Java扫描仪读取从键盘和存储在堆栈中的行

Question

我怎么能告诉我的代码停止录制时，当我按下键盘上的输入？

Scanner sc = new Scanner(System.in) ; 
Stack<String> stack = new Stack<String>() ; 
System.out.println("Enter sentence:"); 
    while (????) 
    { 
     stack.push(sc.next()) ; 
    } 

Answer 1

Scanner sc = new Scanner(System.in); 
Stack<String> stack = new Stack<String>() ; 
System.out.println("Enter sentence:"); 

sc = new Scanner(sc.nextLine()); 

while (sc.hasNext()) 
    stack.push(sc.next()); 

Answer 2

String input; 
while ( !(input = sc.nextLine()).equals("")) { 
    stack.push(input) ; 
}