第4次作业类测试代码+052+张博勋
1.类图
2.代码
三角形demo类：
package zbx_ruance4;
import java.util.*;
public class Demo {
public static String triangle(int a,int b,int c){
String result;
if( a>=1 &&a<=100&&b>=1&&b<=100&&c>=1&&c<=100){
if(a<b+c &&b<a+c&& c<a+b){
if(a==b || a==c||b==c){
if(a==b &&b==c&&a==c)
result = "等边三角形";
else
result = "等腰三角形";
}else if(a*a+b*b==c*c || b*b+c*c==a*a || a*a+c*c==b*b){
result = "直角三角形";
}else{
result = "一般三角形";
}
}else{
result = "不构成三角形";
}
}else{
result = "边的值不在范围内！";
}
return result;
}
public static void main(String[] args) {
System.out.println("设计三角形问题的程序");
Scanner sc=new Scanner(System.in);
while(true)
{
try{
System.out.println("请输入三角形的三条边：");
int a=sc.nextInt();
int b=sc.nextInt();
int c=sc.nextInt();
System.out.println(triangle(a,b,c));
}catch(Exception e){
e.printStackTrace();
}
}
}
public boolean Validation(String[] value){
if(value.length<3){//输入数据不是3个
return false;
}
try {
for(int i=0;i<3;i++){
int b = Integer.valueOf(value[i]).intValue();
}
} catch (NumberFormatException e){//整形转换异常
return false;
}
return true;
}
public int perimeter(int a,int b,int c){
return a+b+c;
}
public float triangleArea(int a,int b,int c){
float s = (float) (0.5*perimeter( a, b, c));
return (float) Math.sqrt((s*(s-a)*(s-b)*(s-c)));
}
}
测试窗体类：Frame
package zbx_ruance4;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import zbx_ruance4.Demo;
import javax.swing.JFrame;
public class Frame{
private JFrame frame;
private final JLabel label = new JLabel("请输入三角形三边：");
private final JLabel lab_a = new JLabel("请输入a:");
private final JLabel lab_b = new JLabel("请输入b:");
private final JLabel lab_c = new JLabel("请输入c:");
private final JLabel result_1 = new JLabel("");
private final JLabel result_2 = new JLabel("面积是： 周长是：");
private final JTextField text_a = new JTextField();
private final JTextField text_b = new JTextField();
private final JTextField text_c = new JTextField();
private final JButton btn_ok = new JButton("确定");
private final JButton btn_clean = new JButton("清空");
private Demo tri;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
new Frame();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Frame() {
frame = new JFrame("三角形计算程序");
frame.setBounds((Toolkit.getDefaultToolkit().getScreenSize().width/2)-256, (Toolkit.getDefaultToolkit().getScreenSize().height/2)-192, 450, 360);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setVisible(true);
frame.setResizable(false);
label.setFont(new Font("体", Font.PLAIN, 14));
label.setBounds(24, 10, 350, 30);
frame.getContentPane().add(label);
result_1.setFont(new Font("宋体", Font.PLAIN, 14));
result_1.setBounds(24, 192, 350, 30);
frame.getContentPane().add(result_1);
result_2.setFont(new Font("宋体", Font.PLAIN, 14));
result_2.setBounds(24, 254, 350, 30);
frame.getContentPane().add(result_2);
lab_a.setFont(new Font("宋体", Font.PLAIN, 14));
lab_a.setBounds(60, 70, 60, 25);
lab_b.setFont(new Font("宋体", Font.PLAIN, 14));
lab_b.setBounds(60, 100, 60, 25);
lab_c.setFont(new Font("宋体", Font.PLAIN, 14));
lab_c.setBounds(60, 130, 60, 25);
frame.getContentPane().add(lab_a);
frame.getContentPane().add(lab_b);
frame.getContentPane().add(lab_c);
text_a.setBounds(200, 70, 60, 25);
text_b.setBounds(200, 100, 60, 25);
text_c.setBounds(200, 130, 60, 25);
text_a.setColumns(10);
text_b.setColumns(10);
text_c.setColumns(10);
frame.getContentPane().add(text_a);
frame.getContentPane().add(text_b);
frame.getContentPane().add(text_c);
btn_ok.setBounds(110, 180, 95, 25);
frame.getContentPane().add(btn_ok);
btn_clean.setBounds(240, 180, 95, 25);
frame.getContentPane().add(btn_clean);
btn_ok.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
if(arg0.getSource()==btn_ok){
tri = new Demo();
String[] value = new String[3];
value[0] = text_a.getText();
value[1] = text_b.getText();
value[2] = text_c.getText();
if(!tri.Validation(value)){//调用验证函数捕获异常
JOptionPane.showMessageDialog(null, "请确保输入的边为整数！", "错误", JOptionPane.ERROR_MESSAGE);
allClean();
}
else{
int a = Integer.valueOf(value[0]).intValue();
int b = Integer.valueOf(value[1]).intValue();
int c = Integer.valueOf(value[2]).intValue();
String triangleType = tri.triangle(a,b,c);
result_1.setText(triangleType);
if(triangleType.equals("边的值不在范围内！")){
JOptionPane.showMessageDialog(null, "边的值不在范围内！", "错误", JOptionPane.ERROR_MESSAGE);
allClean();
}else if(triangleType.equals("不能构成三角形.")){
JOptionPane.showMessageDialog(null, "不能构成三角形.", "错误", JOptionPane.ERROR_MESSAGE);
allClean();
}else{
result_2.setText("面积是："+tri.triangleArea(a, b, c)+" 周长是："+tri.perimeter(a, b, c));
}
}
}
}
});
btn_clean.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0){
if(arg0.getSource()==btn_clean){
allClean();//qingkong
}
}
});
}
private void allClean(){
text_a.setText("");
text_b.setText("");
text_c.setText("");
result_1.setText("类型：");
result_2.setText("面积是： 周长是：");
}
}
3.
