[英]Use java scanner at cmd
如何使用以下命令從cmd讀取數據
我使用了這種方法,直到到達用戶輸入並且調試器進入hasnext並掛起為止,它都可以正常工作
public String readCMD() {
try {
Scanner sc =new Scanner(in);
StringBuilder sb = new StringBuilder();
String ch ;
while (sc.hasNext()) {
ch = sc.next();
System.out.print(ch);
sb.append(ch);
}
return sb.toString();
} catch (Exception e) {
System.out.println(e.getCause());
}
return null;
}
嘗試這個
public String readCMD() {
try {
Scanner sc = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
String ch;
while (sc.hasNext()) {
ch = sc.next();
System.out.print(ch);
sb.append(ch);
}
return sb.toString();
} catch (Exception e) {
System.out.println(e.getCause());
}
return null;
}
嘗試使用nextLine()
:
while (!(ch = sc.nextLine()).equals("")) {
System.out.print(ch);
sb.append(ch);
}
這樣,您可以循環讀取,直到讀取空字符串為止。
您需要使用某種條件來中斷循環,在下面,如果用戶輸入“ exit”作為輸入,則它將中斷:
public String readCMD() {
try {
Scanner sc =new Scanner(in);
StringBuilder sb = new StringBuilder();
String ch ;
while (sc.hasNext()) {
ch = sc.next();
System.out.print(ch);
sb.append(ch);
if(ch.equals("exit")) {
break;
}
}
return sb.toString();
} catch (Exception e) {
System.out.println(e.getCause());
}
return null;
}
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