程序讀取異常后停止。需要一點幫助才能使其繼續(xù)到循環(huán)的開頭。我嘗試了 continue 語句，但它沒有用，或者可能是我的錯誤。package labexer5a;import java.util.*;public class LabExer5A { public static void main(String[] args) { int max = 50; int min = 1; int secretNumber; secretNumber = (int)(Math.random() * 49 + 1); Scanner keyboard = new Scanner(System.in); int guess; int count = 0; try{ do{ System.out.println("Guess a number from 1 to 50"); guess = keyboard.nextInt(); count ++; if(guess == secretNumber){ if(count> 1){ System.out.println("You got it in " + count + " attempt(s)"); } else{ System.out.println("You got it in " + count + " attempt"); } } else if(guess > max){ System.out.println("Out of Range"); } else if(guess < min){ System.out.println("Out of Range"); } else if(guess > secretNumber){ System.out.println("Too High. Try Again"); } else if(guess < secretNumber){ System.out.println("Too Low. Try Again"); } } while(guess != secretNumber); } catch(InputMismatchException e){ System.out.println("Invalid Input"); } } }
3 回答
心有法竹
TA貢獻(xiàn)1866條經(jīng)驗 獲得超5個贊
將 try/catch 移動到循環(huán)內(nèi)并將其放置在引發(fā)異常的特定代碼周圍。
do{
System.out.println("Guess a number from 1 to 50");
try {
guess = keyboard.nextInt();
} catch (InputMismatchException e){
System.out.println("Invalid Input");
keyboard.readLine();
continue;
}
count ++;
// rest of code
while(guess != secretNumber);
我不確定count當(dāng)你遇到異常時你想如何處理，如果你想計算每一次嘗試，即使是不正確的嘗試，然后count++在你從掃描儀讀取之前移動到。
至尊寶的傳說
TA貢獻(xiàn)1789條經(jīng)驗 獲得超10個贊
嘗試這個：
public class LabExer5A {
public static void main(String[] args) {
int max = 50;
int min = 1;
int secretNumber;
secretNumber = (int)(Math.random() * 49 + 1);
Scanner keyboard = new Scanner(System.in);
// you should initiate the value. If there is no exception, it would be replaced by the value read from console.
int guess = Integer.MAX_VALUE;
int count = 0;
do{
System.out.println("Guess a number from 1 to 50");
try {
guess = keyboard.nextInt();
} catch(InputMismatchException e){
System.out.println("Invalid Input");
// you should really read the input
keyboard.next();
count ++;
continue;
}
count ++;
if(guess == secretNumber){
if(count> 1){
System.out.println("You got it in " + count + " attempt(s)");
}
else{
System.out.println("You got it in " + count + " attempt");
}
}
else if(guess > max){
System.out.println("Out of Range");
}
else if(guess < min){
System.out.println("Out of Range");
}
else if(guess > secretNumber){
System.out.println("Too High. Try Again");
}
else if(guess < secretNumber){
System.out.println("Too Low. Try Again");
}
}
while(guess != secretNumber);
}
}
慕俠2389804
TA貢獻(xiàn)1719條經(jīng)驗 獲得超6個贊
package labexer5a; import java.util.*;
public class LabExer5A {
public static void main(String[] args) {
int max = 50;
int min = 1;
int secretNumber;
secretNumber = (int)(Math.random() * (max-1) + min);
Scanner keyboard = new Scanner(System.in);
int guess;
int count = 0;
do {
System.out.println("Guess a number from "+min+" to "+max);
try{
guess = keyboard.nextInt();
}
catch(InputMismatchException e){
System.out.println("Invalid Input");
continue;
} finally { // don't forget finally clause to increase count
count ++;
}
if(guess == secretNumber){
if(count> 1){
System.out.println("You got it in " + count + " attempt(s)");
}
else{
System.out.println("You got it in " + count + " attempt");
}
}
else if(guess > max){
System.out.println("Out of Range");
}
else if(guess < min){
System.out.println("Out of Range");
}
else if(guess > secretNumber){
System.out.println("Too High. Try Again");
}
else if(guess < secretNumber){
System.out.println("Too Low. Try Again");
}
}
while(guess != secretNumber);
}
}
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