使用jGRASP for Mac，我正在为java程序编写代码，首先要求用户输入一个整数[limitNumber]，然后计算1和[limitNumber]之间的奇数，并显示这些数字的总和显示值。在第一个方法运行之后，程序将询问用户是否希望再次使用新整数运行计算。
要继续，系统会提示用户输入1表示“是”，输入0表示“否”。如果输入了这些数字中的任何一个，程序运行正常，但我很难尝试合并另一个专注于1和0的try / catch，并为输入的任何其他值抛出异常消息。
代码如下：我试图找出的try / catch是在doAgain（）方法中
import java.util.Scanner; //PRE-WRITTEN CODE FROM SCANNER CLASS
public class sumOddsPetrantoni {
public static int limitNumber;
public static void main(String args[]) // MAIN METHOD USED TO CALL OTHER
// METHODS
{ //
getLimitNumber(); // USER INPUTS NUMBER TO BE USED AS MAX LIMIT
//
calcSumPrint(); // COMP CALCS ODD #S BETWEEN 1 AND LIMIT NUMBER
//
doAgain(); // ASKS USER IF THEY WANT TO REPEAT THE PROCESS
// YES: RETURNS TO getLimitNumber METHOD
// NO: TERMINATES PROGRAM
//
} // END OF MAIN METHOD
public static void getLimitNumber() {
boolean done = false;
Scanner input = new Scanner(System.in);
while (done != true) {
try {
System.out.print("Let's add some odd numbers!");
System.out
.print("\nPlease enter the limit number as an integer: ");
limitNumber = input.nextInt(); // METHOD USED TO INPUT INTEGER
done = true;
} // END - TRY SECTION
catch (Exception message) {
input.nextLine();
System.out.println("\nDo you know what an integerer is?");
System.out.println("The program threw a " + message
+ " message at me, NOT a real integer.");
System.out.println("Please try again.\n");
} // END - CATCH SECTION
} // END - WHILE LOOP
} // END - GET LIMIT NUMBER METHOD
public static void calcSumPrint() { // START - CALC SUM PRINT METOD
int sum = 0;
int ctr = 0;
for (ctr = 1; ctr <= limitNumber; ctr += 2)
// START - FOR LOOP
sum = sum + ctr;
{
System.out.println("\nThe sum of the odd numbers between 1 and "
+ limitNumber + " is " + sum + ".");
} // END - FOR LOOP
} // END - CALC SUM PRINT METHOD
public static void doAgain() { // START - DO AGAIN METHOD
int ans;
Scanner input = new Scanner(System.in);
System.out
.println("That was aewsome! \nWant to give it another shot? \n(1 to Continue, 0 to Quit): ");
ans = input.nextInt();
if (ans == 1) {
System.out.println("\nLet's rock and roll!");
getLimitNumber();
calcSumPrint();
doAgain();
}
if (ans == 0) {
System.out.println("Fine, I see how it is...");
}
} // END - DO AGAIN METHOD
}
答案 0 :(得分：0)
您可以在doAgain（）方法中执行以下操作：
throw new IllegalArgumentException(ans + " is not allowed value. Only 0 or 1 is allowed");
答案 1 :(得分：0)
为什么不使用else子句并重新启动方法？
if(ans == 1)
{
System.out.println("\nLet's rock and roll!");
getLimitNumber();
calcSumPrint();
doAgain();
}
else if(ans == 0)
{
System.out.println("Fine, I see how it is...");
}
else {
System.out.println("What you talkin bout, Willis");
doAgain();
}
答案 2 :(得分：0)
import java.util.InputMismatchException;
import java.util.Scanner; //PRE-WRITTEN CODE FROM SCANNER CLASS
public class sumOddsPetrantoni {
public static int limitNumber;
public static void main(String args[]) // MAIN METHOD USED TO CALL OTHER
// METHODS
{ //
getLimitNumber(); // USER INPUTS NUMBER TO BE USED AS MAX LIMIT
//
calcSumPrint(); // COMP CALCS ODD #S BETWEEN 1 AND LIMIT NUMBER
//
doAgain(); // ASKS USER IF THEY WANT TO REPEAT THE PROCESS
// YES: RETURNS TO getLimitNumber METHOD
// NO: TERMINATES PROGRAM
//
} // END OF MAIN METHOD
public static void getLimitNumber() {
boolean done = false;
Scanner input = new Scanner(System.in);
while (done != true) {
try {
System.out.print("Let's add some odd numbers!");
System.out
.print("\nPlease enter the limit number as an integer: ");
limitNumber = input.nextInt(); // METHOD USED TO INPUT INTEGER
done = true;
} // END - TRY SECTION
catch (Exception message) {
input.nextLine();
System.out.println("\nDo you know what an integerer is?");
System.out.println("The program threw a " + message
+ " message at me, NOT a real integer.");
System.out.println("Please try again.\n");
} // END - CATCH SECTION
} // END - WHILE LOOP
} // END - GET LIMIT NUMBER METHOD
public static void calcSumPrint() { // START - CALC SUM PRINT METOD
int sum = 0;
int ctr = 0;
for (ctr = 1; ctr <= limitNumber; ctr += 2)
// START - FOR LOOP
sum = sum + ctr;
{
System.out.println("\nThe sum of the odd numbers between 1 and "
+ limitNumber + " is " + sum + ".");
} // END - FOR LOOP
} // END - CALC SUM PRINT METHOD
public static int getInt(){
Scanner input = new Scanner(System.in);
int ans;
try {
ans = input.nextInt();
return ans;
}
catch(Exception e){
System.out.println("Try Again");
ans = getInt();
}
return ans;
}
public static void doAgain() { // START - DO AGAIN METHOD
int ans;
Scanner input = new Scanner(System.in);
System.out
.println("That was aewsome! \nWant to give it another shot? \n(1 to Continue, 0 to Quit): ");
ans = getInt();
if (ans == 1) {
System.out.println("\nLet's rock and roll!");
getLimitNumber();
calcSumPrint();
doAgain();
}
else if (ans == 0) {
System.out.println("Fine, I see how it is...");
}else{
throw new IllegalArgumentException("Oops! that's not fair input must be 0 or 1");
}
} // END - DO AGAIN METHOD
}
使用它来处理异常：）