我必须为一个程序编写两种方法,当用户提示宽度和高度时,计算矩形的面积和周长? import java.util.Scanner; 公共类交互矩形 { 公共静态void main(字符串[]args) { int height=readPositiveInteger(“输入高度”); int width=readPositiveInteger(“输入宽度”); 打印矩形细节(高度、宽度); } /** *读入整数并返回其值 *@param要向用户显示的提示 */ 公共静态int readInteger(字符串提示) { 扫描仪扫描=新扫描仪(System.in); System.out.println(提示); while(!scan.hasnetint())//当存在非整数时。。。 { scan.next();/…读取并放弃输入,然后再次提示 System.out.println(“输入错误。输入整数”); } int firstInteger=scan.nextInt(); 返回第一个整数; } /** *读入大于0的整数并返回其值 *@param要向用户显示的提示 */ 公共静态int readPositiveInteger(字符串提示) { int输入=0; 扫描仪扫描=新扫描仪(System.in); 布尔优先=假; 而(!scan.hasnetint()) { int数量=scan.nextInt(); 如果(数量>0) { 第一个=正确; 数量=scan.nextInt(); } 否则,如果(数量
用于授权您的代码至少执行一次,然后询问用户是否希望再次计算结果我必须为一个程序编写两种方法,当用户提示宽度和高度时,计算矩形的面积和周长? import java.util.Scanner; 公共类交互矩形 { 公共静态void main(字符串[]args) { int height=readPositiveInteger(“输入高度”); int width=readPositiveInteger(“输入宽度”); 打印矩形细节(高度、宽度); } /** *读入整数并返回其值 *@param要向用户显示的提示 */ 公共静态int readInteger(字符串提示) { 扫描仪扫描=新扫描仪(System.in); System.out.println(提示); while(!scan.hasnetint())//当存在非整数时。。。 { scan.next();/…读取并放弃输入,然后再次提示 System.out.println(“输入错误。输入整数”); } int firstInteger=scan.nextInt(); 返回第一个整数; } /** *读入大于0的整数并返回其值 *@param要向用户显示的提示 */ 公共静态int readPositiveInteger(字符串提示) { int输入=0; 扫描仪扫描=新扫描仪(System.in); 布尔优先=假; 而(!scan.hasnetint()) { int数量=scan.nextInt(); 如果(数量>0) { 第一个=正确; 数量=scan.nextInt(); } 否则,如果(数量,java,loops,if-statement,methods,Java,Loops,If Statement,Methods,用于授权您的代码至少执行一次,然后询问用户是否希望再次计算结果 import java.util.Scanner; public class InteractiveRectangle { public static void main(String[] args) { int height = readPositiveInteger("Enter the height"); int width = readPositiveInteger(
import java.util.Scanner;
public class InteractiveRectangle
{
public static void main(String[] args)
{
int height = readPositiveInteger("Enter the height");
int width = readPositiveInteger("Enter the width");
printRectangleDetails(height, width);
}
/**
* Read in an integer and return its value
* @param the prompt to be shown to the user
*/
public static int readInteger(String prompt)
{
Scanner scan = new Scanner(System.in);
System.out.println(prompt);
while (!scan.hasNextInt()) // while non-integers are present...
{
scan.next(); //...read and discard input, then prompt again
System.out.println ("Bad input. Enter an integer");
}
int firstInteger = scan.nextInt();
return firstInteger;
}
/**
* Read in an integer greater than 0 and return its value
* @ param the prompt to be shown to the user
*/
public static int readPositiveInteger(String prompt)
{
int input = 0;
Scanner scan = new Scanner(System.in);
boolean first = false;
while (!scan.hasNextInt())
{
int quantity = scan.nextInt();
if (quantity > 0)
{
first = true;
quantity = scan.nextInt();
}
else if (quantity <= 0)
{
System.out.println("Bad input. Enter a positive integer.");
}
}
return input;
}
/**
* Returns the area of a rectangle
* @param height the height of the rectangle
* @param width the width of the rectangle
*/
public static int area (int height, int width)
{
return height * width;
}
/**
* Returns the perimeter of a retangle
* @param height the height of the rectangle
* @param width the width of the rectangle
*/
public static int perimeter (int height, int width)
{
return (height * 2) + (width * 2);
}
/**
* Prints the area, the perimeter, the length and the width
* @param heigth the height of the rectangle
* @param width the width of the rectangle
*/
public static void printRectangleDetails (int height, int width)
{
System.out.println("The height is " + height);
System.out.println("The width is " + width);
System.out.println("The area is " + area(height, width));
System.out.println("The perimeter is " + perimeter(height, width));
}
}
我假设您希望用户通过按enter确认每个输入。
使用
scan.nextInt()
时,将尝试读取输入中的下一个整数,并将此处讨论的所有其他内容保留在其中。我不喜欢跳过行中不是int的所有内容,而是读第一个int,因为“hello world number 5”不应该返回5
char ch = 'y';
do{
int height = readPositiveInteger("Enter the height");
int width = readPositiveInteger("Enter the width");
printRectangleDetails(height, width);
System.out.print("Do you want to calculate other rectangle (y/n) ? : ");
Scanner reader = new Scanner(System.in);
char = reader.next().charAt(0);
}while(ch=='y' || ch=='Y');
publicstaticint-readPositiveInteger(字符串提示){
int输入=0;
扫描仪扫描=新扫描仪(System.in);
while(输入
public static int readPositiveInteger(String prompt) {
int input = 0;
Scanner scan = new Scanner(System.in);
while (input <= 0) {
// ask for a number
System.out.println(prompt);
try { // read the number
input = scan.nextInt();
} catch (InputMismatchException e){ // catch if there is no number
input = 0;
} // read the remainder of the input line
scan.nextLine();
}
return input;
}
public static boolean anotherRound(){
Scanner scan = new Scanner(System.in);
System.out.println("Another Round?");
// read a full line
String input = scan.nextLine();
if("y".equals(input)){ // if "y" then true, else false
return true;
}
return false;
}
public static void main(String[] args) {
do {
int posInt = readPositiveInteger("Enter a positive integer");
System.out.println("You entered " + posInt);
} while (anotherRound());
}