3个问题：
Menu2的扫描仪下输入Menu1：如何订购所有可能的案例，包括例外？import java.util。*;
公共类ScannerShape {
public static void printCalc() {
ArrayList<Shape> list = new ArrayList <Shape> ();
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i)+"Area: "+list.get(i).calcArea()+" Circumference: "+list.get(i).calcCircumference());
}
}
public static void printMenu1() {
System.out.println( "1. Add new shape\r\n" +
"2. List all shapes\r\n" +
"3. Sum all circumferences\r\n" +
"4. Sum all areas\r\n" +
"5. Find biggest circumference\r\n" +
"6. Find biggest area\n" +
"7. Exit" +
"Enter a number from the list above");
}
public static void printMenu2() {
System.out.println( "1. Square\r\n" +
"2. Rectangle\r\n" +
"3. Circle\r\n" +
"4. Right triangle\r\n" +
"Enter a number from the list above");
}
public static void main (String[] args) {
int i = 0;
int val, val1 = 0;
@SuppressWarnings("resource")
Scanner sc = new Scanner(System.in);
printMenu1();
while (true) {
val=sc.nextInt();
if (val == 7) {
System.out.println("Exit");
break;
}
if (val == 1)
printMenu2();
val=sc.nextInt();
if (val == 1)
System.out.println("Enter Square width");
val=sc.nextInt();
ArrayList<Shape> list = new ArrayList <Shape> ();
list.add(new Square(val));
printCalc();
if (val == 2) {
System.out.println("Enter Rectangle height");
val=sc.nextInt();
System.out.println("Enter Rectangle width");
val=sc.nextInt();
val1=sc.nextInt();
list.add(new Rectangle(val,val1));
printCalc();
}
if (val == 3) {
System.out.println("Enter Circle radius");
val=sc.nextInt();
list.add(new Circle(val));
printCalc();
}
if (val == 4) {
System.out.println("Enter Right triangle height");
val=sc.nextInt();
System.out.println("Enter Right triangle width");
val1=sc.nextInt();
list.add(new Triangle(val,val1));
printCalc();
}
if (val1 == 2) {
System.out.println("2. List all shapes");
printCalc();
val1=sc.nextInt();
}
if (val1 == 3) {
System.out.println("3. Sum all circumferences");
for (int i1 = 0; i1 < list.size(); i1++) {
for (int i2 = 0; i2 < list.size(); i2++) {
list.get(i1).calcCircumference();
}
}
System.out.println(list.get(i)+" Circumference: "+ list.get(i).calcCircumference());
val1=sc.nextInt();
}
if (val1 == 4) {
System.out.println("4. Sum all areas");
val1=sc.nextInt();
}
if (val1 == 5) {
System.out.println("5. Find biggest circumference");
val1=sc.nextInt();
}
if (val1 == 6) {
System.out.println("6. Find biggest area");
val1=sc.nextInt();
}
}
}
}
这个版本正在运行：
import java.util。*;
公共类ShapesScanner {
public static void main (String[] args) {
boolean shouldExit = false;
while (!shouldExit) {
printMainMenu();
int menuSelection = sc.nextInt();
if (shapes.size() == 0 && menuSelection != 1) {
System.out.println("Error: Shape or parameter was not selected or selected no one;");
continue;
}
switch (menuSelection) {
case 1:
printAddShapeMenu();
addShape(sc.nextInt());
break;
case 2: {
for (Shape sh : shapes) {
sh.toString(); // Print List of all entered Shapes;
}
} break;
case 3: {
double sum = 0;
for (Shape sh : shapes) {
sum += sh.calcCircumference();
}
System.out.println("Sum all circumferences: "+ sum + "\n");
} break;
case 4: {
double sum = 0;
for (Shape sh : shapes) {
sum += sh.calcArea();
}
System.out.println("Sum all areas: "+ sum + "\n");
} break;
case 5: {
double max = Double.MIN_VALUE;
double min = Double.MAX_VALUE;
for (Shape sh : shapes) {
double num = sh.calcCircumference();
min = Math.min(min, num);
max = Math.max(max, num);
}
System.out.println("Biggest circumference: " + max + "\n");
System.out.println("Min circumference: " + min + "\n");
} break;
case 6: {
double max = Double.MIN_VALUE;
double min = Double.MAX_VALUE;
for (Shape sh : shapes) {
Double num = sh.calcArea();
min = Math.min(min, num);
max = Math.max(max, num);
}
System.out.println("Biggest area: " + max + "\n");
System.out.println("Min area: " + min + "\n");
} break;
case 7: {
System.out.println("Exit");
shouldExit = true;
}
break;
}
}
}
// printMainMenu(), printAddShapeMenu(), addShape(int shapeNum) - print menus, add Shapes, enter the Shape parameters and save;
private static Scanner sc = new Scanner(System.in);
private static ArrayList<Shape> shapes = new ArrayList<Shape>(); // Save all entered Shapes;
public static void printMainMenu() {
System.out.println( "\n1. Add new shape\n" +
"2. List all shapes\n" +
"3. Sum all circumferences\n" +
"4. Sum all areas\n" +
"5. Find biggest circumference\n" +
"6. Find biggest area\n" +
"7. Exit" + "\nEnter a number from the list above\n");
}
public static void printAddShapeMenu() {
System.out.println( "\n1. Square\n" +
"2. Rectangle\n" +
"3. Circle\n" +
"4. Right triangle\n" +
"Enter a number from the list above\n");
}
public static void addShape(int shapeNum) {
switch (shapeNum) {
case 1: {
System.out.println("Enter width");
double width = sc.nextDouble();
shapes.add(new Square(width)); // Save all Square parameters;
break;
}
case 2: {
System.out.println("Enter width and height");
double width = sc.nextDouble();
double height = sc.nextDouble();
shapes.add(new Rectangle(height,width)); // Save all Rectangle parameters;
break;
}
case 3: {
System.out.println("Enter radius");
double radius = sc.nextDouble();
shapes.add(new Circle(radius)); // Save all Circle parameters;
break;
}
case 4:
System.out.println("Enter width and height");
double width = sc.nextDouble();
double height = sc.nextDouble();
shapes.add(new Triangle(width, height)); // Save all Triangle parameters;
break;
default:
System.out.println("Invalid shape specified");
}
}
}