Java 我必须让用户输入一个循环，直到输入“完成”
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时间：2020-08-13 02:58:07 来源:igfitidea点击:
I have to make a loop taking a users input until "done" is entered
提问by yoyo
I'm trying to make an ArrayListthat takes in multiple names that the user enters, until the word doneis inserted but I'm not really sure how. How to achieve that?
我正在尝试ArrayList使用用户输入的多个名称，直到done插入单词，但我不确定如何。如何做到这一点？
采纳答案by zbr
ArrayList<String> names = new ArrayList<String>();
String userInput;
Scanner scanner = new Scanner(System.in);
while (true) {
userInput = scanner.next();
if (userInput.equals("done")) {
break;
} else {
names.add(userInput);
}
}
scanner.close();
回答by Kent
String[] inputArray = new String[0];
do{
String input=getinput();//replace with custom input code
newInputArray=new String[inputArray.length+1];
for(int i=0; i<inputArray.length; i++){
newInputArray[i]=inputArray[i];
}
newInputArray[inputArray.length]=input
intputArray=newInputArray;
}while(!input.equals("done"));
untested code, take it with a grain of salt.
未经测试的代码，请谨慎对待。
回答by Elliott Frisch
I would probably do it like this -
我可能会这样做 -
public static void main(String[] args) {
System.out.println("Please enter names seperated by newline, or done to stop");
Scanner scanner = new Scanner(System.in); // Use a Scanner.
List<String> al = new ArrayList<String>(); // The list of names (String(s)).
String word; // The current line.
while (scanner.hasNextLine()) { // make sure there is a line.
word = scanner.nextLine(); // get the line.
if (word != null) { // make sure it isn't null.
word = word.trim(); // trim it.
if (word.equalsIgnoreCase("done")) { // check for done.
break; // End on "done".
}
al.add(word); // Add the line to the list.
} else {
break; // End on null.
}
}
System.out.println("The list contains - "); // Print the list.
for (String str : al) { // line
System.out.println(str); // by line.
}
}
回答by Sina
ArrayList<String> list = new ArrayList<String>();
String input = null;
while (!"done".equals(input)) {
// prompt the user to enter an input
System.out.print("Enter input: ");
// open up standard input
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
// read the input from the command-line; need to use try/catch with the
// readLine() method
try {
input = br.readLine();
} catch (IOException ioe) {
System.out.println("IO error trying to read input!");
System.exit(1);
}
if (!"done".equals(input) && !"".equals(input))
list.add(input);
}
System.out.println("list = " + list);
