我试图询问用户是否想将另一个人添加到数组列表“list”中。我的想法是循环询问，然后将这些输入添加到数组“inf”中，然后将该数组放入数组列表中。现在，当我重复代码时，它只会删除以前的输入；我该如何制作它以便在每次迭代后添加到数组列表中？
public class test {
public static void main(String[] args) throws FileNotFoundException {
Scanner scan = new Scanner(System.in);
String ask = "no";
do {
System.out.println("Add? (yes/no)");
ask = scan.nextLine();
if (ask.equals("yes")){
//gather user info
System.out.println("Last Name: ");
String LastN = scan.nextLine();
System.out.println("First Name: ");
String FirstN = scan.nextLine();
System.out.println("# of Children:");
String Children = scan.nextLine();
System.out.println("Address:");
String Adr = scan.nextLine();
System.out.println("Phone #:");
String Pho = scan.nextLine();
Date dategather = new Date();
String Date = String.format("%tD", dategather);
//Input the data into an array
String[] inf = {LastN,FirstN,Children,Adr,Date,Pho};
ArrayList<String> list = new ArrayList<String>();
Collections.addAll(list,inf);
System.out.println(list);
}
} while (ask.equals("yes"));
}
}
最佳答案
您希望在 do-while 结构之外声明列表，并且如果您想打印每个行条目 - 那么您可以在 do- 的末尾执行此操作while结构:
//here you declare the list OUTSIDE:
ArrayList<String> list = new ArrayList<String>();
do {
System.out.println("Add? (yes/no)");
ask = scan.nextLine();
if (ask.equals("yes")){
//gather user info
System.out.println("Last Name: ");
String LastN = scan.nextLine();
System.out.println("First Name: ");
String FirstN = scan.nextLine();
System.out.println("# of Children:");
String Children = scan.nextLine();
System.out.println("Address:");
String Adr = scan.nextLine();
System.out.println("Phone #:");
String Pho = scan.nextLine();
Date dategather = new Date();
String Date = String.format("%tD", dategather);
//Input the data into an array
String[] inf = {LastN,FirstN,Children,Adr,Date,Pho};
Collections.addAll(list,inf);
//so here you want to display what the person just entered:
System.out.println("You Have Entered : \n Last Name: "+LastN+" First Name: "+FirstN+" Children : "+Children+" Address: "+Adr+" Date of Birth: "+Date+" Phone Number: "+Pho);
}
} while (ask.equals("yes"));
希望这对您有帮助。请尝试一下并告诉我。
关于java - 重复用户输入，同时将其添加到数组列表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37687429/