import java.awt.event.MouseAdapter; 13 import java.awt.event.MouseEvent; 14 import javax.swing.JLabel; 15 16 public class TtiangleFrame { 17 18 private JFrame frm; 19 private JTextField textField_b; 20 private JTextField textField_a; 21 private JTextField textField_c; 22 private JTextField textField_is; 23 private JTextField textField_area; 24 private JTextField textField_peri; 25 26 /** 27 * Launch the application. 28 */ 29 public static void main(String[] args) { 30 EventQueue.invokeLater(new Runnable() { 31 public void run() { 32 try { 33 TtiangleFrame window = new TtiangleFrame(); 34 window.frm.setVisible(true); 35 } catch (Exception e) { 36 e.printStackTrace(); 37 } 38 } 39 }); 40 } 41 42 /** 43 * Create the application. 44 */ 45 public TtiangleFrame() { 46 initialize(); 47 } 48 49 /** 50 * Initialize the contents of the frame. 51 */ 52 private void initialize() { 53 frm = new JFrame(); 54 frm.setBackground(UIManager.getColor("Button.background")); 55 frm.setFont(new Font("Dialog", Font.PLAIN, 12)); 56 frm.setForeground(UIManager.getColor("Button.background")); 57 frm.setTitle("Triangle"); 58 frm.setBounds(300, 200, 400, 250); 59 frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 60 61 JPanel panel = new JPanel(); 62 panel.setBounds(0, 0, 400, 250); 63 panel.setBackground(UIManager.getColor("Button.background")); 64 frm.getContentPane().add(panel, BorderLayout.CENTER); 65 66 JLabel label_title = new JLabel("u8BF7u8F93u5165u4E09u89D2u5F62u7684u4E09u6761u8FB9uFF1A"); 67 label_title.setBackground(UIManager.getColor("Button.background")); 68 label_title.setFont(new Font("宋体", Font.BOLD, 16)); 69 label_title.setBounds(20, 100, 200, 20); 70 panel.add(label_title); 71 72 JPanel panel_1 = new JPanel(); 73 panel.add(panel_1); 74 75 JLabel lblA = new JLabel("a:"); 76 panel_1.add(lblA); 77 lblA.setFont(new Font("宋体", Font.BOLD, 16)); 78 lblA.setSize(20, 20); 79 80 textField_a = new JTextField(); 81 panel_1.add(textField_a); 82 textField_a.setColumns(4); 83 84 JLabel lblB = new JLabel("b:"); 85 panel_1.add(lblB); 86 lblB.setFont(new Font("宋体", Font.BOLD, 16)); 87 lblB.setSize(20, 20); 88 89 textField_b = new JTextField(); 90 panel_1.add(textField_b); 91 textField_b.setColumns(4); 92 93 JLabel lblC = new JLabel("c:"); 94 panel_1.add(lblC); 95 lblC.setFont(new Font("宋体", Font.BOLD, 16)); 96 lblC.setSize(20, 20); 97 98 textField_c = new JTextField(); 99 panel_1.add(textField_c); 100 textField_c.setColumns(4); 101 102 JPanel panel_btn = new JPanel(); 103 panel_btn.setSize(200, 80); 104 panel.add(panel_btn); 105 106 JButton btnOK = new JButton("OK"); 107 btnOK.setSize(50, 50); 108 btnOK.setFont(new Font("宋体", Font.PLAIN, 15)); 109 panel_btn.add(btnOK); 110 111 JButton btnCancle = new JButton("Cancel"); 112 btnOK.setSize(50, 50); 113 btnCancle.setFont(new Font("宋体", Font.PLAIN, 15)); 114 panel_btn.add(btnCancle); 115 btnCancle.addMouseListener(new MouseAdapter() { 116 @Override 117 public void mouseClicked(MouseEvent arg0) { 118 Object object = arg0.getSource(); 119 if(object == btnCancle){ 120 textField_a.setText(""); 121 textField_b.setText(""); 122 textField_c.setText(""); 123 textField_is.setText(""); 124 textField_area.setText(""); 125 textField_peri.setText(""); 126 } 127 } 128 }); 129 btnOK.addMouseListener(new MouseAdapter() { 130 @Override 131 public void mouseClicked(MouseEvent arg0) { 132 Object object = arg0.getSource(); 133 if(object == btnOK){ 134 int i_a,i_b,i_c; 135 String a=textField_a.getText(); 136 String b=textField_b.getText(); 137 String c=textField_c.getText(); 138 if(Sort.IsNum(a)&&Sort.IsNum(b)&&Sort.IsNum(c)) 139 { 140 i_a = Integer.parseInt(a); 141 i_b = Integer.parseInt(b); 142 i_c = Integer.parseInt(c); 143 if (!(Sort.triangle(i_a, i_b, i_c)).equals("边的值不在范围内")&&!(Sort.triangle(i_a, i_b, i_c)).equals("不构成三角形")) { 144 String result=Sort.triangle(i_a, i_b, i_c); 145 textField_is.setText(result); 146 String area=String.valueOf(Sort.triangleArea(i_a, i_b, i_c)); 147 textField_area.setText(area); 148 String peri=String.valueOf(Sort.perimeter(i_a, i_b, i_c)); 149 textField_peri.setText(peri); 150 } 151 else{ 152 String result=Sort.triangle(i_a, i_b, i_c); 153 textField_is.setText(result); 154 textField_area.setText(""); 155 textField_peri.setText(""); 156 textField_peri.setText(""); 157 } 158 } 159 else{ 160 JOptionPane.showMessageDialog(null, "输入有误，请重请输入正确整数"); 161 new JFrame(); 162 textField_a.setText(""); 163 textField_b.setText(""); 164 textField_c.setText(""); 165 textField_is.setText(""); 166 textField_area.setText(""); 167 textField_peri.setText(""); 168 } 169 } 170 } 171 }); 172 173 JPanel panel_result1 = new JPanel(); 174 panel_result1.setBounds(0, 0, 400, 50); 175 panel.add(panel_result1); 176 177 JLabel j_is = new JLabel(); 178 panel_result1.add(j_is,BorderLayout.SOUTH); 179 j_is.setFont(new Font("宋体", Font.PLAIN, 16)); 180 j_is.setBackground(UIManager.getColor("Button.background")); 181 j_is.setText("u8FD9u4E2Au4E09u89D2u5F62u662FuFF1A"); 182 183 textField_is = new JTextField(); 184 textField_is.setFont(new Font("宋体", Font.PLAIN, 15)); 185 panel_result1.add(textField_is); 186 textField_is.setEditable(false); 187 textField_is.setColumns(15); 188 189 JPanel panel_result2 = new JPanel(); 190 panel.add(panel_result2); 191 192 JLabel j_area = new JLabel(); 193 panel_result2.add(j_area); 194 j_area.setFont(new Font("宋体", Font.PLAIN, 15)); 195 j_area.setBackground(UIManager.getColor("Button.background")); 196 j_area.setText("u9762u79EFu662FuFF1A"); 197 198 textField_area = new JTextField(); 199 textField_area.setFont(new Font("宋体", Font.PLAIN, 15)); 200 textField_area.setEditable(false); 201 panel_result2.add(textField_area); 202 textField_area.setColumns(8); 203 204 JLabel j_peri = new JLabel(); 205 panel_result2.add(j_peri); 206 j_peri.setFont(new Font("宋体", Font.PLAIN, 15)); 207 j_peri.setBackground(UIManager.getColor("Button.background")); 208 j_peri.setText("u5468u957Fu662FuFF1A"); 209 210 textField_peri = new JTextField(); 211 textField_peri.setFont(new Font("宋体", Font.PLAIN, 15)); 212 textField_peri.setEditable(false); 213 panel_result2.add(textField_peri); 214 textField_peri.setColumns(8); 215 216 } 217 218 }
1 package triangle; 2 3 import java.math.BigDecimal; 4 5 public class Sort{ 6 public static String triangle(int a,int b,int c){ 7 if(a<1 || a>100 ||b<1 || b>100|| c<1|| c>100) 8 { 9 return "边的值不在范围内"; 10 } 11 else if(a>=b+c ||b>=a+c||c>=a+b) 12 { 13 return "不构成三角形"; 14 } 15 else if(a==b &&b==c &&c==a){ 16 return "等边三角形"; 17 } 18 else if(a==b ||b==c ||c==a){ 19 return "等腰三角形"; 20 } 21 else if(a*a+b*b==c*c ||b*b+c*c==a*a ||c*c+a*a==b*b){ 22 return "直角三角形"; 23 } 24 else { 25 return "一般三角形"; 26 } 27 } 28 public static boolean IsNum(String str) 29 { 30 if(str==null) 31 { 32 return false; 33 } 34 else{ 35 try{ 36 @SuppressWarnings("unused") 37 int num=Integer.valueOf(str);//把字符串强制转换为数字 38 return true;//是数字,返回true 39 }catch (Exception e) { 40 return false; 41 } 42 } 43 } 44 public static int perimeter(int a,int b,int c){ 45 return a+b+c; 46 } 47 public static float triangleArea(int a,int b,int c){ 48 double p = ((a+b+c)*0.5); 49 float s= (float) (p*(p-a)*(p-b)*(p-c)); 50 float r=(float)Math.sqrt(s); 51 BigDecimal bigDecimal = new BigDecimal(r); 52 float f = bigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue(); 53 return f; 54 } 55 }
三、实验结果
