//这是驱动程序，有一些资源类称为/已使用
ignorethiswriteline忽略这条线忽略这条线忽略此文字线
import java.util.Scanner;
public class KI23CriclesDriver
{
public static void main (String[] args)
{
//Declare Variables
int x1, y1, x2, y2;
String print;
double center;
double center2;
String radius;
int validLength = 1;
int validLength2 = 2;
//Instantiate Objects
KI23GetC gc = new KI23GetC();
KI23GetCircles gs = new KI23GetCircles();
KI23PrintC p = new KI23PrintC();
System.out.println("Do you want to enter (Option 1) center and radius or (Option 2) end points of diameter?");
x1 = 0;
y1 = 0;
x2 = 0;
y2 = 0;
Scanner scanner = new Scanner(System.in);
radius = scanner.nextLine();
if( radius.length() == validLength )
{
System.out.println("Please enter the center and radius");
x2 = gc.getX();
y2 = gc.getY();
x1 = gc.getX();
y1 = gc.getY();
center = gs.getCenter(x1, y1, x2, y2);
center2 = gs.getCenter2(x1, y1, x2, y2);
p.print(x1, y1, x2, y2, center, center2);
}
if( radius.length() == validLength2) // doesnt work since validlength2 is the same as validlength
{
System.out.println("Please enter the end points of diameter");
x1 = gc.getX();
y1 = gc.getY();
x2 = gc.getX();
y2 = gc.getY();
center = gs.getCenter(x1, y1, x2, y2);
center2 = gs.getCenter2(x1, y1, x2, y2);
p.print(x1, y1, x2, y2, center, center2);
}
else
{
System.out.println("Please enter 1 or 2");
x1 = 0;
y1 = 0;
x2 = 0;
y2 = 0;
radius = scanner.nextLine();
}
//
//我想要一个更好的方法来接受输入并对此做出不同的决策和计算}}
您显然没有显示该类和其他类的所有代码，因此下面的示例代码基本上在一定程度上利用了您提供的内容。提示被分解，并在特定的类方法中提供。 main（）方法仅调用另一个实际上开始滚球的方法（可以这么说）。这样做是为了避免需要静电。
startApp（）方法调用mainMenu（）方法，该方法又显示此控制台应用程序的主菜单。菜单包含在循环中，以确保用户正确输入。
从主菜单中选择的选项从mainMenu（）方法返回为整数值，然后该整数值落入switch / case块的控制之下，该块又确定中心和半径（菜单项1）将被提供，或者圆弧终点（菜单项[[2）将被提供。
如果要提供中心和半径，则将调用getCenterAndRadius（）
方法，该方法提示用户提供中心值和半径值。如果要提供圆弧终点，则调用getCircleEndPoints（）
方法，该方法提示用户提供所有四个值（x1，y1，x2，y2）以组成两个所需的终点圈子。还提供了[[一种名为getCenterAndRadius_2（）的附加方法，该方法演示了允许用户提供端点值的另一种方法。使用最适合您的方法，或者根据代码中给出的一些想法创建自己的方法。Regular Expressions的使用在提供的代码中使用。 String#matches()，String#split()和String#replaceAll()方法利用这些正则表达式。
import java.util.Scanner;
public class KI23CriclesDriver {
// KI23GetC gc = new KI23GetC();
// KI23GetCircles gs = new KI23GetCircles();
// KI23PrintC p = new KI23PrintC();
private final Scanner userInput = new Scanner(System.in);
private final String ls = System.lineSeparator();
private int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
public static void main(String[] args) {
// Done this way to avoid statics
new KI23CriclesDriver().startApp(args);
}
private void startApp(String[] args) {
int menuOption = mainMenu();
switch (menuOption) {
case 1:
getCenterAndRadius();
break;
case 2:
getCircleEndPoints();
// getCircleEndPoints_2();
break;
}
}
private int mainMenu() {
int menuChoice = 0;
while (menuChoice == 0) {
System.out.println("Supply a circle creation option:");
System.out.println(" 1) Based on Center and Radius." + ls
+ " 2) Based on Diameter End Points.");
System.out.print("Choice: --> ");
String choice = userInput.nextLine().trim();
if (choice.toLowerCase().startsWith("q")) {
// Quit appplication
System.exit(0);
}
if (!choice.matches("[12]")) {
System.err.println("Invalid menu choice! Try again..." + ls);
continue;
}
menuChoice = Integer.parseInt(choice);
}
return menuChoice;
}
private void getCenterAndRadius() {
System.out.println("Please enter the Center and Radius:");
String center = "", radius = "";
// Center
while (center.equals("")) {
System.out.print("Center Value: --> ");
center = userInput.nextLine();
if (!center.matches("\\d+")) {
System.err.println("Invalid entry for CENTER! Try again...");
center = "";
}
}
// Radius
while (radius.equals("")) {
System.out.print("Radius Value: --> ");
radius = userInput.nextLine();
if (!radius.matches("\\d+")) {
System.err.println("Invalid entry for RADIUS! Try again...");
radius = "";
}
}
System.out.println(new StringBuffer("").append("Center = ").append(center)
.append(" | Radius = ").append(radius));
/* Do what you want here with the numerical values
contained within the String variables center and
radius.
*/
}
private void getCircleEndPoints() {
System.out.println("Please enter the Circle End Points:");
String xx1 = "", yy1 = "", xx2 = "", yy2 = "";
// x1
while (xx1.equals("")) {
System.out.print("x1 Value: --> ");
xx1 = userInput.nextLine();
if (!xx1.matches("\\d+")) {
System.err.println("Invalid entry for x1! Try again...");
xx1 = "";
}
}
// y1
while (yy1.equals("")) {
System.out.print("y1 Value: --> ");
yy1 = userInput.nextLine();
if (!yy1.matches("\\d+")) {
System.err.println("Invalid entry for y1! Try again...");
yy1 = "";
}
}
// x2
while (xx2.equals("")) {
System.out.print("x2 Value: --> ");
xx2 = userInput.nextLine();
if (!xx2.matches("\\d+")) {
System.err.println("Invalid entry for x2! Try again...");
xx2 = "";
}
}
// y2
while (yy2.equals("")) {
System.out.print("y2 Value: --> ");
yy2 = userInput.nextLine();
if (!yy2.matches("\\d+")) {
System.err.println("Invalid entry for y2! Try again...");
yy2 = "";
}
}
System.out.println(new StringBuffer("").append("Circle End Points Suplied: (")
.append(xx1).append(",").append(yy1).append("), (")
.append(xx2).append(",").append(yy2).append(")"));
/* Do what you want here with the numerical values
contained within the String variables xx1, yy1,
xx2, and yy2.
*/
}
private void getCircleEndPoints_2() {
System.out.println("Please enter the Circle End Points:" + ls
+ "Example Entries: 50 50 65 72 or" + ls
+ " 50,50,65,72 or" + ls
+ " 50, 50, 65, 72");
int xx1, yy1, xx2, yy2;
String endPoints = "";
while (endPoints.equals("")) {
System.out.print("End Points: --> ");
endPoints = userInput.nextLine();
if (!endPoints.replaceAll("[ ,]","").matches("\\d+") ||
endPoints.contains(",") ? endPoints.split("\\s{0,},\\s{0,}").length != 4
: endPoints.split("\\s+").length != 4) {
System.err.println("Invalid End Points Entry! Try again...");
endPoints = "";
}
}
String[] points = endPoints.contains(",") ?
endPoints.split("\\s{0,},\\s{0,}") :
endPoints.split("\\s+");
xx1 = Integer.parseInt(points[0]);
yy1 = Integer.parseInt(points[1]);
xx2= Integer.parseInt(points[2]);
yy2 = Integer.parseInt(points[3]);
System.out.println(new StringBuffer("").append("Circle End Points Suplied: (")
.append(xx1).append(",").append(yy1).append("), (")
.append(xx2).append(",").append(yy2).append(")"));
/* Do what you want here with the numerical values
contained within the int type variables xx1, yy1,
xx2, and yy2.
*/
}
}
代码中使用的正则表达式：
if (!choice.matches("[12]")) {
matches（）
"[12]"表达式基本上表示以下含义：如果
choice变量中包含的提供的字符串为not “ 1”或“ 2”，然后输入if代码块。if (!center.matches("\\d+")) {
"\\d+"表达式基本上表示以下含义：如果center
not字符串表示一个或多个数字（0到9），然后输入if代码块。 您可以在多个地方看到此表达式。endPoints.replaceAll("[ ,]", "")
replaceAll（）
方法中的"[ ,]"表达式意味着从all空格（“”）和逗号（，）。
此处包含在[[split（）endPoints.split("\\s+")
此处["\\s+"表达式表示：根据一个或多个空格（“”）分隔符，将endPoints变量中包含的字符串拆分为一个字符串数组
变量中的字符串拆分为字符串数组逗号/空格组合定界符（例如：“，”或“，”或“，”或“，”），而不考虑逗号两侧的空格数（如果有）。它基本上涵盖了使用逗号分隔符的所有基础。 endPoints.split("\\s{0,},\\s{0,}")
"\\s{0,},\\s{0,}"表达式意味着：将基于逗号（“，”）分隔符或any]包含在endPoints根据需要修改代码。