[英]Error with the try-catch statements
我需要修復try-catch語句的幫助,以便它將在第一次嘗試時處理異常。 目前,異常處理程序僅適用於第二個用戶輸入。 我為我的措辭不佳表示歉意。
class MyGradeLevels {
public static void main(String[] args) {
System.out.println("Please enter your grade to begin!");
java.util.Scanner input=new java.util.Scanner(System.in);
double grade=input.nextInt();
if ( grade >= 90 ) {
System.out.println("Great Job!");
} else if( grade <= 49 ) {
System.out.println("Needs Improvement!");
} else {
System.out.println("Average Effort!");
}
try {
grade=input.nextInt();
System.out.println("Your Final Grade is "+grade);
}
catch( java.util.InputMismatchException e ) {
System.out.println("Please round your number and restart!");
}
input.close();
}
}
您已經寫出了全部代碼。 要么更早開始“ try”,要么用完全相同的try catch包圍第一個輸入:
class MyGradeLevels {
public static void main(String[] args) {
System.out.println("Please enter your grade to begin!");
java.util.Scanner input=new java.util.Scanner(System.in);
double grade;
try {
grade=input.nextInt();
if ( grade >= 90 ) {
System.out.println("Great Job!");
} else if( grade <= 49 ) {
System.out.println("Needs Improvement!");
} else {
System.out.println("Average Effort!");
}
}
catch( java.util.InputMismatchException e ) {
System.out.println("Your number isn't right.");
}
try {
grade=input.nextInt();
System.out.println("Your Final Grade is "+grade);
}
catch( java.util.InputMismatchException e ) {
System.out.println("Please round your number and restart!");
}
input.close();
}
}
我想這就是您想要的,但是如果不說...
class MyGradeLevels {
public static void main(String[] args) {
System.out.println("Please enter your grade to begin!");
double grade = 0;
try {
java.util.Scanner input = new java.util.Scanner(System.in);
grade = input.nextInt();
} catch (java.util.InputMismatchException e) {
System.out.println("Please round your number and restart!");
}
if (grade >= 90) {
System.out.println("Great Job!");
} else if (grade <= 49) {
System.out.println("Needs Improvement!");
} else {
System.out.println("Average Effort!");
}
try {
java.util.Scanner input = new java.util.Scanner(System.in);
grade = input.nextInt();
System.out.println("Your Final Grade is " + grade);
input.close();
} catch (java.util.InputMismatchException e) {
System.out.println("Please round your number and restart!");
}
}
}
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