[英]Java try-catch statement inside while loop
我有这种方法,它工作正常。 我需要放置一条try / catch语句,以便在用户输入字母时该方法可以继续。 我不知道该声明放在何处,似乎到处我都说错了。 有人可以告诉我该声明放在何处吗?
public void myMethod() {
Scanner in = new Scanner(System.in);
int array[] = new int[21];
int number;
boolean end = false;
while (!end) {
System.out.println("Please give an number between 0-20: ");
number = in.nextInt();
for (int i = 1; i < array.length; i++) {
if (i == number) {
System.out.println(array[number]);
end = true;
}
}
if (!end) {
System.out.println("I cant find number " + number
+ " in the array, please try again ");
}
}
}
System.out.println("Please give an number between 0-20: ");
try{
number = in.nextInt();
}catch(Exception e){
number = 1; //Put random number of default number here
}
public static void main(String[] args) {
Test test = new Test();
Scanner in = new Scanner(System.in);
int array[] = new int[21];
int number;
System.out.println("Please give an number between 0-20: ");
do{
try{
number = Integer.parseInt(in.next());
}
catch(Exception e){
System.out.println("Please give an number between 0-20: ");
number = -1;
}
}
while(!(number <= 20 && number >=0 ));
System.out.println(array[number]);
}
我无法解释您的for
循环,您只需要检查0到20之间的值,并且当您调用try catch时,必须在异常发生后跳过循环
public static void myMethod() {
Scanner in = new Scanner(System.in);
int array[] = new int[21];
int number=0;
boolean end = false;
while (!end) {
System.out.println("Please give an number between 0-20: ");
//check symbol
try{
number = Integer.valueOf(in.next());
}catch(Exception e)
{
System.out.println("It's not a number! ");
continue; //skip loop
}
if((number>=0)&&(number<=20))
{
System.out.println(array[number]);
end=true;
}
else
System.out.println("I cant find number " + number
+ " in the array, please try again ");
/* why do you use loop here???
* u need to check if number between 0-20
for (int i = 1; i < array.length; i++) {
if (i == number) {
System.out.println(array[number]);
end = true;
}
}*/
}
}
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